CN108221911A - A kind of TGXG with Negative poisson's ratio and preparation method thereof - Google Patents
A kind of TGXG with Negative poisson's ratio and preparation method thereof Download PDFInfo
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- CN108221911A CN108221911A CN201810182644.5A CN201810182644A CN108221911A CN 108221911 A CN108221911 A CN 108221911A CN 201810182644 A CN201810182644 A CN 201810182644A CN 108221911 A CN108221911 A CN 108221911A
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- node
- tgxg
- ratio
- negative poisson
- grid rib
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 16
- 229920001903 high density polyethylene Polymers 0.000 claims description 6
- 239000004700 high-density polyethylene Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 21
- 210000003205 muscle Anatomy 0.000 abstract description 20
- 239000000463 material Substances 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 7
- 239000004927 clay Substances 0.000 abstract description 4
- 239000000945 filler Substances 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 3
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008092 positive effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D28/00—Producing nets or the like, e.g. meshes, lattices
Abstract
The invention discloses a kind of TGXG with Negative poisson's ratio and preparation method thereof, it solves the problems, such as that muscle material is drawn out easily in the prior art and causes Reinforced Material with Clay Engineering failure, muscle soil structure stability poor, Negative poisson's ratio, the interaction for improving muscle material and filler can be generated, the interlocking of node expansion increase muscle soil so that the pseudo-friction coefficient of ceramic-metal bond increases；The passive resistance of grid rib is increased, so as to enhance tall and big earth structure stability；Its technical solution is：Including grid rib and node sleeve, adjacent grid rib is spliced into reticular structure by node sleeve；The both ends of the grid rib have minor node, and the minor node of every four grid ribs, which is combined into one big node and passes through node sleeve, to be fixed；Minor node slides in node sleeve during external load function makes node sleeve expand deformation in thickness direction, generates negative poisson's ratio structure effect.
Description
Technical field
The present invention relates to field of civil engineering more particularly to a kind of TGXG and its preparation with Negative poisson's ratio
Method.
Background technology
In recent years, with the Large scale construction of China's infrastructure, extend in particular with traffic network to mountain area, it is tall and big
Earth structure is more and more (highly more than the tall and big barricade of 20m and roadbed etc.).Traffic load and natural cause (it is meteorological,
The hydrology, geology, earthquake etc.) under the action of, the disasters such as tall and big earth structure deformation, cracking even collapse happen occasionally, to people
People's lives and properties bring heavy losses.Research found with the increase of the depth of fill (burden pressure), shear stress between muscle soil
Increasing degree reduces, when banket increase to certain altitude when, the shear stress between muscle soil increases unobvious, illustrates tall and big reinforced earth
The friction coefficient of structure depth layers of reinforcement material than shallow-layer than reduce very much, increase the risk that muscle material is pulled out.There is above-mentioned phenomenon
It is primarily due to traditional TGXG and belongs to positive Poisson ratio material, when grid receives stretching action, grid is sent out in thickness direction
It is raw to shrink, the filler at muscle-Soil Interface is caused to cut contracting.
In existing research, in order to improve the mechanical property of reinforced earth, people change often through material intensity itself is improved
The stability of kind earthfill structure, and ignore the ceramic-metal bond action characteristic being had a major impact to Reinforced Material with Clay Engineering deformation and intensity
Improvement, this improved method for solve the problems, such as muscle material extract caused by Reinforced Material with Clay Engineering failure effect it is little.
Therefore, it is urgently to be resolved hurrily main in the design of tall and big earth structure for how improving the mechanical property of muscle-Soil Interface
One of problem.
Invention content
For overcome the deficiencies in the prior art, the present invention provides a kind of TGXG with Negative poisson's ratio and its
Preparation method, has the interaction for generating Negative poisson's ratio, improving muscle material and filler, and node expansion increase muscle soil is stung
Cooperation is used so that the pseudo-friction coefficient of ceramic-metal bond increases；The passive resistance of grid rib is increased, so as to enhance height greatly
The effect of muscle soil structure stability.
The present invention uses following technical proposals：
A kind of TGXG with Negative poisson's ratio, including grid rib and node sleeve, adjacent grid rib passes through section
Point sleeve is spliced into reticular structure；The both ends of the grid rib have minor node, and the minor node of every four grid ribs is combined into one
Big node simultaneously passes through node sleeve and fixes；Minor node slides in node sleeve during external load function makes node sleeve in thickness side
To deformation is expanded, negative poisson's ratio structure effect is generated.
Further, the minor node is in cone structure.
Further, the node sleeve is symmetrical structure, internal to have the cavity being adapted with trifle dot shape.
Further, the thickness of the node sleeve is less than the thickness of grid rib.
The preparation method of TGXG with Negative poisson's ratio, includes the following steps：
Step 1 determines the structure size of TGXG；
Step 2 prepares grid rib by raw material of high density polyethylene (HDPE)；
Grid rib is assembled into direction earthwork grille, and fix grid rib using node sleeve by step 3.
Further, it in the step 1, is determined according to determining TGXG structure size with negative poisson's ratio numerical relation
Trifle spot size.
Further, the grid rib thickness is 3~5mm, and grid rib width is 8~10mm, and each grid rib length is
45~55mm.
Further, the minor node length is 10~15mm, and minor node maximum gauge position dimension is 10~12mm.
Further, the node sleeve thickness is 2~3mm.
Further, in the step 2, grid rib is made through being plasticized using TGXG production equipment.
Compared with prior art, the beneficial effects of the invention are as follows：
Pass through node sleeve connection, when external load effect is less than certain numerical value, NPR geotechniques between the grid rib of the present invention
There is stretcher strain in grid, and based on movement of the node in sleeve, the movement of node is equivalent to one for the stretcher strain of grid
In the sliding of conical sleeve, therefore sliding of the node in sleeve can prop up sleeve cone, and sleeve is caused to be sent out in thickness direction
Raw dilatancy, so as to generate negative poisson's ratio structure effect；Node expansion energy increases the interlocking of muscle soil so that ceramic-metal bond
Pseudo-friction coefficient increase；Meanwhile the passive resistance of grid rib is also increased, so as to enhance the steady of tall and big earth structure
It is qualitative；
When external load effect is more than certain numerical value, conference is crossed in displacement of the node in sleeve to be caused on sleeve through-thickness
Moderate finite deformation occurs, sleeve is much larger than the resistance that node motion generates the elongation strain resistance of grid longitudinal rib itself, lattice at this time
Grid are deformed based on longitudinal rib elongation strain, positive effects of Poisson's ratio occur, but this positive Poisson's ratio deformation can bear Poisson early period with stress
It is offseted than deformation, therefore when NPR TGXG can ensure that overlying burden is larger, grid is not in integrally positive Poisson's ratio effect
Should, ceramic-metal bond is made to act on meet demand, is effectively prevented caused by causing muscle soil shear stress too small when the depth of fill is excessive
Grid extracts phenomenon from the soil body.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not form the improper restriction to the application for explaining the application.
Fig. 1 is the front view of the present invention；
Fig. 2 is the vertical view of the present invention；
Wherein, 1- minor nodes, 2- grid ribs, 3- node sleeves, the big nodes of 4-.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.It is unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
As background technology is introduced, muscle material exists in the prior art and is drawn out easily cause Reinforced Material with Clay Engineering failure, muscle soil
The poor deficiency of structural stability, the technical issues of in order to solve as above, present applicant proposes one kind to have Negative poisson's ratio
TGXG and preparation method thereof.
In a kind of typical embodiment of the application, as Figure 1-Figure 2, provide a kind of with Negative poisson's ratio
TGXG, by improving the joint structure of traditional TGXG, make it that can be expanded at node under tension, go out
Existing auxetic effect produces a kind of TGXG with negative poisson's ratio (Negative Poisson ' s Ratio, NPR) effect
(also referred to as NPR TGXG).
NPR TGXG includes multiple grid ribs 2 and node sleeve 3, and the end of every four grid ribs 2 passes through node sleeve
3 are spliced to form the reticular structure of transverse and longitudinal arrangement.
The both ends of the grid rib 2 have minor node 1, and the minor node 1 is in cone structure.
The node sleeve 3 is symmetrical structure, and the tool of node sleeve 3 is there are four openend, for connecting four grid ribs 2；
The inside of node sleeve 3 has the cavity being adapted with 1 centrum shape of minor node；The minor node 1 of every four grid ribs 2 passes through section
Point sleeve 3, which is fixed, forms a complete big node 4.
When external load effect (pulling force) is less than certain numerical value, there is stretcher strain in NPR TGXG, due to node sleeve
3 rigidity is slightly smaller compared with the intensity of grid rib 2, and therefore, the stretcher strain of NPR TGXG is with minor node 1 in node sleeve 3
Based on movement.
The movement of minor node 1 is equivalent to sliding of the cone in conical sleeve, therefore minor node 1 is in node sleeve 3
Sliding node sleeve 3 can be propped up, node sleeve 3 is caused to expand deformation in thickness direction, so as to generate negative poisson's ratio
Structure effect；Node expansion energy increases the interlocking of muscle soil so that the pseudo-friction coefficient of ceramic-metal bond increases；Meanwhile also increase
The big passive resistance of grid rib, so as to enhance the stability of tall and big earth structure.
When external load effect is more than certain numerical value, conference is crossed in displacement of the minor node 1 in node sleeve 3 leads to node sleeve
Moderate finite deformation occurs on 3 through-thickness, the resistance that node sleeve 3 generates the movement of minor node 1 at this time is much larger than grid rib 2 certainly
There is positive effects of Poisson's ratio based on 2 elongation strain of grid rib in the elongation strain resistance of body, NPR geogrid deformations.
But above-mentioned positive Poisson's ratio deformation can be deformed with stress negative poisson's ratio early period and be offseted；Therefore, NPR TGXG
When can ensure that overlying burden is larger, grid is not in integrally positive effects of Poisson's ratio, ceramic-metal bond is made to act on meet demand, effectively
It avoids grid caused by causing muscle soil shear stress too small when the depth of fill (overlying burden) is excessive and phenomenon is extracted from the soil body.
The auxetic effect of NPR TGXG can improve the interaction of muscle material and filler, additionally with excellent damping
Characteristic, when the depth of fill (burden pressure) increases, the interlock action between muscle soil increases or remains unchanged so that the structure
With stronger physics and mechanical characteristic；Safety problem to improve high fill wall body structure provides theoretical foundation and technology branch
It holds.
The preparation method of TGXG with Negative poisson's ratio, includes the following steps：
Step 1 has determining for Negative poisson's ratio grid node structure size：
NPR TGXG structure size can influence the size of node negative poisson's ratio numerical value, according to available data and grid
Size, 2 thickness of grid rib can use 3~5mm, and 2 width of grid rib is 8~10mm, and each 2 length of grid rib is 45~55mm.
Wherein, 2 both ends minor node of grid rib, 1 length can use 10~15mm, and since 1 shape of minor node is cone, cone is most
Big thickness is 10~12mm, and 3 thickness of node sleeve is 2~3mm, but should ensure that the thickness of node sleeve 3 is less than the thickness of grid rib 2
Degree.
The making of step 2NPR TGXG：
High density polyethylene (HDPE) is selected to prepare raw material, grid rib 2 is made through being plasticized using TGXG production equipment, utilizes
Assembled equipment is assembled as direction earthwork grille by grid rib 2, and is fixed grid rib 2 with node sleeve 3, and it is raw to carry out batch
Production.
The TGXG production equipment, assembled equipment are existing structure, and details are not described herein again.
The application range of NPR TGXG is：
Above-mentioned NPR TGXG can be used in the engineering for needing reinforced structure, such as build highway, railway and rivers
The protection works such as the longshore reinforced soil retaining wall in lake, dykes and dams, bridge floor, abrupt slope, mine engineering.
In the another embodiment of the application, a kind of preparation method of side slope NPR TGXG, side slope work are provided
Cheng Zhong, TGXG are mainly used for soil mass consolidation, prevent Slope Sliding, to prepare the NPR TGXG suitable for side slope, system
It is for step：
First, the maximum transversal deflection of side slope is estimated, according to the determining NPR grid sizes of experiment and negative poisson's ratio numerical value
Relationship determine node size；
Then, it is manufactured using TGXG production equipment through longitudinal rib, NPR geotechnique's lattice are made in the technique productions such as node assembly
Grid；
Finally, NPR TGXG is laid in side slope.
Mobile drive grid node motion occurs for grid rib, node sleeve is caused to exist when node slides in node sleeve
Thickness direction expands deformation, and so as to generate negative poisson's ratio structure effect, on the one hand node expansion increases the snap-in force of muscle soil,
On the other hand soil body lateral displacement resistance is increased, so as to which grid effectively be avoided to be extracted now from the soil body due to snap-in force reduces
As substantially increasing Side Slope Safety Coefficient.
The foregoing is merely the preferred embodiments of the application, are not limited to the application, for the skill of this field
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of TGXG with Negative poisson's ratio, which is characterized in that including grid rib and node sleeve, adjacent grid
Rib is spliced into reticular structure by node sleeve；The both ends of the grid rib have minor node, the minor node of every four grid ribs
It is combined into one big node and passes through node sleeve and fix；Minor node slides in node sleeve during external load function makes node sleeve
Deformation is expanded in thickness direction, generates negative poisson's ratio structure effect.
A kind of 2. TGXG with Negative poisson's ratio according to claim 1, which is characterized in that the minor node
In cone structure.
A kind of 3. TGXG with Negative poisson's ratio according to claim 2, which is characterized in that the node cover
Cylinder is symmetrical structure, internal to have the cavity being adapted with trifle dot shape.
A kind of 4. TGXG with Negative poisson's ratio according to claim 1, which is characterized in that the node cover
The thickness of cylinder is less than the thickness of grid rib.
5. according to the preparation method of any TGXG with Negative poisson's ratio of claim 1-4, feature exists
In including the following steps：
Step 1 determines the structure size of TGXG；
Step 2 prepares grid rib by raw material of high density polyethylene (HDPE)；
Grid rib is assembled into direction earthwork grille, and fix grid rib using node sleeve by step 3.
6. the preparation method of the TGXG according to claim 5 with Negative poisson's ratio, which is characterized in that described
In step 1, trifle spot size is determined according to determining TGXG structure size and negative poisson's ratio numerical relation.
7. the preparation method of the TGXG according to claim 5 with Negative poisson's ratio, which is characterized in that described
Grid rib thickness is 3~5mm, and grid rib width is 8~10mm, and each grid rib length is 45~55mm.
8. the preparation method of the TGXG according to claim 6 with Negative poisson's ratio, which is characterized in that described
Minor node length is 10~15mm, and minor node maximum gauge position dimension is 10~12mm.
9. the preparation method of the TGXG according to claim 5 with Negative poisson's ratio, which is characterized in that described
Node sleeve thickness is 2~3mm.
10. the preparation method of the TGXG according to claim 5 with Negative poisson's ratio, which is characterized in that institute
It states in step 2, grid rib is made through being plasticized using TGXG production equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810182644.5A CN108221911B (en) | 2018-03-06 | 2018-03-06 | Geogrid with negative poisson ratio effect and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810182644.5A CN108221911B (en) | 2018-03-06 | 2018-03-06 | Geogrid with negative poisson ratio effect and preparation method thereof |
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| CN108221911A true CN108221911A (en) | 2018-06-29 |
| CN108221911B CN108221911B (en) | 2024-01-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777700A (en) * | 2019-11-07 | 2020-02-11 | 湘潭大学 | Multistage energy consumption highway buffer stop |
| CN111969327A (en) * | 2020-08-21 | 2020-11-20 | 北京化工大学 | Deformation-designable and non-contact-controllable two-dimensional mechanical metamaterial |
| CN112229718A (en) * | 2020-09-30 | 2021-01-15 | 山东大学 | Method for determining transverse rib blocking force of smart geogrid in drawing process |
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| CN200971495Y (en) * | 2006-11-02 | 2007-11-07 | 金亚伟 | High strength integral earth grid |
| GB0816016D0 (en) * | 2007-09-04 | 2008-10-08 | Univ Malta | Systems with adjustable properties including negative poisson's ratios, negative compressibility and negative thermal expansion, including systems made |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111969327B (en) * | 2020-08-21 | 2021-10-15 | 北京化工大学 | Deformation-designable and non-contact-controllable two-dimensional mechanical metamaterial |
| CN112229718A (en) * | 2020-09-30 | 2021-01-15 | 山东大学 | Method for determining transverse rib blocking force of smart geogrid in drawing process |
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| CN108221911B (en) | 2024-01-12 |
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