Negative poisson's ratio structure filling retaining wall and construction method thereof

Abstract

The application discloses a kind of negative poisson's ratio structure filling retaining wall and its construction method, according to the section size of retaining wall, prepare a certain amount of negative poisson's ratio structure block, according to the order splicing installation, after every installation, it is engaged with fixed plate and is connected, and with the next negative poisson's ratio structure block, when all structure blocks are installed, the whole negative poisson's ratio structure block is fixed by the anchor rod and the baffle of roadway two sides, and the new filling retaining wall of integrality is formed by laying geotextile.The application uses negative poisson's ratio structure to make the retaining wall of filling body, this structure has special mechanical properties, compared with traditional materials, can bear greater pressure, high safety, good reliability, effective porosity of negative poisson's ratio structure is high, water filtering performance is good, can be combined with drain pipe to achieve better drainage effect, let filling body reach expected strength faster, the degree of modularity is high in construction process, easy to install, and material is light, cost is low, construction difficulty is low, time is short.

Description

TECHNICAL FIELD

[0001] The present application relates to mining filling technology, in particular to a negative Poisson's ratio structure filling retaining wall and a construction method thereof. BACKGROUND

[0002] When filling the mined-out area in the underground mine filling mining method, a large amount of filling slurry is transported to the mined-out area, but the drainage performance of the filling slurry is greatly affected due to the large amount of filling slurry deposited in the mined-out area. Due to the poor drainage performance, the filling body takes a longer time to reach the expected strength, and the final strength is also lower, which has a certain influence on the filling efficiency of the mine and the safety of the next stage of stoping. Therefore, how to timely drain the water in the filling material in the stope is a difficulty in the stope filling of the underground mine filling mining method.

[0003] At present, the filling retaining wall in the mine is basically poured with concrete. Although the process is simple, the concrete curing time is long, the installation is difficult, and the drainage effect of the filling body is poor. Nowadays, there are also block type filling retaining walls, which have high modularization degree, but the installation is relatively complex and takes a long time, and the strength of the retaining wall is difficult to guarantee. The production process of hollow bricks is complex, and it is difficult to use on the mine. There are also integrated flexible frame filling retaining walls, which are easy to produce and fit the shape of the roadway, but the construction process is complex, the technical requirement level is high, and the position of the retaining wall is required during installation. It is relatively difficult to achieve in production. In addition, there are also efficient dehydration recyclable modular alloy retaining walls and tailings drainage sealing wall retaining wall construction methods. The strength of the retaining wall is guaranteed, but the alloy retaining wall technology is complex, the cost is too high, the dehydration effect is poor, and it is difficult to be practical on the mine. The implementation process of the tailings drainage sealing wall is relatively difficult, and the applicability is also poor. SUMMARY

[0004] The technical problem solved by the present application is to provide a negative Poisson's ratio structure filling retaining wall and a construction method thereof to solve the problems of poor dehydration effect and difficult construction of the existing underground mine filling retaining wall.

[0005] The present application adopts the following technical solutions:

[0006] Firstly, the present application discloses a negative Poisson's ratio structure filling retaining wall, which is built with negative Poisson's ratio structure blocks in the stope communication passage of the butt joint filling area. The built filling retaining wall forms an arch surface towards the filling area. The filter pipe in the stope is pre-buried and arranged inside the filling retaining wall. The two sides of the filling retaining wall are anchored with the sidewall rock mass of the stope communication passage.

[0007] Further, in the negative Poisson's ratio structure filling retaining wall, the negative Poisson's ratio structure block is a trapezoidal section block, and the side walls of adjacent blocks are provided with tooth-shaped structures which are mutually wedged, and the negative Poisson's ratio structure blocks are tightly wedged by the special performance of lateral expansion under axial tension of the negative Poisson's ratio structure, and the negative Poisson's ratio structure block can adopt a rotating rectangular structure, an inner recess structure, a perforated plate structure and the like negative Poisson's ratio structure, and the material can be selected from PVC, POM, PET and the like materials with high strength, good toughness and low cost.

[0008] Further, in the negative Poisson's ratio structure filling retaining wall, the negative Poisson's ratio structure blocks in the same layer are mutually fixed by embedding fixed plates in the longitudinal direction, and the negative Poisson's ratio structure blocks in the height direction are mutually fixed by binding connecting pieces between layers, so that the filling retaining wall formed by the negative Poisson's ratio structure blocks is connected as a whole.

[0009] Further, in the negative Poisson's ratio structure filling retaining wall, the filling retaining wall after being built is anchored with the mine connecting passage by fixed anchor rods, and the gap between the filling retaining wall and the mine connecting passage is formed into an integral structure connected with the mine rock mass by filling pouring.

[0010] Further, in the negative Poisson's ratio structure filling retaining wall, at least one layer of geotextile is laid on the arch surface of the filling retaining wall facing the filling area, so as to prevent the slurry in the filling area from penetrating out of the mine through the negative Poisson's ratio structure block pores of the filling retaining wall.

[0011] The application further discloses a construction method of the negative Poisson's ratio structure filling retaining wall.

[0012] Step one: after the mine is mined, the arrangement position of the filling retaining wall is determined at the mine connecting passage connecting passage of the upper and lower parts of the mine, the area is leveled, and the roadway of the connecting passage is trimmed into a regular cross section;

[0013] Step two: the size of the determined position roadway and the filling body pressure to be borne are determined, the size of the built filling retaining wall, the required number of negative Poisson's ratio structure blocks and the shape of the structure blocks at the corners are determined, the negative Poisson's ratio structure blocks are made according to the determined size of the filling retaining wall and the number of negative Poisson's ratio structure blocks, each negative Poisson's ratio structure block is marked and transported to the position determined in step one;

[0014] Step three: the fixed anchor rods are punched into the roadway walls on both sides of the position determined in step one, the built position of the filling retaining wall is calibrated, and the anchor rods are used for anchoring the filling retaining wall;

[0015] Step four: the filling retaining wall is built by the marking of the negative Poisson's ratio structure blocks in step two, the mine water filtering pipeline is preset in the filling retaining wall during the building process, and the geotextile is laid on the side of the filling retaining wall facing the goaf.

[0016] Step five: after the filling retaining wall is completed, grouting is performed on the gap around the completed filling retaining wall, and then a baffle is inserted between the filling retaining wall and the anchor rod pre-set in step three, so that the completed filling retaining wall and the roadway inner wall rock become a complete retaining wall structure.

[0017] Further, in the construction method of the negative Poisson's ratio structure filling retaining wall, in step one, the selected mine connecting passage is smooth blasted and the lining is smoothed when the roadway is excavated, so that the roadway is more smooth, or the roadway is smoothed by spraying concrete and manual finishing, so as to facilitate the stacking of the structural blocks.

[0018] Further, in the construction method of the negative Poisson's ratio structure filling retaining wall, in step two, the negative Poisson's ratio structure block is a trapezoidal block, and a tooth-shaped structure is processed on the joint surface of adjacent negative Poisson's ratio structure blocks, and the filling retaining wall after being built forms an arch surface towards the filling area.

[0019] Further, in the construction method of the negative Poisson's ratio structure filling retaining wall, in step four, the negative Poisson's ratio structure blocks are laid layer by layer along the longitudinal direction for stacking, and a binding connector is used at the corner of each layer of negative Poisson's ratio structure blocks to connect each layer of negative Poisson's ratio structure blocks into a whole, and a fixed plate is embedded between two adjacent negative Poisson's ratio structure blocks in the same layer for mutual fixation.

[0020] Further, in the construction method of the negative Poisson's ratio structure filling retaining wall, in step four, during the process of building the negative Poisson's ratio structure blocks, the geotextile is laid before the last column of longitudinal negative Poisson's ratio structure blocks is installed, or the geotextile of the corresponding area is installed after each column of longitudinal negative Poisson's ratio structure blocks is installed.

[0021] The application uses negative Poisson's ratio structure blocks to build the goaf filling retaining wall, and utilizes the special mechanical properties of the negative Poisson's ratio structure, which shrinks laterally when axially compressed and expands laterally when axially stretched, so that the filling retaining wall has more advantages than traditional materials in terms of shear bearing capacity, fracture resistance, energy absorption and pressure resistance, etc. A part of lateral pressure is released through the deformation of the negative Poisson's ratio, which also supports the mine roof and reduces the deformation redundancy of the filling body caused by blasting vibration. The safety is high, the reliability is good, the material cost is low, and the economy is good. On the other hand, the negative Poisson's ratio structure has high modularity, light material and easy installation, and can reach the required strength of the filling retaining wall in a short time, optimizing the filling process and improving the efficiency of ore production. The negative Poisson's ratio structure has high porosity, good water filtration performance, and can also filter out the internal water in a shorter time and reach the expected strength, which not only ensures the filling efficiency of the mine, but also ensures the safety of the next stage of mining.

[0022] The application provides a construction method of a portable high-strength negative Poisson's ratio structure filling retaining wall for a negative Poisson's ratio structure block, a certain number of negative Poisson's ratio structure blocks are prepared according to the section size of the retaining wall, and are sequentially spliced and arranged, after arranging a row, the negative Poisson's ratio structure blocks are fixed and connected in the longitudinal direction by a fixing plate and are connected with adjacent negative Poisson's ratio structure blocks, when all the negative Poisson's ratio structure blocks are arranged, the negative Poisson's ratio structure blocks are fixed as a whole by using the anchor rods and the retaining plates on the two sides of the roadway, and geotextile is laid to form the novel filling retaining wall. The whole construction process is simple in steps, low in manufacturing cost and high in modular degree, the strength required by the filling retaining wall can be achieved in a short time, the water filtering effect is good, and the filling efficiency of the stope can be greatly improved.

[0023] Compared with other filling retaining wall construction methods, the negative Poisson's ratio structure filling retaining wall and the construction method thereof have the following advantages: (1) the filling retaining wall is high in strength, high in modular degree, easy to install and capable of playing a role of the filling retaining wall in a short time; (2) the construction is simple, the materials are easy to obtain, and the manufacturing cost is low; (3) the water filtering effect is good, the strength required by the filling retaining wall can be achieved in a short time, the dehydration efficiency of the filling material of the stope is greatly improved, and the filling efficiency and the production efficiency are improved; and (4) the applicability is wide, and the negative Poisson's ratio structure filling retaining wall can be widely applied to various filling mining methods.

[0024] In summary, the negative Poisson's ratio structure filling retaining wall has special mechanical properties, can bear greater pressure than traditional materials, is high in safety and good in reliability, guarantees the stability of the filling body, is high in modular degree in the construction process, easy to install, light in material, low in cost, low in construction difficulty, short in time consumption, can be applied to various underground filling mining methods and has wide applicability.

[0025] The application will be further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a top view of the negative Poisson's ratio structure filling retaining wall in the embodiment.

[0027] Figure 2 It is a side view of the negative Poisson's ratio structure filling retaining wall in the embodiment.

[0028] Figure 3 It is a front view of the negative Poisson's ratio structure filling retaining wall in the embodiment.

[0029] Figures 4-7 It is a schematic view of the construction steps of the negative Poisson's ratio structure filling retaining wall in the embodiment.

[0030] Figure 8 It is a schematic view of the tooth-shaped structure wedged between the negative Poisson's ratio structure blocks in the embodiment.

[0031] Figure 9 Schematic diagram of setting fixed plate for negative Poisson's ratio structure block in the embodiment.

[0032] Figure 10 Schematic diagram of setting fixed plate for negative Poisson's ratio structure block in the embodiment.

[0033] Figure 11 Schematic diagram of setting fixed plate for negative Poisson's ratio structure block in the embodiment.

[0034] Reference signs in the figure: 1 - filling body, 2 - negative Poisson's ratio filling retaining wall, 3 - geotextile, 4 - mine roadway connecting passage, 5 - negative Poisson's ratio structure block, 6 - fixed anchor rod, 7 - fixed plate, 8 - water filtering pipeline, 9 - baffle, 10 - binding connector. DETAILED DESCRIPTION

[0035] EMBODIMENT

[0036] Reference Figures 1-3 , the negative Poisson's ratio structure filling retaining wall 2 constructed in the underground mine in the figure is one specific embodiment of the application, as shown in the figure, the negative Poisson's ratio structure filling retaining wall 2 is built in the mine roadway connecting passage 4 of the butt joint filling area by using the negative Poisson's ratio structure block 5, the built negative Poisson's ratio structure filling retaining wall 2 forms an outer arch surface towards the filling area, realizes the surrounding retaining of the filling area, forms the "arch dam" of the filling body 1 after the grouting filling of the goaf, the two sides of the negative Poisson's ratio structure filling retaining wall 2 are anchored with the sidewall rock mass of the mine roadway connecting passage, so as to ensure the stability and reliability of the retaining wall, the water filtering pipeline 8 in the mine is pre-buried in the inside central part of the negative Poisson's ratio structure filling retaining wall 2, so as to filter out the water in other positions of the mine. Two layers of geotextiles 3 are laid on the arch surface of the negative Poisson's ratio structure filling retaining wall 2 towards the filling area, so as to prevent the slurry in the filling area from penetrating out of the mine through the negative Poisson's ratio structure block pores of the filling retaining wall.

[0037] The negative Poisson's ratio filling retaining wall 2 of the embodiment is connected with the rock wall of the roadway as a whole, in the inside of the filling retaining wall, the negative Poisson's ratio structure blocks 5 are stacked layer by layer, the block side surfaces of the adjacent negative Poisson's ratio structure blocks 5 are provided with interlocked tooth-shaped structures, the negative Poisson's ratio structure blocks 5 are tightly wedged by relying on the special performance of lateral expansion when the negative Poisson's ratio structure is axially tensioned, the negative Poisson's ratio structure blocks 5 in the same layer are embedded with the fixed plates 7 in the longitudinal direction for supplementary fixing, the negative Poisson's ratio structure blocks 5 built in the height direction are fixed with each other through the binding connectors 10 between the layers, so as to connect the filling retaining wall built by the negative Poisson's ratio structure blocks as a whole.

[0038] The two ends of the negative Poisson's ratio filling retaining wall 2 after masonry are anchored to the rock wall of the mine connecting passage 4 through fixed anchor rods 6, and the gap between the negative Poisson's ratio filling retaining wall 2 and the mine connecting passage 4 is filled and poured to form an integral structure connected with the rock mass of the mine.

[0039] In combination with reference to Figures 4-7 , the specific construction process of the negative Poisson's ratio structure filling retaining wall 2 of the embodiment is described in detail.

[0040] Step one: After the mining of the mine is completed, the arrangement position of the filling retaining wall is determined at the mine connecting passage of the upper and lower parts of the mine, and in the selected mine connecting passage, smooth blasting and masonry leveling are considered during the tunneling to make the tunnel more smooth, the tunnel of the connecting passage is trimmed into a regular cross section, and the tunnel can also be leveled by prying loose the loosened stones, manually spraying concrete, and manually trimming to facilitate the stacking of the filling retaining wall structure blocks.

[0041] Step two: according to the size of the determined position tunnel and the filling body pressure to be borne, the overall size of the masonry filling retaining wall is first determined, including width, thickness and height, the filling retaining wall is divided into a plurality of structure blocks according to the structure shape of the filling retaining wall, the number of structure blocks and the shape of the corner structure blocks of the filling retaining wall are determined, then the negative Poisson's ratio structure blocks are made according to the determined size of the filling retaining wall and the number of negative Poisson's ratio structure blocks, and each negative Poisson's ratio structure block is marked and transported to the position determined in step one. The negative Poisson's ratio structure block can adopt a negative Poisson's ratio structure such as a rotating rectangular structure, a concave structure, and a perforated plate structure, and the material can be selected from PVC, POM, PET and other materials with high strength, good toughness and low cost

[0042] The negative Poisson's ratio filling retaining wall in the embodiment is similar to an arch dam structure, the whole is an arch wall with the arch surface facing the filling area and the lower part being wide and the upper part being narrow, most of the negative Poisson's ratio structure blocks 5 are designed as similar cuboid blocks, the size is 0.8m x 0.5m x 0.4m long x wide x high, the length direction of the two sides is set with a deviation value, forming a trapezoidal cross section, which is convenient for splicing into an arch-shaped wall. The negative Poisson's ratio structure block 5 is two structures that can wedge each other, as shown in Figure 8 The side walls of the adjacent negative Poisson's ratio structure blocks 5 are provided with tooth-shaped structures that wedge each other, and the negative Poisson's ratio structure blocks are tightly wedged by the special performance of lateral expansion when the negative Poisson's ratio structure is axially tensioned, so as to realize the stability of the splicing between the adjacent negative Poisson's ratio structure blocks.

[0043] Step three: fixed anchor rods 6 are punched into the sidewall of the tunnel at the position determined in step one, which is used for anchoring the filling retaining wall.

[0044] Three fixed anchor rods 6 are punched into the rock wall of the roadway on both sides, each anchor rod has a total length of 0.7 m, the anchor rod punched into the rock wall has a depth of 0.5 m, and the exposed 0.2 m anchor rod is restricted and fixed to the filling retaining wall by the baffle 9 clamped between the fixed anchor rod 6 and the filling retaining wall. The length and depth of the fixed anchor rod 6 punched into the rock wall can be adjusted according to the lithology and integrity coefficient.

[0045] Step four: build the negative Poisson's ratio filling retaining wall 2 by marking the negative Poisson's ratio structure block in step two, and preset the stope water filtering pipeline 8 in the filling retaining wall during the building process, as shown in Figures 4-7 , and lay the geotextile 3 on the side of the filling retaining wall facing the goaf.

[0046] During the process of stacking the negative Poisson's ratio filling retaining wall, the negative Poisson's ratio structure block 5 is laid layer by layer in the longitudinal direction at the preset position of the wall, and the binding connector 10 should be used at the corners of each layer to tightly connect the layers, as shown in Figure 10 , the binding connector 10 uses a strap or a wire; and the two adjacent longitudinal negative Poisson's ratio structure blocks 5 need to be embedded with a fixed plate 7 to supplement the fixation of the adjacent structure blocks, as shown in Figure 9 , because the connection between the negative Poisson's ratio structure blocks 5 in the vertical direction through the tooth-shaped structure wedge is easy to be damaged under large stress, the connection between them needs to be strengthened by the fixed plate 7, and the fixed plate 7 can be made of wood or other hard material plate; during the stacking process, attention should be paid to reserving the water filtering pipeline 8 in the center, and the water filtering pipeline 8 needs to penetrate through the entire stope to filter out the water from other positions in the stope; because the negative Poisson's ratio structure block 5 has a certain porosity, two layers of geotextile 3 need to be installed on the side of the arch-shaped wall near the stope to prevent the slurry in the filling area from overflowing through the pores of the structure block, the geotextile 3 can be installed before the last column of longitudinal negative Poisson's ratio structure blocks is installed, or the geotextile in the corresponding area can be installed after each column of longitudinal negative Poisson's ratio structure blocks is installed.

[0047] Step five: after the filling retaining wall is stacked, grouting is performed on the gaps around the stacked filling retaining wall, when grouting is performed on the gaps around the stacked negative Poisson's ratio filling retaining wall 2, the gaps need to be filled to make the filling retaining wall become a complete wall structure and prevent it from cracking along the gaps, then the baffle is clamped between the filling retaining wall and the fixed anchor rod 6 preset in step three, so that the resistance of the fixed anchor rod 6 to the wall is more uniform, and the stacked filling retaining wall and the rock mass in the roadway become a complete wall structure. The baffle 9 can be made of hard wood or metal plate, and the size is 3 m x 0.15 m x 0.05 m selected according to the size of the filling retaining wall of the embodiment.

[0048] After grouting around the negative Poisson's ratio filling retaining wall 2 reaches the stress intensity that can support the filling material in the entire stope filling area, the filling can be performed, as shown in Figure 11 .

[0049] From the above, the construction process of the embodiment mainly has the following three parts:

[0050] ①Before the goaf is filled, the site where the masonry filling retaining wall is determined is leveled, the roadway is trimmed into a regular cross section, or the roadway is sprayed with shotcrete by workers to form a regular shape.

[0051] ②The number of negative Poisson's ratio blocks and the shape of the blocks at the corners are determined and made, and then the blocks are transported to the roadway and installed in the roadway.

[0052] ③Before the retaining wall is installed, fixed anchor rods are drilled on both sides, and then the negative Poisson's ratio blocks are installed by using the structural characteristics of the blocks, the blocks are fixed by using binding connectors, the blocks are fixed to each other by using fixed plates between the blocks, a filter pipe is arranged in the center of the retaining wall, and the filling is performed after the negative Poisson's ratio filling retaining wall is installed.

[0053] The actual technical requirements of the above construction process are as follows:

[0054] ①When the roadway is leveled, shotcrete, manual trimming, smooth blasting during roadway excavation, and masonry leveling can be used to make the roadway as smooth as possible to facilitate the stacking of the blocks.

[0055] ②The number of negative Poisson's ratio blocks and the shape of the blocks at the corners are determined according to the size of the roadway at the position of the retaining wall and the pressure of the filling body that needs to be borne.

[0056] ③A plurality of fixed anchor rods are drilled in the roadway rock wall on both sides of the roadway at the position of the retaining wall to determine the position of the negative Poisson's ratio filling retaining wall and meet the needs of subsequent fixing operations; the negative Poisson's ratio blocks are stacked, and the blocks are fixed by using binding connectors; the blocks are fixed to each other by using fixed plates between the blocks; two layers of geotextiles are arranged on one side of the negative Poisson's ratio filling retaining wall; the geotextiles can be installed before the installation of the last column of longitudinal negative Poisson's ratio blocks, or the geotextiles can be installed after the installation of each column of longitudinal negative Poisson's ratio blocks; after the negative Poisson's ratio filling retaining wall is stacked, wooden or iron plates are inserted between the retaining wall and the anchor rods; after the above procedures are completed, the gaps in the negative Poisson's ratio filling retaining wall are grouted and filled to form a complete retaining wall structure.

[0057] The above is only used to illustrate the technical solutions of the present application, but not limit the present application. Other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered in the scope of the claims of the present application.

Claims

1. A construction method for a negative Poisson's ratio infill retaining wall, characterized in that... Includes the following steps: Step 1: After the mining is completed, determine the location of the backfill retaining wall at the connecting passage between the upper and lower parts of the mining area, level the site in this area, and shape the roadway of the connecting passage into a regular cross-section. Step 2: Based on the size of the tunnel at the determined location and the pressure of the filling material to be borne, determine the size of the masonry retaining wall, the number of negative Poisson's ratio structural blocks required, and the shape of the structural blocks at the corners. Make negative Poisson's ratio structural blocks according to the determined size of the retaining wall and the number of negative Poisson's ratio structural blocks. Mark each negative Poisson's ratio structural block and transport it to the location determined in Step 1. Step 3: Drive fixed anchor bolts into the tunnel walls on both sides at the locations determined in Step 1. This marks the location for the filling retaining wall construction and also serves to anchor the filling retaining wall. Step 4: Construct a filling retaining wall by marking the negative Poisson's ratio structural blocks in Step 2. During the construction process, pre-install a mining area filter pipe inside the filling retaining wall and lay geotextile on the side of the filling retaining wall facing the goaf. Step 5: After the filling retaining wall is completed, grout is injected to fill the gaps around the completed filling retaining wall. Then, the baffle is inserted between the filling retaining wall and the anchor rod preset in Step 3, so that the completed filling retaining wall and the inner wall rock mass of the tunnel become a complete retaining wall structure.

2. The construction method of a negative Poisson's ratio structure filling retaining wall according to claim 1, in step one, the selected mining connecting roadway is smoothed by blasting and masonry leveling during roadway excavation, or by shotcreting and manual finishing to level the roadway, so as to facilitate the stacking of structural blocks.

3. The construction method of a negative Poisson's ratio structure filling retaining wall according to claim 1, wherein in step two, the negative Poisson's ratio structure block is a trapezoidal cross-section block, and a toothed structure that wedges with each other is processed on the splicing surface of adjacent negative Poisson's ratio structure blocks, and the filled retaining wall after masonry forms an arched surface facing the filling area.

4. In the construction method of a negative Poisson's ratio structure filling retaining wall according to claim 1, in step four, negative Poisson's ratio structural blocks are laid layer by layer along the longitudinal direction and stacked. At the corners of each layer of negative Poisson's ratio structural blocks, binding connectors are used to connect each layer of negative Poisson's ratio structural blocks into a whole. Fixing plates are embedded between adjacent negative Poisson's ratio structural blocks in the same layer for mutual fixation within the layer.

5. In the construction method of a negative Poisson's ratio structure filling retaining wall according to claim 1, in step four, during the process of building the negative Poisson's ratio structural blocks, when installing geotextile on the retaining wall surface near the mining area, the geotextile is laid before the last column of longitudinal negative Poisson's ratio structural blocks are installed, or the geotextile in the corresponding area is installed after each column of longitudinal negative Poisson's ratio structural blocks is installed.

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