A flexible reinforced retaining wall permeability test device

Abstract

This invention discloses a permeability testing device for flexible reinforced retaining walls, belonging to the technical field of permeability testing for retaining wall materials. It includes a support frame with a slide rail. Several sliders are slidably connected to the slide rail, and each slider has a detachable mounting plate fixedly connected to it. A first sponge strip is fixedly connected to one side of each mounting plate. A rectangular water guide plate is fixedly connected to the lower side of the mounting plate, located below the first sponge strip, with the side of the first sponge strip away from the mounting plate protruding from the water guide plate. Detachable side plates are fixedly connected to both ends of the mounting plate, and second sponge strips are fixedly connected to the outer surface of the side plates. This invention provides a permeability testing device adapted to the characteristics of flexible reinforced retaining walls, allowing for flexible application, layered testing, and precise local verification. There is an urgent need to develop corresponding testing equipment to address the technical shortcomings of low accuracy, limited dimensions, and lack of refined traceability in the testing of permeability performance of new materials.

Description

Technical Field

[0001] This invention belongs to the field of permeability testing technology for retaining wall materials, and particularly relates to a permeability testing device for flexible reinforced retaining walls. Background Technology

[0002] With the iterative upgrading of geotechnical engineering materials technology, flexible reinforced retaining walls have emerged in the industry. These walls are constructed by combining reinforcing materials such as geogrids and geotextiles with permeable fillers, and using perforated or semi-permeable wall modules. Based on the type of wall material, they can be classified into reinforced walls with graded crushed stone / gravel fillers, reinforced walls with sandy soil fillers, reinforced walls with improved soil fillers, reinforced walls with recycled aggregate fillers, and reinforced walls with EPS or porous lightweight concrete. These walls can reach heights of over 20 meters, deformation ranges of over 30 centimeters, and exhibit strong vibration and impact absorption capabilities and good long-term stability under large deformations. Flexible retaining walls differ from traditional rigid concrete retaining walls; the permeability coefficient of the wall itself is generally not less than 10. -4 With a permeability coefficient of cm / s, the flexible reinforced permeable wall possesses planar permeability, allowing water to seep out from the entire wall surface. This results in a short drainage path and high drainage efficiency. Furthermore, the soil behind the wall remains in a natural state for an extended period. Therefore, the hydraulic parameters of the flexible reinforced permeable wall, such as the permeability coefficient, permeability retention rate, and drainage per unit area, are core parameters characterizing the material's drainage properties, structural stability, and long-term impermeability durability, directly determining the reliability and service life of the new wall material. Thus, conducting refined, layered, and localized permeability performance testing on flexible reinforced retaining walls is a crucial experimental step in performance calibration, wall material formulation optimization, design method rationality verification, and process adaptability improvement. However, existing technologies and engineering practices show that the drainage performance of flexible reinforced permeable walls is not static. During long-term service, the permeability gradually decreases due to factors such as the loss and migration of fine particles from the backfill material, clogging of the filter layer, and the growth of biofilm. When the permeability coefficient drops to 10... -5 When the pressure is below cm / s, the soil behind the wall will change from its natural state to a saturated state, and the water level behind the wall will rise accordingly, causing the soil behind the wall to soften and become saturated. The active earth pressure will surge, resulting in a sharp decrease in the anti-sliding and anti-overturning coefficients, which seriously threatens the stability of the retaining wall.

[0003] Currently, the permeability testing equipment for flexible reinforced retaining walls still uses the traditional rigid wall testing structure, which has significant technical adaptation defects and cannot meet the testing needs of new materials.

[0004] Firstly, the surface of a flexible reinforced retaining wall is not a standard rigid plane after it is formed. The surface has natural micro-undulations and undulating features. Conventional testing equipment uses a rigid water intake docking structure, which cannot be fully fitted to the uneven wall surface of the new material. This easily creates docking gaps, making it difficult to accurately and comprehensively collect the water that seeps out from the surface of the flexible reinforced retaining wall. This frequently leads to problems of water seepage and leakage, resulting in a dispersion of the drainage per unit area of ​​the flexible reinforced retaining wall. Consequently, core testing parameters such as the permeability coefficient are distorted, and the true permeability performance of the flexible reinforced retaining wall cannot be accurately reflected.

[0005] Secondly, flexible reinforced retaining walls often employ a layered filling and layered curing construction process. The material density and porosity vary at different filling layer heights, resulting in significant gradient differences in permeability along the vertical height. However, existing testing equipment is a fixed, monolithic structure with no adjustable testing height. It can only provide a general assessment of the overall permeability of the wall, failing to perform layered permeability testing on the layered filling structure of flexible reinforced retaining walls. This prevents the acquisition of permeability parameters for flexible reinforced retaining walls at different layer heights and hinders the precise analysis of the differences in permeability between layers. This severely restricts the optimization of the structural mix and improvement of the forming process for flexible reinforced retaining walls.

[0006] Thirdly, during the material laying, compaction, and forming process of flexible reinforced retaining walls, problems such as uneven local porosity, insufficient compaction, and forming defects are prone to occur, leading to abnormal local water permeability in the wall. This is a key focus of performance testing and quality verification for flexible reinforced retaining walls. However, existing technologies are often limited to indoor permeability tests of wall materials or point observations of flow rate from single drainage holes. They cannot perform isolated testing of individual areas of the wall. During testing, seepage from adjacent areas interferes with each other, making it difficult to accurately distinguish between the overall permeability characteristics of the wall and local permeability defects. It is also difficult to accurately locate weak areas in the wall's performance, failing to meet the testing requirements for refined performance testing, defect tracing, and design optimization of retaining walls.

[0007] Chinese utility model patent CN224066185U discloses a slope seepage flow measurement device, which uses a flexible water-collecting tarpaulin combined with sealing mortar to adhere to the slope surface to collect seepage, enabling the observation of single-point seepage flow on soil and rock slopes. However, this solution is designed for natural soil and rock slopes and does not disclose a sealing structure adapted to perforated semi-permeable wall modules. When facing the perforated wall surface of flexible reinforced retaining walls, seepage is prone to lateral escape. The device is a single-point integral water collection structure and does not set up vertically layered modular water collection units or mutually isolated sub-detection chambers. It cannot obtain layered permeability parameters along the height of the wall, nor can it isolate seepage crosstalk between adjacent areas or locate local permeability defects. At the same time, the mortar-adhesive fixing method is not conducive to on-site operations on tall vertical retaining walls, making it difficult to meet the requirements of refined, layered, and localized in-situ permeability detection for flexible reinforced retaining walls.

[0008] In summary, there is currently a lack of permeability testing devices that are adapted to the drainage characteristics of flexible reinforced retaining walls, can be flexibly fitted, can be tested in layers, and can be accurately verified locally. There is an urgent need to develop corresponding testing equipment to solve the technical shortcomings of low accuracy, single dimension, and inability to trace the permeability performance of flexible reinforced retaining walls. Summary of the Invention

[0009] To address the problems existing in the prior art, this invention provides a permeability testing device for flexible reinforced retaining walls. This permeability testing device is adapted to the characteristics of flexible reinforced retaining walls, can be flexibly fitted, can be tested in layers, and can be accurately verified locally. There is an urgent need to develop corresponding testing equipment to solve the technical shortcomings of low accuracy, single dimension, and inability to finely trace the permeability performance of new materials.

[0010] This invention is implemented as follows: a permeability testing device for a flexible reinforced retaining wall includes a support frame, a slide rail on the support frame, a plurality of sliders slidably connected to the slide rail, and a detachable mounting plate fixedly connected to each slider. A first sponge strip is fixedly connected to one side of the mounting plate; a rectangular water guide plate is fixedly connected to the lower side of the mounting plate, the water guide plate is located below the first sponge strip, and the side of the first sponge strip away from the mounting plate protrudes from the water guide plate; detachable side plates are fixedly connected to both ends of the mounting plate, and a second sponge strip is fixedly connected to the outer surface of the side plate.

[0011] As a preferred embodiment of the present invention, the water guide plate includes a base plate and an edge plate, the base plate being fixedly connected to the lower side of the mounting plate, and the edge plate being fixedly connected to the edge of the base plate away from the mounting plate.

[0012] In a preferred embodiment of the present invention, the first sponge strip has a plurality of gaps; and the mounting plate has a first slot, which is aligned with the gaps; the side plate has a second slot on its lower side, which engages with the mounting plate and the first slot, and the side plate can engage in the gaps, with the lower edge of the side plate adhering to the upper surface of the base plate, and the lower side of the side plate adhering to the edge plate; the side of the second sponge strip away from the mounting plate is aligned with the first sponge strip.

[0013] As a preferred embodiment of the present invention, the sum of the thicknesses of the second sponge strip and the side plate is greater than the thickness of the gap.

[0014] In a preferred embodiment of the present invention, the slider has a channel, and the slider is fixedly connected to a first pipe communicating with the channel; the mounting plate has a through hole, the bottom of the through hole is flush with the upper surface of the base plate; the first pipe is inserted into the through hole, and water inlets are provided on the left and right sides of the first pipe.

[0015] As a preferred embodiment of the present invention, a second pipe is fixedly connected to the other end of the channel, and a circular hole is provided on the lower side of the second pipe. A limiting ring is fixedly connected to the lower side of the circular hole, and a measuring cylinder is engaged with the limiting ring.

[0016] As a preferred embodiment of the present invention, the end of the second pipe is threadedly connected to a screw rod, and the outer end of the screw rod is fixedly connected to a dial; a connecting block is fixedly connected to the middle of the edge plate, and the connecting block has a threaded groove on the side near the mounting plate, and the end of the screw rod is connected to the threaded groove.

[0017] As a preferred embodiment of the present invention, a first strip-shaped hole is provided above the second pipe, and an arc-shaped second strip-shaped hole is provided on the screw. An insert that can be elastically bent is slidably inserted into the first strip-shaped hole and the second strip-shaped hole. The portion of the insert located below the second strip-shaped hole is inclined to one side, and the lower end of the insert is attached to the inner wall of the measuring cylinder opening.

[0018] As a preferred embodiment of the present invention, the slide is a strip-shaped slide, the slider is an I-shaped block, the slider has a positioning hole, and a positioning rod is fixedly connected to the back side of the mounting plate. When the mounting plate is attached to the slider, the positioning rod is inserted into the positioning hole, and the end of the positioning rod is pressed against the support frame.

[0019] As a preferred embodiment of the present invention, the surface of the slide is provided with graduated grooves.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. Adapted to the characteristics of flexible reinforced retaining walls, providing accurate and reliable permeability test data. This device employs a flexible first sponge strip water collection structure, which adapts to the naturally uneven surface and undulating features of flexible reinforced retaining walls. It perfectly conforms to the surface of the wall material, completely avoiding the seepage leakage and water flow interference problems of traditional rigid testing structures. It can completely and accurately collect the permeable water volume of the flexible reinforced retaining wall, truly restoring the permeability performance parameters of the flexible reinforced retaining wall. At the same time, the second sponge strip can effectively block lateral seepage, further eliminating external interference and significantly improving the accuracy of core test data such as the permeability coefficient and seepage volume of the flexible reinforced retaining wall, providing a reliable basis for the performance calibration of flexible reinforced retaining walls.

[0022] 2. This device enables layered permeability testing of flexible reinforced retaining walls, supporting the optimization of key parameters such as layer height, compaction degree, and stacking structure of the fill material. Through an adjustable structure design with sliding tracks and sliders, this device can flexibly match the layered filling structure of the flexible reinforced retaining wall, precisely adjust the layered testing height, and independently test the permeability performance of flexible reinforced retaining walls with different fill layer heights. It can accurately obtain the gradient differences in vertical permeability performance of the flexible reinforced retaining wall, clearly identify the influence of material layer ratios and compaction processes on permeability performance, and effectively overcome the shortcomings of traditional equipment in conducting layered performance testing of flexible reinforced retaining walls. This provides crucial experimental data support for the iteration of fill material formulations, optimization of construction processes, and improvement of structural design for flexible reinforced retaining walls.

[0023] 3. Enables precise localized inspection of flexible reinforced retaining walls, facilitating the tracing and rectification of localized defects. This device, through the cooperation of detachable side plates and mounting plates, can quickly construct a closed, independent inspection area. It conducts isolated permeability tests on suspected defective areas and key inspection areas of flexible reinforced retaining walls, accurately identifying permeability or siltation exceeding standards caused by localized pore abnormalities, insufficient compaction, or molding defects. This allows for precise location and tracing of localized performance defects in flexible reinforced retaining walls, solving the problem that traditional inspection methods cannot distinguish between the overall performance and localized defects of flexible reinforced retaining walls. It meets the refined testing needs for quality verification, performance rectification, and process optimization of flexible reinforced retaining walls.

[0024] 4. Flexible and adjustable structure, adaptable to various testing scenarios for flexible reinforced retaining walls. This device adopts a detachable and adjustable modular structure, which can flexibly adjust the testing spacing and range according to flexible reinforced retaining wall samples with different mix ratios, thicknesses, and molding processes. The equipment has strong versatility and test adaptability, and is simple and efficient to operate. It can significantly improve the efficiency of R&D testing, factory testing, and engineering sampling of the permeability performance of flexible reinforced retaining walls, and strongly support the engineering promotion and technological iteration of flexible reinforced retaining walls. Attached Figure Description

[0025] Figure 1 This is a first-view structural schematic diagram of the flexible reinforced retaining wall permeability test device provided in an embodiment of the present invention;

[0026] Figure 2 This is provided by the embodiments of the present invention. Figure 1 A magnified structural diagram of part A in the middle;

[0027] Figure 3 This is provided by the embodiments of the present invention. Figure 1 A magnified structural diagram of part B in the middle section;

[0028] Figure 4This is a second-view structural schematic diagram of the flexible reinforced retaining wall permeability test device provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the main structure of the flexible reinforced retaining wall permeability test device provided in an embodiment of the present invention;

[0030] Figure 6 This is provided by the embodiments of the present invention. Figure 5 A cross-sectional view of the CC section.

[0031] Figure 7 This is provided by the embodiments of the present invention. Figure 6 A magnified structural diagram of section D in the middle;

[0032] Figure 8 This is provided by the embodiments of the present invention. Figure 7 A magnified structural diagram of section E in the middle;

[0033] Figure 9 This is a cross-sectional structural schematic diagram of the permeability test device for flexible reinforced retaining walls provided in an embodiment of the present invention;

[0034] Figure 10 This is provided by the embodiments of the present invention. Figure 9 A magnified structural diagram of section F in the middle;

[0035] Figure 11 This is provided by the embodiments of the present invention. Figure 9 A magnified structural diagram of section G in the middle;

[0036] Figure 12 This is a schematic diagram of the internal structure of the measuring cylinder portion provided in an embodiment of the present invention;

[0037] Figure 13 This is provided by the embodiments of the present invention. Figure 12 A magnified structural diagram of section H in the middle.

[0038] In the diagram: 1. Support frame; 2. Slide rail; 3. Slider; 4. Mounting plate; 5. First sponge strip; 6. Water guide plate; 601. Base plate; 602. Edge plate; 7. Side plate; 8. Second sponge strip; 9. Gap; 10. First slot; 11. Second slot; 12. Channel; 13. First pipe; 14. Through hole; 15. Water inlet; 16. Second pipe; 17. Round hole; 18. Limiting ring; 19. Measuring cylinder; 20. Screw; 21. Dial; 22. Connecting block; 23. Screw groove; 24. First strip hole; 25. Second strip hole; 26. Insert; 27. Positioning hole; 28. Positioning rod; 29. ​​Scale groove. Detailed Implementation

[0039] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0040] The structure of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] like Figures 1 to 13 As shown in the figure, an embodiment of the present invention provides a permeability testing device for a flexible reinforced retaining wall, comprising a support frame 1, a slide rail 2 on the support frame 1, a plurality of sliders 3 slidably connected to the slide rail 2, and a detachable mounting plate 4 fixedly connected to each slider 3. A first sponge strip 5 is fixedly connected to one side of the mounting plate 4; a rectangular water guide plate 6 is fixedly connected to the lower side of the mounting plate 4, the water guide plate 6 being located below the first sponge strip 5, and the side of the first sponge strip 5 away from the mounting plate 4 protruding from the water guide plate 6; detachable side plates 7 are fixedly connected to both ends of the mounting plate 4, and a second sponge strip 8 is fixedly connected to the outer surface of the side plate 7.

[0042] Specifically, the surface of the slide 2 is provided with graduated grooves 29. The graduated grooves 29 can visually display the sliding displacement and spacing of the sliders 3. Test personnel can precisely adjust the spacing height of each slider 3 according to the graduated grooves 29, accurately setting the layer height and local testing range of the flexible reinforced retaining wall, achieving quantification and precise adjustment of the testing points. This completely solves the problem of traditional equipment relying on manual visual adjustment and having large errors. It can precisely control the testing spacing of each group of testing units, ensuring the consistency and accuracy of layered and multi-point testing, and significantly improving the accuracy and standardization of layered and comparative tests of the permeability performance of flexible reinforced retaining walls.

[0043] This device addresses the structural characteristics and permeability testing requirements of flexible reinforced retaining walls. Based on the core principles of flexible bonding for precise water sampling, adjustable layered material performance testing, and closed-loop local material defect verification, it achieves comprehensive and refined testing of the permeability performance of flexible reinforced retaining walls. The overall operation process and working principle are as follows:

[0044] First, relying on the structure of the slide rail 2 and the sliding slider 3 on the support frame 1, and combined with the layered filling height of the flexible reinforced retaining wall and the requirements of material testing conditions, the spacing of each slider 3 is adjusted to accurately correspond to the testing positions of different filling layer heights of the new material. After the layered testing height is calibrated, the slider 3 is locked to achieve precise point positioning for the vertical layered structure of the flexible reinforced retaining wall. The detachable mounting plate 4 on the slider 3 serves as the core testing carrier, which can be flexibly disassembled and adapted according to the size of the flexible reinforced retaining wall sample and the testing area, meeting the testing needs of different specifications and types of flexible reinforced retaining walls.

[0045] Subsequently, the first sponge strip 5 on one side of the mounting plate 4 is attached to the outer surface of the flexible reinforced retaining wall until the edge of the water guide plate 6 on the lower side of the mounting plate 4 is in contact with the wall surface. Utilizing the flexible and adaptive properties of the first sponge strip 5, it closely adheres to the uneven and irregularly shaped surface of the flexible reinforced retaining wall, absorbing water seeping from the surface of the flexible reinforced retaining wall in all directions. This completely solves the problem that traditional rigid detection structures cannot adapt to the surface shape of flexible reinforced retaining walls and that seepage water collection is incomplete, ensuring that seepage water from all parts of the flexible reinforced retaining wall can be completely collected without any blind spots in the detection. At the same time, the water guide plate 6 is located below the first sponge strip 5, which can stably receive the seepage water overflowing after being absorbed by the sponge, realizing the centralized collection and quantitative acquisition of seepage water from the flexible reinforced retaining wall.

[0046] Secondly, by adjusting the independent spacing between multiple sets of independent sliders 3 and mounting plates 4, multiple detection units correspond one-to-one with material areas of different vertical filling layer heights and different lateral positions of the flexible reinforced retaining wall. Each detection unit is independent and does not interfere with each other, and can simultaneously complete independent testing of the permeability performance of different levels and positions of the flexible reinforced retaining wall. This allows for accurate acquisition of the layered permeability parameters of the flexible reinforced retaining wall, and a direct comparison of the differences in permeability performance of the flexible reinforced retaining wall in different filling areas. This provides data support for optimizing the layered structure of the flexible reinforced retaining wall and improving the filling process.

[0047] Finally, to address the needs for local performance testing and defect tracing of flexible reinforced retaining walls, the detachable side plates 7 at both ends of the mounting plate 4 are used to isolate and seal the local testing area. The upper end of the lower side plate 7 is attached to the upper mounting plate 4, and multiple mounting plates 4 arranged vertically and horizontally, in conjunction with the side plates 7 on the left and right sides, form a closed, independent testing area, precisely defining the local testing range of the flexible reinforced retaining wall. During the testing process, seepage water within the closed area is fully collected by the first sponge strip 5, while seepage water outside the area is completely blocked by the second sponge strip 8 on the outer side of the side plate 7, preventing interference from water flow outside the testing area. Only seepage water from the target local flexible reinforced retaining wall is collected, achieving precise detection and tracing of local water permeability anomalies and local process defects in the flexible reinforced retaining wall.

[0048] Furthermore, the water guide plate 6 includes a base plate 601 and an edge plate 602. The base plate 601 is fixedly connected to the lower side of the mounting plate 4, and the edge plate 602 is fixedly connected to the edge of the base plate 601 away from the mounting plate 4. The base plate 601, as a horizontal water-collecting surface, is mainly used to collect seepage water dripping from the first sponge strip 5 under gravity, achieving stable collection of seepage water. During the test, the edge plate 602 adheres to the outer wall of the flexible reinforced retaining wall. On the one hand, it can cooperate with the first sponge strip 5 to form a complete sealed water-collecting area, effectively preventing seepage water on the surface of the base plate 601 from overflowing and dissipating, solving the problem of seepage leakage caused by uneven wall surface; on the other hand, it can also limit and protect the first sponge strip 5, avoiding excessive contact with the wall surface leading to compression deformation, collapse, and failure, ensuring the long-term stable water absorption and conduction performance of the sponge strip, and further improving the integrity and detection accuracy of seepage collection in the flexible reinforced retaining wall.

[0049] The first sponge strip 5 has several gaps 9; and the mounting plate 4 has a first slot 10, which is aligned with the gaps 9; the side plate 7 has a second slot 11 on its lower side, which engages with the mounting plate 4 and the first slot 10, and the side plate 7 can engage in the gaps 9; the lower edge of the side plate 7 is attached to the upper surface of the base plate 601, and the lower side of the side plate 7 is attached to the edge plate 602; the side of the second sponge strip 8 away from the mounting plate 4 is aligned with the first sponge strip 5. The first sponge strips 5 are arranged at intervals and form several gaps 9 between adjacent ones. The mounting plate 4 has a first slot 10 that corresponds to each gap 9. The side plate 7 has a second slot 11 on its lower side. The side plate 7 is engaged with the mounting plate 4 and the first slot 10 through the second slot 11. At the same time, the lower part of the side plate 7 can be inserted into the gap 9 of the first sponge strips 5. The lower edge of the side plate 7 is attached to the upper surface of the bottom plate 601. The lower side of the side plate 7 is attached to the edge plate 602 of the water guide plate 6. The outer end face of the second sponge strip 8 on the outer side of the side plate 7 is aligned with the outer end face of the first sponge strip 5 to form a flush overall bonding surface.

[0050] Its working principle is as follows: Through the alignment and snap-fit ​​structure of the slot and gap 9, the side plate 7 and the mounting plate 4 can be quickly and detachably assembled. After assembly, the bottom of the side plate 7 is completely fitted with the water guide plate 6 without any assembly gaps, so that the two ends of the water guide plate 6 rely on the side plate 7 to form a closed water-blocking structure, making up for the structural gap of no fixed shielding at the two ends of the water guide plate 6. When the seepage water absorbed by the first sponge strip 5 drips onto the surface of the bottom plate 601 of the water guide plate 6, the two side plates 7 can form a lateral blockage of the water flow, preventing the seepage water from leaking from the two ends of the water guide plate 6. At the same time, the end face of the second sponge strip 8 is flush with the end face of the first sponge strip 5, so that the overall detection bonding surface can completely fit the flexible reinforced retaining wall surface, forming a complete lateral sealing barrier. Seepage water from the outer non-detection area cannot invade the detection area, structurally ensuring the independence of water flow in a single independent detection area, avoiding water flow interference when detecting multiple areas, and accurately ensuring the accuracy of local and layered permeability detection of the flexible reinforced retaining wall.

[0051] Specifically, the sum of the thicknesses of the second sponge strip 8 and the side plate 7 is greater than the thickness of the gap 9. When the side plate 7 and the lower side of the second sponge strip 8 are inserted into the gap 9 of the first sponge strip 5, the second sponge strip 8 and the first sponge strip 5 are pressed together by the thickness interference characteristic, generating an elastic compression constraint force. On the one hand, this greatly improves the firmness of the side plate 7's snap-fit ​​assembly, preventing the side plate 7 from loosening, shifting, or falling off due to water flow impact or equipment vibration during the test, ensuring the sealing stability of the test area; on the other hand, the sealing performance is further improved after the sponge strips are pressed together, which can completely seal the tiny gaps at the gap 9 position, eliminate the problem of water leakage, further optimize the sealing environment for local water permeability testing of flexible reinforced retaining walls, and ensure stable and reliable test data.

[0052] Furthermore, the slider 3 has a channel 12, and a first pipe 13 communicating with the channel 12 is fixedly connected to the slider 3; a through hole 14 is provided on the mounting plate 4, and the bottom of the through hole 14 is flush with the upper surface of the base plate 601; the first pipe 13 is inserted into the through hole 14, and water inlets 15 are provided on the left and right sides of the first pipe 13. The seepage water collected by the water guide plate 6 can flow smoothly into the first pipe 13 through the through hole 14. The symmetrically opened water inlets 15 on the left and right sides increase the water flow area, which can quickly collect the seepage water in various places in the water guide plate 6 and avoid water accumulation. Meanwhile, the structural design of the bottom surface of the through hole 14 being flush with the bottom plate 601 eliminates dead corners for water accumulation. The seepage water in the water guide plate 6 can flow completely into the first pipe 13 and be directionally transported through the internal channel 12 of the slider 3. This achieves fully automatic collection, diversion and transportation of seepage water in the flexible reinforced retaining wall without the need for manual assistance. This not only improves the thoroughness of seepage water collection but also simplifies the test operation process and ensures the accuracy of water volume collection for layered and local permeability detection.

[0053] The other end of the channel 12 is fixedly connected to a second pipe 16. A circular hole 17 is provided on the lower side of the second pipe 16, and a limiting ring 18 is fixedly connected to the lower side of the circular hole 17. A measuring cylinder 19 is engaged with the limiting ring 18. Seepage water transported through the first pipe 13 and the slider 3 channel 12 can directly flow into the second pipe 16, and finally drip through the bottom circular hole 17 into the measuring cylinder 19 engaged with the limiting ring 18, achieving precise quantitative collection of seepage water. The limiting ring 18 can radially limit and fix the measuring cylinder 19, preventing it from shifting or falling off, and ensuring stability during the water collection process. This structure integrates seepage water diversion and quantitative collection, accurately measuring the seepage water volume in the corresponding test area of ​​the flexible reinforced retaining wall. It provides accurate water volume data support for calculating core parameters such as the material's permeability coefficient and permeability rate, meeting the quantitative testing requirements for the permeability performance of new materials.

[0054] The end of the second pipe 16 is threaded with a screw 20, and the outer end of the screw 20 is fixedly connected to a dial 21. A connecting block 22 is fixedly connected to the middle of the edge plate 602. The connecting block 22 has a threaded groove 23 on the side near the mounting plate 4, and the end of the screw 20 is connected to the threaded groove 23. By rotating the dial 21, the screw 20 can be rotated forward or backward, so that the end of the screw 20 is screwed into or out of the threaded groove 23 of the connecting block 22. When the screw 20 is screwed into the threaded groove 23, the water guide plate 6 and the mounting plate 4 can be tightened and fixed to the front end of the slider 3 as a whole, realizing the rigid locking and positioning of the mounting plate 4 and the slider 3, and completely eliminating the assembly gap 9 and loose displacement. This structure realizes the detachable locking assembly of the water guide plate 6 and the slider 3. The assembly structure is stable and easy to disassemble and assemble. It can effectively avoid the displacement of the detection unit during the test, ensure that the sponge strip and the water guide plate 6 are always in contact with the flexible reinforced retaining wall surface, and ensure the stability of the test conditions.

[0055] Furthermore, a first strip-shaped hole 24 is provided above the second pipe 16, and an arc-shaped second strip-shaped hole 25 is provided on the screw 20. An elastically bendable insert 26 is slidably inserted into the first strip-shaped hole 24 and the second strip-shaped hole 25. The portion of the insert 26 located below the second strip-shaped hole 25 is inclined to one side, and the lower end of the insert 26 is attached to the inner wall of the opening of the measuring cylinder 19. After the screw 20 is screwed and locked, the insert 26 is inserted into the aligned and overlapping first strip-shaped hole 24 and second strip-shaped hole 25 to achieve circumferential limiting and locking of the screw 20 and the second pipe 16, preventing the screw 20 from reversing and loosening due to vibration, and further improving the overall assembly and locking stability. Meanwhile, the lower end of the insert 26 can tightly fit and press against the inner wall of the opening of the measuring cylinder 19, and perform secondary pressing and fixing of the measuring cylinder 19, thus doubly ensuring the installation stability of the measuring cylinder 19, eliminating water contact errors caused by shaking or displacement of the measuring cylinder 19, and further improving the measurement accuracy of water permeability detection of flexible reinforced retaining walls.

[0056] Specifically, the slide 2 is a strip-shaped slide, the slider 3 is an I-shaped block, and the slider 3 has a positioning hole 27. A positioning rod 28 is fixedly connected to the back side of the mounting plate 4. When the mounting plate 4 is attached to the slider 3, the positioning rod 28 is inserted into the positioning hole 27, and the end of the positioning rod 28 is pressed against the support frame 1. The I-shaped slider 3 is compatible with the strip-shaped slide, which can ensure that the slider 3 slides smoothly and linearly along the slide 2, with high adjustment accuracy and no jamming or deviation. The insertion and cooperation of the positioning rod 28 and the positioning hole 27 can realize the quick alignment and installation of the mounting plate 4 and the slider 3, and achieve radial positioning limit; with the axial locking effect of the screw 20, the end of the positioning rod 28 presses against the surface of the support frame 1, and the slider 3 is locked as a whole by friction, which completely locks the adjustment position of the slider 3, eliminates the problem of slider 3 slippage and detection point deviation during the test, ensures the accuracy of layer detection height and local detection area, and adapts to the high-precision point detection requirements of flexible reinforced retaining walls.

[0057] Working principle of the invention:

[0058] The entire device relies on the support frame 1 and the strip slide as the reference support and adjustment base. The I-shaped slider 3 slides smoothly along the slide 2, and the scale groove 29 on the side of the slide 2 enables visual and precise spacing adjustment. The vertical height of different detection units can be flexibly set according to the test requirements, matching the structural characteristics of the layered filling of the flexible reinforced retaining wall, and realizing the accurate calibration of the layered permeability detection points. During the equipment assembly stage, the mounting plate 4 is quickly aligned and installed by inserting the positioning rod 28 on the back of the mounting plate 4 with the positioning hole 27 of the slider 3. At the same time, the side plate 7 is detachably assembled by using the locking groove at the bottom of the side plate 7 to engage with the first locking groove 10 of the mounting plate 4 and the gap 9 of the first sponge strip 5. The interference fit between the side plate 7 and the second sponge strip 8 improves the assembly sealing and structural firmness, so that the bottom of the side plate 7 is completely attached to the water guide plate 6 and the side is attached to the edge plate 602, forming a closed water-blocking structure at both ends of the water guide plate 6, preventing water seepage and side leakage.

[0059] While water is being collected and supplied, the screw 20 is screwed into the threaded groove 23 of the connecting block 22 of the edge plate 602 by turning the end dial 21. This achieves overall tension and fixation of the mounting plate 4, the water guide plate 6, and the slider 3, while simultaneously pressing the positioning rod 28 to securely lock the slider 3 onto the support frame 1. After the screw 20 is locked in place, the insert 26 is inserted through the aligned slot to achieve anti-reverse locking of the screw 20 and presses the opening of the measuring cylinder 19, simultaneously completing the integrated self-locking fixation of slider 3 positioning, wall plate fixing, and measuring cylinder 19 pressing. In addition, the structure of the screw 20 passing through the flow guide channel 12 allows for simultaneous unblocking of the pipeline during assembly and debugging, effectively preventing water seepage and impurities from causing pipeline blockage and ensuring the long-term accuracy of equipment flow guidance and metering.

[0060] During the inspection, the flexible first sponge strip 5 on the side of the mounting plate 4 adaptively fits the uneven surface of the flexible reinforced retaining wall, fully absorbing the water seeping out of the wall. In conjunction with the water guide plate 6, it receives the overflowing water from the sponge. At the same time, the second sponge strip 8 on the outer side of the side plate 7 is flush with the first sponge strip 5 to form an integral sealing surface, which can block the interference of water seepage from external non-inspection areas. For local fixed-point inspection, the upper and lower mounting plates 4 and the left and right side plates 7 form a closed independent inspection area, realizing the single collection of water seepage in the target area and completely eliminating water flow interference between areas. After water collection, the seepage water within the guide plate 6, free of dead zones, flows through the through-hole 14 of the mounting plate 4 into the first pipe 13, and is then guided through the internal channel 12 of the slider 3 to the second pipe 16. Finally, it drips from the bottom hole 17 of the second pipe 16 into the measuring cylinder 19, which is engaged with the limiting ring 18, completing the precise quantitative collection of seepage water. Simultaneously, the water absorbed and retained by the sponge can be statistically analyzed through subsequent weighing, achieving dual-dimensional water volume collection of sponge water retention and overflow water, accurately characterizing the true permeability performance of the flexible reinforced retaining wall. In summary, this device, through the coordinated operation of the entire structure, completely solves the problems of traditional equipment being unable to adapt to uneven wall surfaces, unable to perform layered testing, unable to perform local isolation testing, having poor metering accuracy, and being prone to loosening and clogging. It stably achieves refined, precise, and standardized testing of the permeability performance of various flexible reinforced retaining walls.

[0061] It should be noted that the water absorption is divided into two parts: one part is the water inside the sponge, and the other part is the water overflowing from the sponge. The sponge needs to be weighed, and the overflowing water needs to be measured using a graduated cylinder 19. How to collect the overflowing water from the sponge into the graduated cylinder 19 is a challenge. If a hose is used to deliver the water to the graduated cylinder 19, not only does the graduated cylinder 19 need to be held during water collection, but the hose also obstructs the weighing of the first sponge layer afterward, requiring the hose to be unplugged. This application solves this problem.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flexible reinforced retaining wall permeability test device, characterized by, Includes a support frame (1), on which a slide rail (2) is provided, and several sliders (3) are slidably connected on the slide rail (2). Each slider (3) is fixedly connected to a detachable mounting plate (4), and a first sponge strip (5) is fixedly connected to one side of the mounting plate (4). A rectangular water guide plate (6) is fixedly connected to the lower side of the mounting plate (4). The water guide plate (6) is located below the first sponge strip (5), and the side of the first sponge strip (5) away from the mounting plate (4) protrudes from the water guide plate (6). The mounting plate (4) is fixedly connected to two detachable side plates (7) at both ends, and a second sponge strip (8) is fixedly connected to the outer surface of the side plate (7).

2. The permeability testing device for a flexible reinforced retaining wall as described in claim 1, characterized in that: The water guide plate (6) includes a base plate (601) and an edge plate (602). The base plate (601) is fixedly connected to the lower side of the mounting plate (4), and the edge plate (602) is fixedly connected to the edge of the base plate (601) away from the mounting plate (4).

3. The permeability testing device for a flexible reinforced retaining wall as described in claim 2, characterized in that: The first sponge strip (5) has several gaps (9); and the mounting plate (4) has a first slot (10), which is aligned with the gaps (9); the side plate (7) has a second slot (11) on its lower side, which is engaged with the mounting plate (4) and the first slot (10), and the side plate (7) can be engaged in the gaps (9). The lower edge of the side plate (7) is attached to the upper surface of the base plate (601), and the lower side of the side plate (7) is attached to the edge plate (602); the side of the second sponge strip (8) away from the mounting plate (4) is aligned with the first sponge strip (5).

4. The permeability testing device for a flexible reinforced retaining wall as described in claim 3, characterized in that: The sum of the thicknesses of the second sponge strip (8) and the side plate (7) is greater than the thickness of the gap (9).

5. The permeability testing device for a flexible reinforced retaining wall as described in claim 2, characterized in that: The slider (3) has a channel (12) and the slider (3) is fixedly connected to a first pipe (13) that communicates with the channel (12). The mounting plate (4) has a through hole (14), the bottom of which is flush with the upper surface of the base plate (601); The first pipe (13) is inserted into the through hole (14), and water inlets (15) are provided on the left and right sides of the first pipe (13).

6. The permeability testing device for a flexible reinforced retaining wall as described in claim 5, characterized in that: The other end of the channel (12) is fixedly connected to a second pipe (16), and a round hole (17) is provided on the lower side of the second pipe (16). A limit ring (18) is fixedly connected to the lower side of the round hole (17), and a measuring cylinder (19) is engaged with the limit ring (18).

7. The permeability testing device for a flexible reinforced retaining wall as described in claim 6, characterized in that: The end of the second pipe (16) is threaded with a screw (20), and the outer end of the screw (20) is fixedly connected with a dial (21). A connecting block (22) is fixedly connected to the middle of the edge plate (602). The connecting block (22) has a screw groove (23) on the side near the mounting plate (4). The end of the screw (20) is connected to the screw groove (23).

8. The permeability testing device for a flexible reinforced retaining wall as described in claim 7, characterized in that: The second pipe (16) has a first strip hole (24) above it, and the screw (20) has an arc-shaped second strip hole (25). A flexible insert (26) is slidably inserted into the first strip hole (24) and the second strip hole (25). The part of the insert (26) located below the second strip hole (25) is inclined to one side, and the lower end of the insert (26) is attached to the inner wall of the opening of the measuring cylinder (19).

9. The permeability testing device for a flexible reinforced retaining wall as described in claim 8, characterized in that: The slide (2) is a strip slide, the slider (3) is an I-shaped block, the slider (3) is provided with a positioning hole (27), and the mounting plate (4) is fixedly connected to the back side with a positioning rod (28). When the mounting plate (4) is attached to the slider (3), the positioning rod (28) is inserted into the positioning hole (27), and the end of the positioning rod (28) is pressed against the support frame (1).

10. The flexible reinforced retaining wall permeability test apparatus of claim 9, wherein: The surface of the slide (2) is provided with a graduated groove (29).

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