47 results about "Geosynthetics" patented technology

The invention discloses a multifunctional geotechnical mechanical testing system for controlling temperature, humidity and salinity in an extreme environment, and relates to the technical field of ocean geotechnical engineering and geotechnical engineering. The system integrates a high-precision temperature and humidity and salinity control system, can accurately simulate the influence of complex environments such as extreme temperature and humidity, salt spray corrosion and the like on the mechanical properties of geotechnical materials, supports a direct shear test, a pull-out test, a soil body single-particle crushing test and a geosynthetic material stretching and puncturing test, can distinguish static, dynamic and long-term creep test modes, and can be used for testing the mechanical properties of the geotechnical materials. Comprising creep mechanical property testing under cyclic direct shear and continuous load. A visual monitoring assembly is additionally arranged, so that the microscopic deformation and damage process of the sample can be recorded in real time. Through multifunctional integration, temperature, humidity and salinity joint control, visual monitoring and dynamic and static coupling test devices, the technical bottlenecks of single function, environment simulation limitation and microcosmic observation deficiency of traditional equipment are solved, and high engineering application value and popularization potential are achieved.

The invention discloses a polyethylene composite geomembrane and a processing technology thereof in the field of geosynthetic materials. The polyethylene composite geomembrane is prepared from the following raw materials: high-density polyethylene, polyethylene grafted maleic anhydride, a nano montmorillonite / low-density polyethylene composite modifier, an antioxidant, a light stabilizer and a lubricant calcium stearate. Wherein the polyethylene grafted maleic anhydride is prepared by drying high-density polyethylene, mixing the dried high-density polyethylene with maleic anhydride, an initiator and an antioxidant, and performing melt extrusion through a double-screw extruder, so that the surface polarity is improved; the nano-montmorillonite / low-density polyethylene composite modifier is prepared by ultrasonically dispersing Na-montmorillonite, adding hexadecyl trimethyl ammonium bromide, stirring, centrifugally drying to obtain organic modified montmorillonite, mixing the organic modified montmorillonite with low-density polyethylene, performing intercalation reaction, and performing twin-screw extrusion and blending, so that the barrier property is enhanced. The processing technology comprises the steps of raw material mixing, twin-screw extrusion granulation and calendaring molding, and finally the polyethylene composite geomembrane with remarkably improved interface cohesiveness, weather resistance and barrier property is prepared.

The invention relates to a geosynthetic material tensile test device, and belongs to the technical field of geosynthetic material test equipment. Comprising a plurality of clamping mechanisms, a plurality of pressure adjusting mechanisms, a plurality of thrust adjusting mechanisms, a plurality of displacement mechanisms and a control mechanism. The multiple sets of clamping mechanisms sequentially clamp the two sides of the geosynthetics in the width direction in the length direction of the geosynthetics, the pressure adjusting mechanisms penetrate through the clamping mechanisms, the clamping mechanisms are slidably installed on the displacement mechanism, and the multiple thrust adjusting mechanisms are connected with the multiple sets of clamping mechanisms in a one-to-one correspondence mode. The two ends of the geosynthetics in the length direction are connected with tension equipment, a first pressure sensor is arranged between the geosynthetics and the clamping mechanism, and a second pressure sensor is arranged between the thrust adjusting mechanism and the clamping mechanism. According to the invention, the quantitative relation among the longitudinal tensile strength, the normal load and the transverse tensile strength of the geosynthetic material in the soil can be explored at a relatively low test cost.

The application relates to a polypropylene filament needle-punched geotextile and a preparation method and application thereof, and belongs to the field of geosynthetic materials. The geotextile comprises a wear-resistant surface layer, a toughness intermediate layer and a drainage bottom layer, wherein the wear-resistant surface layer, the toughness intermediate layer and the drainage bottom layer are integrally formed through cross needle punching; the preparation raw material of the geotextile comprises, according to mass percentage, 80-88% of copolymerized polypropylene, 6-14% of a toughening agent, 2.5-4% of a composite anti-freezing agent, 1.5-2.5% of an anti-corrosive agent, 1.5-2.5% of a composite anti-aging agent and 0.5-1% of a dispersing agent; the toughening agent comprises POE and TPE; and the composite anti-freezing agent comprises ethylene glycol monostearate and nano calcium carbonate. The geotextile of the application adopts a compounded toughening system and cross needle punching to form a stable fiber network, the unique anti-freezing formula and fiber structure improve the freeze-thaw stability, the gradient pore size structure is combined with a modified liquid to improve the drainage efficiency, and the preparation process has high adaptability and is easy to popularize.

The utility model relates to the technical field of silt dams, in particular to a silt dam based on a geosynthetic material composite structure, which comprises a trapezoidal dam shell, the dam shell comprises an upstream slope, a dam crest and a downstream slope, a dam body impermeable layer is laid on the upstream slope, and the dam body impermeable layer comprises a cushion material, a geomembrane and a geotechnical bag which are sequentially arranged from bottom to top. The adjacent geomembranes are connected through hot welding without gaps, grass is planted on the downstream slope for slope protection, a top anti-seepage layer is arranged on the dam top, a drainage blind pipe is arranged at the bottom of the dam shell, and a horizontal anti-seepage layer is laid on the riverbed on the left side of the dam shell. The anti-seepage dam is reasonable and compact in structure and convenient to use, and the horizontal anti-seepage layer is laid on the riverbed on the upstream of the dam shell, so that the seepage path is prolonged, seepage of a dam foundation is reduced, seepage around the dam abutment of the dam body is prevented, and the risk that the dam shell is damaged due to seepage is reduced.

The invention discloses a geosynthetic material wrapped gravel pile composite structure and a construction method thereof.The gravel pile composite structure comprises a geosynthetic material wrapping layer and a gravel pile body, the geosynthetic material wrapping layer is of an annular cylindrical barrel structure formed by geosynthetic materials, and the gravel pile body is of a cylinder structure formed by gravel; the geosynthetic material wrapping layer wraps the periphery of the gravel pile body. The reinforcing rings are uniformly arranged on the periphery of the geosynthetic material wrapping layer in a spiral shape, the reinforcing rings are fixedly connected with the geosynthetic material wrapping layer through steel bar binding, the fiber grating sensors are embedded into bent parts and straight section parts of the reinforcing rings at intervals, and the fiber grating sensors are used for collecting dynamic strain data of the gravel pile body in real time. The reinforcing ring provided by the invention can prevent lateral deformation of the geosynthetics wrapping layer and the gravel pile body, and the overall stability of the gravel pile composite structure in a complex stress environment is greatly improved.

A curvilinear embed apparatus is disclosed for enabling connection of a geosynthetic reinforcement belt to a concrete wall panel of a mechanically stabilized earth (MSE) retaining wall. The curvilinear embed apparatus has walls defining a channel that extends from a first aperture through a curved body to a second aperture. The channel and apertures have a continuous uniform rectangular cross section, thereby creating a curvilinear tube-like structure. The reinforcement belt is passed through the rectangular channel. The curved body implements the requisite anchoring effect while also enabling easy insertion and passage of the geosynthetic reinforcement belt through the curvilinear embed apparatus. The curved body is also designed to cause the rectangular cross section as well as any anchored reinforcement belt to be rotated by 180 degrees from the first aperture to the second aperture.

The invention discloses an immersed tube tunnel foundation reinforcing structure and a construction method, and relates to the technical field of foundation reinforcement, the immersed tube tunnel foundation reinforcing structure comprises a foundation and a plurality of gravel piles, the gravel piles penetrate through the foundation, each gravel pile comprises a geosynthetic material, first gravel and a reinforcing piece, and the geosynthetic materials are arranged in a surrounding mode to form a hollow columnar structure; the geosynthetics arranged in the surrounding mode are filled with first broken stones, and the reinforcing pieces are arranged in the geosynthetics arranged in the surrounding mode; and the gabion layer and the second gravel are arranged on the gravel pile in the height direction, the gabion layer is arranged above the gravel pile and connected with the reinforcing piece, and the gabion layer is filled with the second gravel. Therefore, the gravel piles penetrate through the foundation, and the gabion layer is arranged above the gravel piles and is connected with the reinforcers, so that the risks of instability and non-uniform settlement of the immersed tunnel foundation under the action of strong shock or load can be reduced, and the bearing capacity and rigidity of the immersed tunnel foundation are remarkably improved; and the anti-seismic property and the stability of the immersed tunnel foundation can be improved.

The application discloses a kind of geosynthetic materials of enhanced waterproof and drainage integrated structure, it is related to building material technical field.The geosynthetic material of the application includes geotextile and filled modified bentonite composition;Modified bentonite composition includes the following weight parts of raw materials: 85-95 weight parts modified bentonite, 2-7.5 weight parts modified cellulose.The preparation method of modified bentonite includes the following steps: S1: with active white clay, CaO is used as raw material dry, component two is washed with hydrochloric acid;S2: component two is obtained component three under the modification of gluconic acid lactone lactone;S4: component three, surface is polymerized to obtain modified bentonite by acrylamide.The geosynthetic material prepared in the application has the advantage of keeping low permeability under repeated load.

The invention discloses a waste tire gravel aggregate geotextile material composite structure and a preparation method and application thereof.The waste tire gravel aggregate geotextile material composite structure comprises a waste tire with a tire wall removed, a plurality of prefabricated holes are formed in a tire crown of the waste tire, one side of the waste tire takes a geosynthetic material as a substrate, and an open containing structure is formed on the other side; the containing structure of the waste tires is filled with gravel aggregate. The waste tires and the base are connected through the connecting pieces, and the connecting pieces are further used for clamping the two adjacent waste tires. The waste tire-gravel aggregate-geosynthetic material composite structure has strong foundation reinforcement and drainage functions, is applied to actual engineering, can improve the integrity and anti-scouring capacity of an engineering structure, and can solve the problem of environmental pollution caused by waste tires. And the composite structure is wide in applicability, high in repeatability and stable and reliable in structure, and an effective and reliable anti-scouring widening method is provided for application of actual engineering.

The invention provides a multifunctional geosynthetic material direct shear pull-out test device which comprises a test rack, the top of the test rack is fixedly provided with a shear box temperature control box used for placing an upper shear box and a lower shear box and controlling the internal temperature of a box body, and the shear box temperature control box is connected with a refrigeration control system; a workbench for mounting the upper and lower shear boxes is arranged at the bottom in the shear box temperature control box; a vertical loading device for providing vertical shearing force is arranged right above the shear box temperature control box, and a horizontal loading device for providing horizontal shearing force is arranged on one side of the shear box temperature control box; the horizontal loading device and the vertical loading device are fixedly connected through a reinforcing inclined rod; a conveying roller way is arranged on the opposite side of the horizontal loading device, and the tail end of the conveying roller way is in butt joint with the freezing and thawing cycle test box body. The device can be used for performing an interface friction test between a geosynthetic material and a soil body, a direct shear friction test and a drawing friction test are integrated into one device, and a shear box temperature control box and a cooling liquid temperature control box are arranged at the same time to jointly adjust the temperature of a sample.

The present application relates to the technical field of geosynthetic material, and more particularly to a geocell node connecting structure and method thereof, which comprises a belt body and two buckles in buckling connection, the buckle is provided with a boss and a groove, the groove is sequentially provided with a melting cavity and a negative pressure cavity from top to bottom, a pre-sealed fusible resistance flow film is arranged between the two cavities, and the bottom of the melting cavity extends laterally to have an expansion cavity. In the ultrasonic welding state, the end of the boss is heated and melted and instantaneously burns through the fusible resistance flow film, so that the negative pressure cavity in the sealed state is instantaneously penetrated. By using the generated negative pressure suction effect, the repulsive force generated by the thermal expansion of the plastic is actively offset, and the two buckles are continuously and closely driven to adhere. At the same time, the negative pressure force guides the high-viscosity molten material to flow laterally into the dead angle of the expansion cavity, and after cooling, a seamless T-shaped physical locking structure is formed. The present application completely solves the problems of traditional ultrasonic welding, such as rebounding and debonding, and filling of the reverse buckle, and greatly improves the tensile and peeling strength of the node.

The invention belongs to the field of geosynthetic materials, and discloses acid-resistant and high-temperature-resistant polypropylene composite cloth covering an electrolytic bath. The acid-resistant and high-temperature-resistant polypropylene composite cloth comprises silica gel fireproof cloth, polypropylene filament geotextile and a PTFE (Polytetrafluoroethylene) film which are sequentially laminated and compounded, when the acid-resistant and high-temperature-resistant polypropylene composite cloth covers the electrolytic cell, one side of the silica gel fireproof cloth of the acid-resistant and high-temperature-resistant polypropylene composite cloth faces the electrolytic cell to cover the electrolytic cell. The acid-resistant and high-temperature-resistant polypropylene composite cloth can resist erosion of acid chemical substances, and has the functions of sealing (preventing acid mist from overflowing), covering, heat preservation and protection at the same time.

The utility model discloses a highway subgrade slope reinforced earth retaining wall, which belongs to the technical field of road construction, and comprises a frame main body, the outer side wall of the frame main body is provided with a clamping groove, the frame main body is clamped with a retaining box through the clamping groove, the inner side wall of the retaining box is fixedly connected with a limiting rod, and the retaining box is detachably connected with a splicing cable through the limiting rod. The inner bottom of the blocking box is rotationally connected with a threaded rod, and the outer side wall of the threaded rod is in threaded connection with a moving block. According to the reinforced earth retaining wall for the highway subgrade slope, through the threaded rods, the moving blocks, the moving grooves, the limiting blocks, the limiting grooves, the pressing plates and the protruding blocks, the uniformity of the paving thickness of filler is conveniently improved, so that the surface flatness of the filler is improved, and the situation that the difference of earth pressure borne by a rib belt at different positions is increased is avoided; therefore, the situation that the rib belt part with large stress possibly reaches limit stress too early to be damaged, for example, the metal rib belt possibly breaks, the geosynthetics rib belt possibly loses strength due to excessive stretching, and the stability of the whole reinforced earth retaining wall is reduced is avoided.

This application discloses a method and apparatus for selecting geosynthetics based on the stability of a mine waste rock dump closure system, relating to the field of mine waste rock dump closure technology. It quantifies the stability of the closure system into a more reasonable anti-slip stability safety factor, providing a more scientific basis for geosynthetic material selection for the closure system. The method includes: determining the main tensile geosynthetics affected by the target contact surface; selecting at least two specifications of geosynthetics as candidates based on the characteristic indicators of the main tensile geosynthetics, and calculating the allowable tensile strength of different specifications of geosynthetics; calculating the anti-slip stability safety factor of the closure system using different specifications of geosynthetics using the double-wedge method; and comparing the anti-slip stability safety factor of the closure system using different specifications of geosynthetics with a standard safety factor to select a geosynthetic material specification that meets the stability requirements of the closure system.

The invention relates to the technical field of geosynthetic materials, and discloses a puncture-resistant and high-water-permeability composite geotextile and a preparation method thereof.The composite geotextile comprises a base cloth layer and a porous functional coating; the porous functional coating is formed by coating a functional coating solution containing a light-cured resin matrix, a water-soluble pore-foaming agent, aminated glass flakes and hydrophobic modified fumed silica, curing and eluting the pore-foaming agent. The preparation method comprises the following steps: coating the functional coating liquid on the base cloth layer in a high-shear manner, so that the aminated glass flakes are oriented in parallel; carrying out first curing treatment to gelatinize the surface of the coating so as to lock orientation; carrying out heat treatment on the gel-state material, and inducing thermally induced phase separation of the water-soluble pore-foaming agent by utilizing the affinity of the surface of the aminated glass flake to form a through network arranged along the glass flake; and finally, eluting and deeply curing to dissolve out the pore-foaming agent to form pores. Through a time-sharing control process and filler surface induction, high puncture strength and high vertical permeability are synergistically realized.

The invention relates to the technical field of geosynthetic materials, and discloses an anti-puncture drainage textile geotextile material based on stress regulation and a preparation method thereof, and the anti-puncture drainage textile geotextile material comprises a flexible anti-puncture control layer, a three-dimensional fiber drainage guide layer and a drainage filter layer which are sequentially arranged from top to bottom. And the flexible puncture-resistant control layer is formed by low-viscosity dipping-high-viscosity surface blade coating and ultraviolet curing. According to the composite geotechnical cloth, the bursting strength, the dynamic anti-perforation performance and the performance retention rate after abrasion are improved while a drainage channel is kept, and the composite geotechnical cloth is suitable for high-speed railway ballast beds, macadam roadbeds and geotechnical engineering structures bearing repeated dynamic loads.

The invention relates to the technical field of geosynthetic materials, and discloses a high-performance geotextile and a preparation process thereof.The high-performance geotextile takes polyvinyl alcohol and polyacrylic acid as polymer matrixes, and the interior of a fiber structure of the high-performance geotextile contains an inorganic mineral network generated through an in-situ reaction of sodium silicate and calcium salt; a polymer cross-linked network is formed through coordination of multivalent metal ions, and the two networks penetrate through each other to form a synergistically enhanced dual-network structure; the preparation process comprises the following steps: preparing the components into a spinning solution, and realizing synchronous implementation of fiber physical forming and inorganic phase in-situ generation through wet spinning; carrying out alkaline activation on the fiber to expose a reaction site, and treating with a multivalent metal ion solution to realize chemical cross-linking locking; a finished product is prepared through wet-process lapping. The problem that a polymer matrix is not water-resistant is effectively solved, and the prepared geotextile has high tensile strength, excellent water resistance and chemical corrosion resistance and high soil interface friction performance.

The invention belongs to the field of material testing, and particularly discloses a geosynthetic material durability accelerated test method, which comprises the following steps: S1, determining a dynamic coupling factor combination based on a service scene of a geosynthetic material, the combination comprising environmental factors and mechanical factors, the environmental factors at least comprising ultraviolet radiation, alternating temperature and a chemical medium, and the mechanical factors at least comprising ultraviolet radiation, alternating temperature and a chemical medium; the mechanical factor is cyclically changed mechanical stress; s2, in the same test period, synchronously applying the dynamic coupling factor combination to the geosynthetic material sample; s3, treating the sample in the dynamic coupling test environment for a preset time, and testing the performance index of the sample; by introducing the alternating temperature and the cyclically changing mechanical stress, thermal fatigue and mechanical fatigue existing in the actual service environment are reproduced in the test, so that the damage mode experienced by the material in the test is highly consistent with the real situation, and the life prediction result is more reliable and accurate.

The utility model provides a pull-out test system for testing the interfacial strength of a geosynthetic material and a building block, and the pull-out test system comprises a fixing unit which comprises a first fixing frame, a first positioning frame and a telescopic assembly; a containing space is formed in the first fixing frame, and the first positioning frame and the telescopic assembly are both located in the containing space and connected with the first fixing frame. The first positioning frame and the telescopic assembly are arranged in a spaced mode in the first direction, a limiting face used for limiting building blocks is formed on the side, close to the telescopic assembly, of the first positioning frame, and the telescopic assembly can stretch in the first direction so as to drive the building blocks located between the first positioning frame and the telescopic assembly to abut against the limiting face; the drawing unit and the fixing unit are arranged in a spaced mode in the first direction, the drawing unit comprises a clamp used for clamping the geosynthetics, the geosynthetics make contact with the building blocks, and the clamp can move in the first direction. The pull-out test system for testing the interfacial strength of the geosynthetics and the building blocks, provided by the invention, can reliably fix the building blocks.

This invention relates to the field of geotechnical engineering, specifically to a method for reinforcing calcareous sand based on a biomimetic tortoise-shell pattern geomembrane using layered embedding. This invention combines the biomimetic principles of tortoise-shell structures with modern geosynthetic material technology to construct a scientifically sound integrated "material-structure-process" solution, which is expected to provide a new technical approach for calcareous sand foundation treatment and promote the progress and development of marine geotechnical engineering technology.

The utility model discloses a kind of building geosynthetic material performance test benches, it includes test bench, the left side of test bench top is provided with display controller, by setting tensile test component and simulation mechanism, can realize tensile strength test and high temperature, low temperature, high humidity environment simulation in test box simultaneously, solve the defect that traditional test bench function single, cannot reflect actual working condition, wherein, tensile test component is located in the inside of test box can be clamped and stretched to its geotextile or geomembrane, test out basic tensile data, then again through semiconductor refrigerator and heating component cooperation can simulate-20 ℃ to 80 ℃ wide temperature range environment in its test box inside, humidity sensor and humidifying component linkage realize 30%-90%RH high humidity scene recurrence, temperature sensor, humidity sensor real-time monitoring and through display controller synchronous record data, make tensile strength test result and environmental variable one-to-one correspondence, effectively capture material performance attenuation law.

The utility model belongs to the technical field of detection devices, and particularly relates to a geosynthetic material bursting test sample clamping tool which comprises a base, a top frame, an upper ring and a piercing rod and further comprises a fixing mechanism, a plurality of groups of matched holes are formed in the upper ring and the lower ring, fixing pins are installed on the matched holes of the upper ring and the lower ring, and the upper ring and the lower ring are fixed through the fixing pins. A toothed ring is rotatably mounted on the lower ring, a plurality of cams matched with the grooves in the side walls of the fixing pins are rotatably mounted in the lower ring, and gears meshed with the toothed ring are mounted on the cams; by arranging the fixing mechanism, when a user rotates a gear ring, a plurality of gears meshed with the gear ring drive a cam to be screwed into a groove in the side wall of a fixing pin, the material fixing efficiency of the user is improved, a protrusion is arranged on the outer wall of the gear ring, the user can conveniently rotate the gear ring, and by arranging a fixing block and a groove matched with the fixing block, the material fixing efficiency is improved. And the stability of the fixing mechanism after the material is fixed is ensured.

The invention relates to the technical field of geotechnical synthetic material and building membrane material physical performance test equipment, and discloses a triaxial shear apparatus-based test instrument for testing bursting and puncturing strength of a membrane material, the triaxial shear apparatus-based test instrument comprises a computer, a data acquisition instrument and a support seat, the top of the support seat is fixedly connected with two lead screws, and the two lead screws are connected with a three-axis shear apparatus. An upper top seat is fixedly connected to the top end of the lead screw, a pressure detection assembly is arranged at the bottom of the upper top seat, a pressure circular top seat is slidably connected to the top of the supporting seat, a pressure cabin base is arranged at the top of the pressure circular top seat, and a groove is formed in the bottom of the pressure cabin base; the top of the pressure chamber base is fixedly connected with a plurality of disc supporting cylinders. According to the invention, the existing triaxial shear apparatus is used as a main body frame, and a waste triaxial pressure cabin is transformed into a membrane material clamp, so that a laboratory does not need to additionally spend expensive funds to purchase a special bursting and puncturing tester, the test range of the original triaxial shear apparatus is directly expanded, and the equipment purchase expenditure is effectively saved.

The utility model belongs to the technical field of civil engineering, and particularly relates to a geosynthetic material hydrostatic pressure resistance tester which comprises a hydrostatic pressure resistance tester body, an electric push rod is fixedly connected to the interior of the hydrostatic pressure resistance tester body, and the output end of the electric push rod penetrates to the exterior of the hydrostatic pressure resistance tester body. A connecting frame is fixedly connected between the two electric push rods, an annular connecting seat is fixedly connected to the connecting frame, a first magnetic plate is arranged on the annular connecting seat, telescopic connecting rods are fixedly connected to the two sides of the first magnetic plate, and the other ends of the telescopic connecting rods are fixedly embedded in one side of the annular connecting seat; a second magnetic plate is fixedly connected to the interior of the electric push rod; in the long-term use process, the tight fitting degree between the first magnetic plate and the sealing groove is not affected by material aging, a good sealing state is kept for a long time, and the situation that the transparent sealing cover leaks water, and the test result is affected badly is avoided.

A visual pull-out device and testing method for geosynthetics based on cyclic loading are disclosed. The device includes a rigid reaction frame and a test chamber disposed within the reaction frame. At least one side wall of the test chamber is a transparent observation wall. One end of the test chamber is equipped with a pull-out clamp for holding the geosynthetics, and the other end is a free end. The pull-out clamp is connected to a servo loading system capable of controlling the pull-out rate. The top of the test chamber is equipped with a normal loading system capable of applying static and cyclic loads. The device also includes a data acquisition system and a visual image acquisition system, the image acquisition system including a high-speed camera positioned in front of the transparent observation wall. The invention also provides a testing method based on this device. This invention can effectively overcome size effects, achieve visual observation and quantitative analysis of the pull-out process, and accurately obtain macroscopic and microscopic mechanical parameters of the reinforcement-soil interface, providing a reliable basis for the design and theoretical research of reinforced soil structures.

The composite geosynthetic fabric includes a woven fabric and a nonwoven fabric bonded to the woven fabric. The nonwoven fabric includes a plurality of fibers, each of which has a denier of about 2 to about 18 (about 2.2 to about 20.0) decitex per filament. Some of the fibers of the nonwoven fabric extend through the woven fabric and are fused together on a surface of the woven fabric opposite the nonwoven surface of the woven fabric.

The invention relates to the technical field of geosynthetic material testing, and discloses a test device and a test method for a vertical permeability coefficient of a drain board filter membrane, the test device comprises a sample sealing system, a pressurization system, a water supply system, a water pressure difference measurement and control system, a seepage water measurement and control system and a data processing module; the data processing module is configured to obtain water head difference, flow and time parameters so as to calculate the vertical permeability coefficient of the filter membrane of the sample piece. According to the invention, the composite in-situ test of the drain board filter membrane can be realized; the test sample sealing system is matched with the pressurizing system, so that the test can be directly carried out on a complete drainage plate without stripping a filter membrane; the combination of the water pressure difference measurement and control system and the seepage water measurement and control system realizes the automatic monitoring of water head difference and flow, the calculation is implemented through the data processing module, the accuracy and efficiency of the test are improved, and the test result can truly reflect the seepage performance of the filter membrane in the actual working state.

The utility model belongs to the technical field of testing machines for testing the strength characteristics of solid materials by mechanical stress, and provides a dynamic single-shear direct-shear testing device for large-size geosynthetics, which comprises an upper shear box, a lower shear box, a lower shear box and a lower shear box, and upper spike teeth are uniformly distributed on the lower surface of the upper shear box; the vertical load mechanism is connected with the upper shear box; the lower shearing box is arranged below the upper shearing box, a circle of smooth plane is arranged on the outer edge of the upper surface of the lower shearing box, and lower spike teeth are uniformly distributed in the middle of the lower shearing box; the horizontal load mechanism is connected with the lower shear box; the displacement measuring mechanism comprises a plurality of displacement measuring units, each displacement measuring unit comprises a hollow stacked ring and a displacement meter, the stacked rings of all the displacement measuring units are stacked on the smooth plane of the lower shear box, hollow areas in the stacked rings correspond to the positions of the lower spike teeth, and the displacement meters are connected with the stacked rings in a one-to-one correspondence mode. According to the utility model, the displacement and shear strength of each layer of geosynthetics of the composite liner system can be measured.

The utility model relates to the field of water pressure measurement, in particular to a geosynthetic material hydrostatic pressure resistance tester convenient for water level adjustment, which comprises a bearing support column, a sealing pressure measurement component for fixing and limiting a material and a pressurizing water level adjustment component for adjusting the water level of an experimental material, the sealing pressure measurement assembly comprises a working bottom plate, a limiting placement frame, a test box, an observation plate, an extension clamping ring, a pressure detector, a data transmitter, an air pressure stabilizer, a rubber damper, a telescopic spring, a clamping limiting plate, a detection material, a sealing tank cover, a rubber sealing plate, a first locking plate, a second locking plate and an adjusting lock catch; a working bottom plate is fixedly welded to the upper end of the bearing supporting column. The testing device can simulate hydrostatic pressure borne by the geosynthetic material in actual engineering so as to evaluate the waterproof performance and durability of the geosynthetic material, provides experimental data for research and development of the novel geosynthetic material, ensures the accuracy of a test result, and improves the test efficiency.