381 results about "Direct shear test" patented technology

A direct shear tester for both portable field test and indoor test and a sampling and testing method are provided. The tester comprises a sampling device, a portable vertical load system and a horizontal shear system. The testing method comprises burying a rigid frame together with a cruciform shear frame in the soil of a place to be test, digging out the whole soil containing the rigid frame and the cruciform shear frame to obtain an integrated sample with less interference, placing and fixing the integrated sample in a rigid frame base on a box-shaped frame, applying a vertical force by using the portable vertical load system on the box-shaped frame, and measuring the strength of the sample by using the shear frame. During the test process, the volume change of the sample in the vertical direction is not limited. The tester has simple structure, easy operation and good portability. The testing method employs flexible tension shear mode instead of the rigid top-bunt shear mode, overcomes the friction and sampling problems, and avoids the vertical pressure offset during the test process by using the portable vertical loading system, thereby increasing the test accuracy.

The invention discloses a direct shear testing device of saturated rock soil samples, which relates to the technology of mechanical strength test of rock soil. The structure of the direct shear testing device comprises a sample shear box, a loading system, a saturation system, a vacuum pump and a data acquisition system which are fixed on a frame to form a whole body, wherein the shear box is arranged in a water channel of the saturation system and guarantees the sample to be saturated completely, the loading system comprises a vertical loading system and a transverse loading system, the vertical loading system and the transverse loading system are respectively connected with the shear box and realize vertical loading and transverse loading of the shear box, the vacuum pump is connected with the saturation system and used for vacuumizing the closed water channel, and the data acquisition system is connected with the shear box and the loading system respectively and used for monitoring and recording the force and the displacement of the shear box. The direct shear testing device realizes direct shear tests of small-size and medium-size gravel soil, crack soil and soft rocks, and particularly can realize site tests of samples on the construction site and reciprocating direct shear tests of saturated rock soil.

The invention relates to a method for manufacturing a direct shear test structural plane model. The method comprises the following steps of: (1) the selection and the processing of a virgin rock structural plane: selecting a virgin rock structural plane to be used as a sample, and leveling an original structural plane of the rock mass; then coating a mould release agent at a selected position determined according to the specific size of a structural plane model, and spreading an isolating membrane; (2) putting a lower mould on the selected position of the original structural plane, and pouring a uniformly stirred mixed material into the lower mould; after carrying out water retention maintenance on the sample, turning over a lower disk structural plane sample together with the lower mould, and removing the used isolating membrane on the lower disk structural plane; (3) coating the mould release agent on the prepared lower disk structural plane, and spreading the isolating membrane; centering and putting an upper mould on a lower mould, and then pouring a uniformly stirred mixed material of weighed raw materials into the upper mould again; and (4) demoulding. The method has specific principle, strong maneuverability, low cost and good use effect.

The invention discloses a large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests. The machine comprises a measuring and controlling unit (1), a hydraulic servo unit (2), a loading unit (3) and a soil sample preparing unit (4). The loading unit (3) comprises a Z-direction vertical loading frame, an X-direction horizontal loading frame and a Y-direction horizontal loading frame, the three frames are perpendicular to each other, and the three frames all have independent loading ability. The hydraulic servo unit (2) comprises an X-direction horizontal loading actuator (311), a Y-direction horizontal loading actuator (312) and a Z-direction vertical loading actuator (31). The measuring and controlling unit (1) is in separate communication connections with three electro-hydraulic servo loading cylinders of the hydraulic servo unit (2). The large bidirectional dynamic/static direct-shearing machine is used in coarse-grained soil shearing performance tests, coarse-grained soil shearing performance tests on reinforced contact interface and coarse-grained soil shearing performance tests on concrete interface under the dynamic/static loading effects of simulation traffic loading.

The invention provides a portable rock mass structural plane direct shear test apparatus for field and indoor use. The apparatus comprises a sample preparation shear box and a shear test device. Specifically, the sample preparation shear box is mainly composed of a shear box housing, mould stripping pieces fixed by knobs and the shear box housing, and clamping pieces positioned at the ends of fixation screw rods that are mounted on the mould stripping pieces; the shear test device mainly consists of a shear test device outer frame, a vertical bearing plate, a horizontal pressure bearing instrument, sensors and jacks, with the vertical bearing plate mounted at the upper part of the shear test device outer frame and between a sensor and a jack, and the horizontal pressure bearing instrumentdisposed on a rolling shaft unit in the shear test device. Used in field or indoor rock mass structural plane direct shear tests, the apparatus of the invention can save sample preparation time, thusbeing suitable for rapid structural plane direct shear tests. The apparatus provided in the invention can improve the accuracy and convenience of structural plane direct shear tests, and has the advantages of simple structure, easy manufacturing, convenient operation and low cost, etc.

The invention discloses a movable plate stacking ring shearing apparatus capable of adapting to free shearing deformation and belongs to the mechanical characteristic test equipment. The movable plate stacking ring shearing apparatus comprises a bracket, a lower shearing box, a stacking ring set shearing box, a vertical loading unit, a horizontal loading unit and a measuring unit, wherein the bracket consists of a bottom plate and a stand column; the lower shearing box and the stacking ring set shearing box are stacked between the bottom plate and the vertical loading unit in sequence; the vertical loading unit is fixed on the stand column; the horizontal loading unit is fixed on the bottom plate. According to the movable plate stacking ring shearing apparatus capable of adapting to free shearing deformation, a movable plate shearing frame capable of adapting to free shearing deformation can be used for performing a simple shear test and a direct shear test and also can be used for performing a pull-out test on geogrid, geotechnical cloth and the like. When the simple shear test is performed, the vertical loading unit can provide three normal boundary conditions of normal displacement, normal rigidity and normal stress, and the horizontal loading unit can be used for providing horizontal shearing force. The movable plate stacking ring shearing apparatus is delicate in design, convenient to operate, easy to assemble and disassemble, and capable of precisely performing research on shearing deformation characteristic between contact surfaces of geotechnical materials and structures.

The invention discloses a rock and earth mass in-situ direct shear test device with an automatic data acquisition system and a rock and earth mass in-situ direct shear test method and relates to a rock mechanical test technology. A rock and earth mass test sample can be subjected to shear failure on a proposed shear surface by applying a normal load and a horizontal shear force to the test sample, and the automatic data acquisition system is used for recording relevant data such as shear stress and displacement in a test process. The test device comprises the test sample (00), a shear box (10), a reaction system (20), a perpendicular pressure system (30), a force transmission system (40), a tangent pressure system (50), a roller row (60) and an automatic data acquisition system (70). By adopting strain control, the rock and earth mass in-situ direct shear test device is high in measurement precision and high in stability; the rock and earth mass in-situ direct shear test device is provided with the automatic data acquisition system; a spoke sensor is used through stress control, so that stress can be precisely measured; all components can be detached, so that the rock and earth mass in-situ direct shear test device is convenient to transport and mount.

The invention relates to a tensile-shearing test system for rock experiments in mechanics and belongs to the technical field of geotechnical engineering. The test system comprises a counter-force device, a vertical load system, a horizontal load system, upper and lower shearing boxes, a measurement system and a base, wherein the vertical load system and the upper shearing box are connected through a tensile plate of which the lower end is provided with two guide slots. The direct shear test for the rock under different tensions can be performed; due to the assembled design of the upper and lower shearing boxes, the rock sample can be conveniently adhered and detached; due to the design mode of the tensile plate and the upper shearing box, free deformation of the rock in the horizontal direction under the horizontal thrust can be guaranteed, and the stability of the horizontal load system under the tensile action can be guaranteed according to the roller row which is arranged in the horizontal load direction. The current situation that the strength criterion of the rock can only be researched by employing the compression shear experimental mode at present is changed, the intensity parameters of the rock under the action of different normal tensions can be provided, and the constitutive relation of the rock under the shear-resistant stress is improved and perfected.

The invention relates to a temperature control pile-soil interface direct shear test device which comprises a portal frame, a lateral constant stiffness loading system, a pile-soil interface simulation system, a water circulation temperature control system, a normal loading system and a data collection system. The portal frame mainly provides a counter-force supporting point for the other systems. The lateral constant stiffness loading system comprises a counter-force frame, a spring fixing plate, a spring, a spring guide rod and a loading plate; the pile-soil interface simulation system comprises a pile lateral soil body box and a pile body box; the water circulation temperature control system comprises a constant temperature water tank, a heater, a refrigerator, a circulating water pump, a water guiding pipe, a valve, a flow meter and a temperature sensor; the normal loading system mainly refers to server hydraulic loading. According to the device, pile-soil interface addition temperature stress monitoring testing, hot and cold cycle after-construction pile-soil interface shear-resistance change rule testing and other testing during temperature field changing can be performed, and then energy pile load-carrying performance impact factors are analyzed.

The invention discloses an assembled size-changeable double-face shear apparatus for performing a direct shear test on various size-changeable rock test samples. An upper shear box, a lower shear box and a middle shear layer are assembled size-changeable test sample box sleeve pieces consisting of stacked test sample box rigid components; each test sample rigid component comprises a plurality of embedded sample accommodating rings; the inner side sample accommodating rings is axially limited by the outer side sample accommodating rings in one direction; the rigid components forming the upper shear box and the lower shear box respectively are anchored together; rolling supporting matched structures are arranged on the outmost side sample accommodating rings of the rigid components in the upper shear box and the lower shear box; water drainage slots are formed in the sample accommodating rings at the bottom of the lower shear box; and the water drainage function is shut down according to a test requirement. The assembled size-changeable double-face shear apparatus can perform the double-shear-face direct shear test on a soil sample and soft rock, and a lateral-restrict-free single-shaft compression test on hard rock is easy to operate, convenient to maintain and detachable, has high environmental adaptability, and is suitable for being used in indoor and outdoor rock direct shear compression tests.

The invention relates to a rock-soil body shear creepmeter considering a dry-wet cycle and a test method thereof. The invention aims to provide the rock-soil body shearing creepmeter considering the dry-wet cycle with a simple structure and convenience in operation, and the test method thereof. Not only can a shearing creep test of a soft rock or hard soil during a dry-wet cycle process be carriedout, but also a direct shearing test of the soft rock or the hard soil under a dry-wet cycle action can be also carried out. The rock-soil body shearing creepmeter considering the dry-wet cycle is characterized by being provided with a bottom plate, wherein a driven shearing box with an upward opening is arranged on the bottom plate; a rock-soil sample is placed in the driven shearing box; a drive shearing box with a downward opening is arranged above the driven shearing box, and is arranged on the rock-soil sample in a covering way. The rock-soil body shearing creepmeter considering the dry-wet cycle and the test method thereof provided by the invention are applicable to testing mechanical parameters of the soft rock or the hard soil in a dry-wet cycle environment.

The invention discloses a preparation device of random oriented multi-set joints rock bridge samples. The preparation device comprises I-shaped guide rails, a dead plate, L-shaped supports, angle control devices and insert devices. The lower part of the preparation device is composed of two parallelly-arranged pairs of I-shaped guide rails and rod pieces. A square formed by the I-shaped guide rails and the rod pieces has the same inner diameter as a sample box. The L-shaped supports are nested in the I-shaped guide rails. The angle control devices are fixed on the L-shaped supports. The insert devices are fixed on the angle control devices through fastening screws. Thus, all the above components together form a basic structure of the device. In comparison with the prior art, the invention has the following advantages: the device is practical and simple, and can manufacture multi-sets of joints; manufactured samples can be used in direct shear tests and true triaxial tests; and the device is convenient to use, has high precision and high practicability, and is adopted to achieve objectives of really stimulating joints, enhancing work efficiency, reducing experimental errors, optimizing test results and solving practical engineering problems.

The invention relates to a manufacturing mold of a structural surface model in a direct shear test, which comprises an upper disk mold, a lower disk mold and a positioning pin, wherein the upper disk mold is positioned on the lower disk mold; the positioning pin for centering the upper disk mold and the lower disk mold is arranged on the bottom surface of a side plate of the upper disk mold; the upper disk mold comprises an upper front side plate, an upper left side plate, an upper back side plate and an upper right side plate; the cavity shape formed by the upper disk mold is matched with the structural surface model of the upper disk to be manufactured; the upper front side plate is fixedly connected with the upper left side plate and the upper right side plate, and the upper back side plate is fixedly connected with the upper left side plate and the upper right side plate; the lower disk mold comprises a lower front side plate, a lower left side plate, a lower back side plate and a lower right side plate; the cavity shape formed by the lower disk mold is matched with the structural surface model of the lower disk to be manufactured; and the lower front side plate is fixedly connected with the lower left side plate and the lower right side plate, and the lower back side plate is fixedly connected with the lower left side plate and the lower right side plate. The manufacturing mold of the invention not only has the advantages of convenient operation, high speed and high accuracy but also can be used for manufacturing multi-scale structural surfaces of which the upper disks and the lower disks are completely matched.

The invention discloses a direct shear tester for field undisturbed soils, which comprises a shear device, a vertical loading device and a horizontal loading device, wherein the shear device comprises a lower shear box and an upper shear box arranged on the lower shear box in a sliding fit mode; the vertical loading device comprises a loading container I and a force transmission component I for carrying out vertical loading on soil bodies; and the horizontal loading device comprises a loading container II and a force transmission component II for carrying out horizontal loading on the upper shear box; and when in use, the upper shear box and the lower shear box are sleeved around the tested undisturbed soils, then just enough soils and rocks are arranged around the lower shear box so as to fix the lower shear box, the loading container I and the loading container II are respectively filled with field soils and rocks, and shear strength testing is performed on the field undisturbed soils so as to determine the shear stresses of the undisturbed soils under different vertical pressures, thereby deeply learning the changing rule of some mechanical properties of the undisturbed soils so as to provide a theoretical basis for analyzing the stability of a later-stage waste disposal site and designing the emission scheme of chats.

The invention provides a method for measuring shearing area of a rock structral plane in a direct shear test. The method comprises the following steps of: collecting an image; cutting and filling the image; converting the image into a grayscale image; selecting a gray threshold according to the obtained grayscale image of the rock structral plane; converting the grayscale image of the rock structral plane into a black and white binary image on the basis of the selected gray threshold; calculating percentage, namely percentage of the shearing area of the rock structral plane in the direct shear test, of the area of a white part in the area of the whole image; figuring out total actual area of the rock structral plane through using a graduated scale adopted during shooting as a reference object; and figuring out the shearing area of the rock structral plane in the direct shear test. According to the invention, defects of complicated operation, complicated steps, low working efficiency, large manual error and the like in the traditional measuring method can be solved; moreover, as the operation is simple, an important practical significance is obtained in reducing workloads of geologists, improving measuring accuracy and increasing working efficiency; meanwhile, as lower cost is achieved, the method for measuring the shearing area of the rock structral plane in the direct shear test, provided by the invention, is easy to be popularized.

The invention discloses a multi-step vertical shearing testing method in a soft soil chamber, which is characterized in that 1) N samples of a same soil sample are arranged in the shearing box of the soft soil chamber; 2) first-step normal load Sigma1 is acted on the N samples simultaneously; under the normal load, a shearing force vertical to the normal load Sigma is acted on the sample; furthermore, respective shearing stress peak values, Tau<1-1>, Tau<1-2>, Tau<1-3>, ellipsis, Tau<1-N>, are respectively recorded; subsequently, all normal loads are unloaded and quickly retrieved; 3) the step 2) is repeated; the second-step normal load Sigma2, the third-step normal load Sigma3,..., the M-step normal load Sigma<M> are acted on the N samples simultaneously, thus obtaining M groups of shearing stress peak values, Tau<M-1>, Tau<M-2>, ellipsis, Tau<M-N>; 4) to the M groups of normal load Sigma<M> and the shearing stress peak values Tau<M-1>, Tau<M-2>, Tau<M-3>, and Tau<M-N> of each sample, according to a formula that Tau<M-N> is equal to c<N>+Sigma<M>tanPhi<N>, the anti-shearing strength parameters, c<N> and Phi<N> of the sample are obtained; and 5) the average value of the anti-shearing strength parameters of the N samples are used as the anti-shearing strength parameter value of the group of soil samples. The method has the effects of saving testing sample resource and has concentrative and exact testing results.

The invention relates to a direct shear test data acquisition instrument for a big visual model of reinforced earth. The direct shear test data acquisition instrument comprises a vertical loading system, a horizontal loading system and a shear box, wherein the shear box comprises an upper shear box and a lower shear box which are both filled with packing; the horizontal loading system comprises a push-pull electromotor and a sliding balanced pushing rod, and a displacement sensor and a pressure sensor are mounted on the push-pull electromotor; one end of the sliding balanced pushing rod is connected with the push-pull electromotor, and the other end of the sliding balanced pushing rod is connected with the lower shear box; a counterforce device is mounted on one side, far away from the sliding balanced pushing rod, of the lower shear box and connected with the upper shear box; transparent tempered glass is arranged on one side wall of the upper shear box in the shear direction, and a digital video camera is mounted in front of the tempered glass; a geotechnical material spring clip is mounted at one end of the lower shear box. The direct shear test data acquisition instrument is convenient to use, small in test error, precise test data and convenient to widely promote and use.

The invention discloses a large-scale direct shear apparatus between geo-technic synthetic materials and between the geo-technic synthetic materials and the earth, which comprises a lower shearing box, an upper shearing box and a pressure plate, wherein a central line of the upper shearing box is aligned with a central line of the lower sharing box; and the periphery of the pressure plate is matched with the inside of the upper shearing plate; an II-shaped plate frame is placed in the lower shearing box; and stainless steel gaskets with different thicknesses and different numbers are placed under the II-shaped plate frame according to different heights of testing materials; and two internal baffle plates can be placed in the upper shearing box or an upper shearing plate is placed in the upper shearing box according to the types of the testing materials. The modified shearing boxes disclosed by the invention solve the problem that a direct shearing test on the geo-technic synthetic materials and particle materials or between the geo-technic synthetic materials can not be carried out at the same time in the prior art. Because of reasonable structure and simple and convenient operation, the direct shear apparatus can be applied to rigid direct shearing test and a flexible direct shearing test between the geo-technic synthetic materials and the particle materials, and between the geo-technic synthetic materials, can ensure that the effective shearing area is invariable, the testing materials are uniformly stressed, and the shearing boxes are tightly adhered to test samples in the test process, improves the accuracy of the test achievements and greatly improves the utilization ratio of the test device.

The invention relates to a multi-scale soil-rock-mixture-bed rock interface shearing mechanical characteristic test device. The multi-scale soil-rock-mixture-bed rock interface shearing mechanical characteristic test device comprises a test piece system, a balance control system, a loading system, a servo control system and a data acquisition system, wherein the servo control system is used for controlling the loading system to work; the data acquisition system is used for acquiring image information of an multi-scale soil-rock-mixture-bed rock interface through the whole process of shearing,perpendicular loading force and displacement as well as shearing; and the test piece system comprises an upper rectangular tempered glass shearing box used for filling a soil-stone-mixture sample, a lower rectangular steel shearing box for filling a rock sample and a loading plate. The multi-scale soil-rock-mixture-bed rock interface shearing mechanical characteristic test device can realize research on shearing mechanical characteristics of soil-rock-mixture-bed rock interfaces of various dimensions and complex interface properties, meets straight shearing test requirements of base rock interface shapes under different kinds of perpendicular stress, different rock content and different moisture contents, and further can take effects such as erosion and softening, on the interface, of water into consideration.

The invention relates to a multi-dimensional transformation system of a direct-shear test instrument of large-sized rock mass structure faces, which comprises n bottom shim plates and n side shim plates, wherein the n bottom shim plates are sequentially superposed from top to bottom according the area size to form a bottom shim plate assembly. The bottom surfaces of samples at the upper part and the lower part of the bottom shim plate assembly contact in a stress way, the lower part of the bottom shim plate assembly contacts with a frame in a stress way, and the centroids of each bottom shim plate, the sample at the upper part and the sample at the lower part are positioned on the same upright straight line; the side shim plates are positioned at the side face of the sample at the lower part and are arranged on steps between the adjacent bottom shim plates and steps between the bottom shim plate at the lowest part and the frame, the top surface of each side shim plate is positioned on the same plane, and the same plane is lower than a connection face between the sample at the upper part and the sample at the lower part; and the side shim plate which is farthest away from the side face of the sample at the lower part contacts with the frame in a stress way. The invention can carry out direct-shear test on the shearing strength of structure faces with different dimensions so as to obtain the change rule and the stable threshold value of the size effect of the shearing strength of the structure faces.

Disclosed is an apparatus for preparing and testing a soil-rock interface sample for an on-site direct shear test. The apparatus comprises two guiding rail supports arranged in parallel, tripods are arranged on the guiding rail supports, sleeves are arranged at the top parts of the tripods, and telescopic rods are connected to upper ends of the sleeves and connected to a top plate through sleeves. A hydraulic jack is vertically arranged below the top plate and connected to a load-transfer support, and the lower end of the load-transfer support is connected to a shear box which is a tetragonal frame made from four peripheral side faces. The invention provides a self-stabilized soil-rock interface on-site direct shear apparatus integrating sample preparation, loading and shearing into one body and a use method of the apparatus.

The invention discloses a method for determining the shear strength of chemically polluted soil and a special full-automatic direct shear apparatus. A chemical corrosion device is added for the direct shear apparatus compared with the prior art, infiltration holes are formed in the bottom of a shear box, and a notch groove is formed in the bottom of a container trough of the chemical corrosion device, so that when the method is adopted for determining, a chemical corrosion solution can be directly injected into the container trough to perform sealed maintenance; after maintenance is completed, vertical pressure loading is directly performed to complete a full-automatic direct shear test so that the pollutant corrosion situation of a soil body on site can be simulated, destroying-free maintenance of a tested soil sample is achieved, the influence of stress release in the sampling process is avoided, disturbance suffered by the soil body is reduced as far as possible, and the tested sample can be closer to the in-situ soil sample in property. In addition, due to the fact that the infiltration rate fluctuation of the chemical corrosion solution is smaller, a result is closer to the polluted situation of natural soil, corrosion distribution can be relatively uniform, the influence of local corrosion on the mechanical property determination of the soil sample is avoided, and the problem that a conventional direct shear apparatus cannot detect the shear strength and parameters of the chemically polluted soil is solved.

The invention discloses an in-situ direct shear tester for soil bodies. The in-situ direct shear tester comprises a steel frame, a vertical oil cylinder, a cylinder, a horizontal oil cylinder and a push bowl, wherein the vertical oil cylinder is arranged on the steel frame; the cylinder can be horizontally and movably arranged at the power output end of the vertical oil cylinder; the horizontal oil cylinder is arranged on the steel frame; the push bowl is arranged at the power output end of the horizontal oil cylinder, and used for exerting a horizontal thrust on the cylinder, and enabling the cylinder to move a predetermined distance; and the horizontal oil cylinder is also provided with a displacement sensor for measuring the displacement and a first pressure sensor for measuring the thrust, and the vertical oil cylinder is also provided with a second pressure sensor for measuring the lateral pressure. According to the in-situ direct shear tester, the vertical oil cylinder and the horizontal oil cylinder are adopted for automatically and gradually exerting horizontal and vertical loads, and then the cohesion, internal friction angle standard value and pressure-deformation curve of a soil body are obtained by using a shear test; and the tester is accurate in testing, flexible to operate and reliable in result.

The invention discloses an unsaturated soil direct-shear test device with a function of controlling the suction by the negative pore water pressure. The unsaturated soil direct-shear test device comprises a direct-shear apparatus, a soil body water content change measurement system, and a positive and negative pressure conversion system, wherein the soil body water content change measurement system is composed of a dryer, a water container and a weight sensor; the positive and negative pressure conversion system is composed of a positive pressure control meter, a negative pressure control meter, a pressure converter and an air compressor; the loading system comprises a vertical load loading system and a horizontal load loading system; and the bottom surface of a lower shear box and the upper surface of a base oppositely slide in parallel through a sliding pair. By using the unsaturated soil direct-shear test device disclosed by the invention, a natural state of an unsaturated soil body is really reproduced when the suction is controlled; the effect of the suction of unsaturated soil on the shearing strength can be accurately tested; and meanwhile, the structure of the common unsaturated soil direct-shear apparatus at present is simplified. The unsaturated soil direct-shear test device disclosed by the invention is simple in structure, convenient to operate and easy to grasp.

The invention provides an apparatus and method capable of simulating action of a soaking-air drying cycle and used for direct shear test of soil. The apparatus comprises a testing stand, an air-water exchanger and a support, wherein the air-water exchanger is connected with a water storage tank through a pipeline, the water storage tank is communicated with a water storage groove pm the testing stand via a water inlet pipe, and the testing stand is installed on the support. In a shearing device on the testing stand, the two interior side surfaces, located at a non-shear displacement direction, of the water storage groove are provided with heating plates; the heating temperature and time of a temperature sensing and controlling instrument are set to control the process of heating and drying of a soil sample by the heating plates; and the air-water exchanger communicated with the water storage tank realizes monitoring and measurement of water pressure in the water tank by converting air pressure into hydraulic pressure. The apparatus can directly carry out drying-wetting cycle operation and related direct shear test on a soil sample in a shearing box, avoids tedious manual operation, improves testing efficiency and reduces errors brought by manual operation.