279 results about "Soil mechanics" patented technology

The invention relates to a soil slope water flow erosion resistance simulation test method and device. The device comprises a liftable slope simulation device, a sheetflood scouring simulation device, a water and soil collecting device, a flow velocity determining device and a slope surface form camera device. According to the test method, the water flow is controlled, surface flow and seepage are formed, and sheetflood water, seepage water and sediment quantity formed by scouring slopes by sheetflood water are collected. The flow, the flow velocity, the erosion depth, the sand yield and the like of the water flow are measured quantitatively. Compacted soil is soaked in water until saturation for simulation, the efficiency of an indoor simulation test on slope scouring is improved, the test period is shortened, the test result proves the maximum depth of a slope erosion gully and the change rule of the sand yield with time, discloses the relation between the water flow erosion capacity of catchment behind slopes and the slope length, gradient and time and provides a basis for prediction of the water flow erosion scale and the need of slope protection and reinforcement. The device is simple in structure, convenient to operate and suitable for measurement of soil mechanics parameters of slope soil mass.

A slope monitoring and early warning system based on deformation data comprises a plurality of surface displacement devices and a communication base station. The surface displacement devices send collected data information to the communication base station, and data interaction is carried out between the communication base station and a far-end monitoring center. According to a slope monitoring and early warning method based on the deformation data, a slope stability computational formula is deduced according to measured point displacement values and angle deviation values through analysis on a slope deformation instability mechanism based on theories of rock and soil mechanics. Dangerousness states on a slope are judged according to slope stability coefficient indexes, and therefore dangerousness classification on the slope can have fixed indexes and standards. The slope monitoring and early warning method based on the deformation data is different from the existing displacement-time method that different slopes have different early warning displacement values.

The invention discloses a device and a method for a physical simulation test of the stability of a deep tunnel surrounding rock and relates to a rock-soil mechanic technology. A structure of the device is that a pressure plate is covered on a sample in a deep tunnel rock body model instrument, and a vertical pressure system is arranged on the pressure plate and used for loading so as to simulate and exert gravity stress. A miniature shield machine drills into the sample from a drilling surface, and the miniature shield machine, a stepless speed changing box and a motor are sequentially connected to achieve drilling. Eight optical fibers and six strain gauges are distributed in the sample, the optical fibers are connected with a distributed optical fiber monitoring system, and the distributed optical fiber monitoring system and the strain gauges are respectively connected with a data acquiring system so as to achieve detection and recording. By means of the device and the method for the physical simulation test of the stability of the deep tunnel surrounding rock, a development and change law of stress strain when a deep tunnel rock body is excavated in tunnel construction can reappear accurately, and a novel solving path for researching the stability of the grotto surrounding rock and forming mechanism of rock burst in the tunnel construction.

The present invention relates to a model test device, and specifically to a frozen soil mechanics model test device. The invention is characterized in that the frozen soil mechanics model test device has a full-steel box type structure which comprises a heat insulation box body, a baseboard temperature controller, a water supplying device, a loading device and a data collecting and processing device. The device adopts a welding mode for connecting to a whole, and only one side plate adopts bolt connection, wherein, the baseboard structure of heat insulation box body comprises a heat insulationbaseboard, a water supplying pool and a top plate of water supplying pool. The structure gives attention to the functions of water supplying and temperature control. The water supplying device comprises a water level controller, the water supplying pool and a water supplying pipeline device. The charging device comprises a hydraulic jack and a hydraulic oil pump. The data collecting and processing device comprises a DT500/600 series data collector, a XSL series temperature measuring instrument and various types of sensors. The device of the invention has the advantages of realizing unidirectional and bidirectional freezing condition, realizing the water supplying of water migration in freezing process, providing the load of model test load application damage, monitoring the temperature field and stress field of frozen soil, monitoring the frost heaving, subgrade settlement deformation, etc.; and realizing the automatic collection and analysis of test data in the test process.

Design manufacturing and application of a triaxial penetration tester of the invention breaks through the limitation of permeability coefficient testing in Standard for soil test method GB/T50123-1999 and Specification of soil test SL237-014-1999. According to the invention, the tester is designed based on a varying-head principle; with water head with a height of up to 47 m provided by an air compressor, a constant head can be used to process the test results. Coarse grained soil and fine grained soil can be calculated both by a constant head and by a varying head, and the results are of the same order of magnitude and are quite close to each other. The tester of the invention comprises an air compressor, a penetration tester frame, a triaxial penetration pressure chamber, a liquid level sensor, a test data collector and a receiver, a data processing software, and a computer. Data are read on-line, are stored automatically, and samples of 10-9 cm/s or lower can be tested. The tester of the invention can test permeability coefficients of undisturbed soil, disturbed soil, and additive mixtures of soil and cement. The sample preparation method is simple and practical; the test is rapid and convenient, and covers the application fields which require permeability coefficient testing in soil mechanics or materials science.

The invention discloses a production method of an artificial experimental sample imitating a natural crack rock sample and belongs to the technical field of rock and soil mechanics experiments. According to the production method, the natural crack rock sample is subjected to 3D scanning to obtain geometric data of a crack surface, and the geometric data is processed and computer three-dimensional modeling is carried out on the basis to obtain a computer three-dimensional model of a crack surface mold. Meanwhile, the computer three-dimensional model of a pouring box matched with the size of three-dimensional modeling software is established in the three-dimensional modeling software. A 3D printing technology is used for rapidly producing real objects of the crack surface mold and the pouring box in a large batch; and finally, the artificial experimental sample used for an indoor experimental research is obtained. The production method of the artificial experimental sample imitating the natural crack rock sample, disclosed by the invention, has the characteristics of high molding quality, short production period, low production cost and no pollution and no damages on the natural crack rock sample, and can be widely applied to the production of the artificial experimental sample of indoor experiments for researching the characters of crack rock bodies.

The invention discloses a straight cut testing system for rock and earth mechanics, relating to a cutting system. The invention is composed of outer frame, horizontal loading system, vertical loading system, cut box, and measuring system; the horizontal loading system, the vertical loading system, the cut box and the cut box are fixed on the outer frame, respectively; the horizontal loading system, the vertical loading system and the measuring system are connected with the cut box, respectively. The invention has high measuring accuracy and good stability; all the data are automatically collected, thus reducing artificial reading error; it adopts variable frequency electric motor so as to reduce the manufacturing cost on the premise of assuring a stable cutting speed; all the parts are removable, convenient to transport and install. It can be used in determining peak values and remaining shearing strength of fine earth, coarse earth and soft rock and provide strength parameter for engineering design and rock and earth stability.

The invention belongs to the technical field of rocks and soil mechanics and geotechnical engineering and discloses a rock true triaxial test device which comprises a vertical loading system, a horizontal loading system, a counterforce frame, a triaxial chamber and a floating frame, wherein the vertical loading system is arranged on the upper part of the counterforce frame; the triaxial chamber is fixed on the counterforce frame; the floating frame is movably connected with the triaxial chamber through a sliding connector and is capable of sliding relative to the triaxial chamber along the horizontal direction; the floating frame comprises a first fixing plate, a second fixing plate and a guiding rod connected between the first and second fixing plates; the guiding rod is movably connected with the triaxial chamber through a sliding pipe sleeve arranged on the triaxial chamber; the horizontal loading system comprises a first force applying component and a second force applying component opposite to the first force applying component; the first force applying component is fixed on the first fixing plate; the second force applying component is fixed on the second fixing plate. The invention provides the rock true triaxial test device with high aligning stability.

The invention discloses a simulated test unit and method for slope stability with faulting, relating to the technique of rock-soil mechanical test. The test unit is characterized in that: a soil sample in a fault soil model instrument is divided into hanging wall and footwall by the fault surface; a first continuously variable transmission (CVT), a first power transmission system, and a supporting leverage are connected with the hanging wall successively and provide power for displacement to the hanging wall; a second CVT and a second power transmission system are connected with the footwall successively and provide power for displacement to the footwall; a displacement mark, a soil pressure box and a dial indicator are put in the soil sample, and the relative data are recorded. Accordingto the invention, the movement processes of transformation and damage of slope containing fault soil are represented accurately, so that the invention provides a new approach for studying formation mechanism of landslip and other geological disasters under complex geological environmental conditions.

The invention relates to a computational simulation method of a flow slide catastrophe of a rock and soil material, belonging to the technical fields of computational rock and soil mechanics, geologic hazard prevention and control and geologic environment protection. Aiming at the limitation that the conventional grid-based computing method is only suitable for small-deformation analysis, the invention discloses a computational simulation method of an entire flow slide catastrophe process of the rock and soil material based on smoothed particle hydrodynamics (SPH). According to the method, a Navier-strokes equation is used as a control equation, solid phase and liquid phase of the rock and soil material are described by using a sub-load face Cambridge model and an incompressible fluid constitutive model respectively, porous medium theory and darcy law are introduced to calculate solid-liquid coupling acting force, and a computation model, which considers the full coupling of water and soil, of the flow slide catastrophe of the rock and soil material, is established. According to the computational simulation method, the entire process of large-deformation flow damage of the rock and soil material can be effectively represented, and the fluidization characteristic of the rock and soil material is captured, so that powerful scientific basis is provided for engineering design, engineering construction, disaster prevention and reduction and the like of high-risk areas of the flow slide disaster, and meanwhile, application of the computational rock and soil mechanics in the technical fields of actual engineering construction, geologic hazard prevention and control and the like is forcefully promoted.

The invention belongs to the technical field of rock and soil mechanics, and relates to a true triaxial test device for combustible ice sediments. According to the true triaxial test device, the formation process of the combustible ice sediments in a deep sea reservoir stratum can be simulated in a laboratory, a true triaxial compression test is carried out on the combustible ice sediments, and therefore a technical guarantee and support are provided for accurately predicting the strength characteristics of the reservoir stratum and researching the constitutive relation of the reservoir stratum; and in the true triaxial compression test, main stress in three directions can be applied independently, the real stress characteristics of the combustible ice sediments in a bottom layer can be better reflected, but the boundary loading condition problem can be easily caused in the loading process, composite loading plates of rigid plates and deformation plates are adopted in the front-and-back pressurization direction, so that the pressure can be uniformly loaded on a sample through the composite loading plates in the front-back pressurization process, and therefore the problems that mutual interference of loading plates in three-directional loading is caused in the loading process, and loading is not uniform due to the fact that the sample is deformed in the loading expansion processcan be solved.

The invention provides a triaxial permeability testing device, belonging to the field of testing technique of soil mechanic property, in particular relates to a triaxial permeability testing device which is used for measuring the permeability characteristic of the soil under different stress and strain conditions; the technical proposal is that the shape of a base and a top cap is reconstructed on the basis of a triaxial shear instrument; water inlet holes and water inlet pipelines are added on the base during the permeability process in three directions; water outlet holes and water outlet pipelines are added on the top cap during the permeability process in three directions; the specimen generates shear deformation by surrounding pressure and an axial pressure system; the permeability of the specimen under different shear deformation conditions in any one direction out of the three directions is achieved by changing the connecting and closing type of the water inlet pipeline and the water outlet pipeline and applying the permeability pressure on the specimen by the water pressure system. The shaped of the improved base and top cap is beneficial for arranging water inlet pipelines and water outlet pipelines and facilitates achieving the permeability test in any one direction out of the three directions; and the shifting operation of the connecting type of the water flow pipelines of different permeability directions is simple and the control is convenient.

The invention discloses a swelling soil humidifying and swelling numerical simulation method under the rainfall infiltration condition. The swelling soil humidifying and swelling numerical simulation method comprises the following steps: adopting a fluid-solid coupling module and compiling a relevant FISH language program, and realizing the relation of change of the non-saturated region matrix suction, the non-saturated permeability coefficient and the soil strength parameter along with the moisture content in the unsaturated seepage process; then based on the 'humidity stress field theory', according to the similarity of a seepage continuity differential equation and a heat conduction equation, deducing the equivalent conversion relation of a thermodynamic parameter and a seepage parameter, and adopting a thermodynamic module to realize swelling soil swelling deformation process under the humidifying condition. According to the swelling soil humidifying and swelling numerical simulation method, the swelling soil humidifying and swelling whole-process numerical calculation under the rainfall infiltration condition can be effectively and comprehensively realized, so that effective scientific guidance means are provided for engineering design and construction in the high-risk area of the swelling soil engineering disaster, and meanwhile application of the computational soil mechanics to the technical fields of practical engineering construction, geological disaster prevention and control, and the like, is powerfully driven.

The invention discloses a test device for rapidly testing soil strength and permeability coefficient by simulating a freeze-thaw cycle, and relates to the technical field of soil mechanics and geotechnical engineering. The test device comprises a box body and a sample box, wherein the sample box is arranged inside the box body; and the test device further comprises a measurement system used for measuring various physical and mechanical parameters of soil, a freeze-thaw cycle system used for providing temperature control for a freeze-thaw process of a soil sample, and a displacement control system used for horizontal and vertical precise movement of each sensor. The test device has the benefits that a micro-static probe can measure the penetration resistance of a soil taper tip, and a crossshear plate can measure the undrained shear strength and shear modulus of the soil sample; and by analyzing the relationship between the undrained shear strength and the shear modulus of a specific soft soil sample through tests, the most simple and feasible solution for calculating the shear strength of the on-site soil by a static penetration test can be provided.

The invention provides a portable rock-soil mechanics real-time loading test device matched with an industrial CT (Computed Tomography) machine, and belongs to the technical field of rock-soil mechanics tests. The portable rock-soil mechanics real-time loading test device comprises an axial pressure system, a confining pressure system and a physical quantity measuring system, wherein the axial pressure system comprises rigid stand columns, an upper cross beam, a lower cross beam, connecting nuts, a piston, a rigid dowel bar and a data lead; the confining pressure system comprises a pressure chamber, a pressurizing production pipe, a sample drain pipe, a pressurizing exhaust pipe, a water-permeable stone, an oil filler pipe, a supercharger, an oil tank, a water storage tank, an oil pipe valve, a pressurizing port valve, a water storage tank valve and an exhaust port valve; and the physical quantity measuring system comprises a pressure sensor, a load controller, a displacement sensor and a data lead. The three systems are arranged on a CT rotary table, and X rays are emitted from a radiation source, penetrate through the barrel wall of the pressure chamber and the sample, are received by a detector, and are transmitted to a computer for reconstruction of a fine sample image. By adopting the device, the problem concerned with visual and digital representation of the internal structural morphology of a rock-soil body sample in a loading deformation process is solved.

The invention discloses a landing impact test device, and a method for conducting the landing impact test by utilizing the device. The device comprises a test frame, a suspension unit, a percussion control unit, a fixed pulley, a steel cable, a motor, a landing bed and a test cabin. According to the technical scheme of the invention, based on the energy conservation law, the terrain clearance and the tilt angle of the test cabin are regulated, so that the potential energy is converted into the kinetic energy after the application of the test cabin. The preset vertically falling velocity and the preset horizontal velocity of the test cabin are realized. Meanwhile, the posture of the test cabin is set by a regulation tool, and a corresponding landing impact simulated medium can be laid on the landing bed according to the test requirements of different landing grounds. In this way, the soil mechanics characteristics of the simulated medium are enabled to accord with the soil properties of real landing grounds. The authenticity and the reliability of test parameters for the landing impact test on the test cabin are improved. The test method is simple and easy to operate. Meanwhile, the device and the method are strong in bearing capacity, wide in horizontal speed control range, controllable in posture and high in safety coefficient.

The invention relates to the field of experimental equipment for testing soil mechanical properties in geotechnical engineering discipline, in particular to a spinning type coarse-grained soil triaxial experiment sample preparation device and sample preparation method. The spinning type coarse-grained soil triaxial experiment sample preparation device comprises a base, a counter-force frame, a rubber membrane, a sample preparation cylinder, a spinning device, a water permeable plate and a sample cap, wherein the base comprises an upper layer of cylindrical bosses, a middle layer of cylindricalbosses and a lower layer of cylindrical bosses with different diameters, and the counter-force frame comprises an annular bottom plate, a rigid counter-force column and a counter-force cover plate. The sample preparation method by utilizing the sample preparation device comprises the following steps: binding the rubber membrane on the base; arranging the annular bottom plate on the periphery of the upper layer of cylindrical bosses in a sleeving mode; installing the sample preparation cylinder; preparing the soil materials; filling the soil materials layer by layer and compacting; taking outa soil sample. According to the method, on the premise that the coarse-grained soil structure is not damaged, the coarse-grained soil sample used for the triaxial compression test can be prepared in ashort time, and the device is simple in structure, convenient to use, capable of accurately controlling layering and the total density of the coarse-grained soil, uniform in sample preparation, economical and practical.

The invention relates to the field of geotechnical engineering, in particular to an evaluation processing method for entrainment superimposed settlement of pile groups. According to the method, by utilizing a solid deep foundation simplified calculation model, a calculation formula for stress fields of surrounding soil bodies of pile foundations is deduced, and from the analysis of the calculation of the settlement of the pile foundations to the calculation of the stress fields and displacement fields of the surrounding soil bodies of the pile foundations, the evaluation processing method for the entrainment settlement of the pile groups is formed, and meanwhile, the entrainment settlement calculation of a single pile group foundation can be expanded to the entrainment settlement calculation of multiple pile group foundations by using the method. The evaluation processing method for the entrainment superimposed settlement of the pile groups provided by the invention has the advantages that the stress fields of the surrounding soil bodies of equivalent pier foundations are completely deduced; a method of classical soil mechanics is introduced into the evaluation method for the entrainment settlement of the pile groups, and therefore, not only can the settlement of pile tips be evaluated, but also the entrainment superimposed influences of the pile group foundations on the surrounding soil bodies can be evaluated. The evaluation processing method for the entrainment superimposed settlement of the pile groups is clear in concept, simple in method and reliable in evaluation accuracy, and convenient for engineering application.

The invention discloses a demonstration and display teaching device for a soil engineering centrifugal simulation technology test. A centrifuge testing demonstration part is arranged on the right side of a whole display table. A computer, a display screen, a direct current power supply, a control panel, an operation room model, an electric control cabinet model and an operation table model are arranged on the left side of the display table. The demonstration and display teaching device can be used to demonstrate rock-soil body deformation and damage processes to non-professional people or students, enables the non-professional people or the students to understand basic characteristics of soil, can be combined with soil mechanics and foundation engineering courses to conduct test teaching, achieves efficient studying effect through active participation of the students, and can be directly used for research result introduction, class teaching, and the like when connected with an external display device through a computer. The demonstration and display teaching device is complete in function, simple, visual, convenient to operate, and capable of meeting requirements of rock-soil type test demonstration and displaying teaching.