689 results about "Triaxial shear test" patented technology

The invention discloses a true triaxial loading and unloading test device for large-size bedded pressure-bearing rock and a testing method. The device comprises a confining pressure loading module, a sample storage and water outlet module, a confined water loading module, a load loading module and a signal collecting and processing system, wherein the confining pressure loading module comprises two horizontal loading and unloading systems which are independent and perpendicular to each other and is used for performing horizontal load loading and unloading on the wrapped sample storage and water outlet module; the confined water loading module is located at the bottom of the sample storage and water outlet module and is used for performing confined water loading and unloading on the bottom of the bedded rock; the load loading module is located at the top of the sample storage and water outlet module and is used for performing vertical load loading and unloading on the top of the bedded rock; the signal collecting and processing system is used for collecting and analyzing signals in a test process. The test device realizes the true triaxial test of the bedded rock through four independent loading and unloading systems, truly simulates three-way anisobaric stress state of the coal-series bedded pressure-bearing rock and is more true and more reliable than a conventional triaxial test.

Shale reactivity is evaluated by testing a preserved test plug of shale sample in a triaxial test machine, the test plug being prepared by collecting a downhole shale sample and keeping it all times immersed in a preserving mineral oil so as to avoid dehydration, then applying radial and axial pressure on the test plug surrounded by mineral oil up to equilibration to overburden pressure, the test fluid being then contacted with the sample and the interaction of fluid and sample being evaluated by axial and radial deformations as measured by a triaxial detector apparatus sensitive to vertical and radial strains occurring across the shale sample, while the shale sample is subjected to any of a set of different conditions including a temperature or thermal potential, a hydraulic potential and/or a chemical potential. Only one fluid is tested on each sample. A sister test at ambient temperature and atmospheric pressure is run in order to constitute a visual counterpart of what is occurring in the triaxial test machine.

The present invention relates to a pressure bearing permeation grouting strengthening test apparatus and a method. The apparatus mainly comprises a grouting bucket, a slurry storage device and a manual grouting pressurization device, wherein the grouting bucket comprises a base, a bucket body and a pressing head, a grouting hole is arranged in the base, and is connected with the slurry storage device through a high pressure soft pipe, the slurry storage device is provided with a piston, and the manual grouting pressurization device is placed below the piston. With the test apparatus, influence of axial pressure, confining pressure and other factors of the upper portion of the micro fracture (pores) geology on the grouting can be simulated; the grouting conditions of the geological bodies with different physical and mechanical properties under different grouting parameters and different grouting process conditions can be simulated so as to analyze a mechanism and an effect of grouting strengthening; and with the test apparatus, broken coal rock bodies, soil samples and sand samples can be made into complete samples, can be processed into standard samples through a cutting machine, and then are subjected to related uniaxial and triaxial tests. In addition, the test apparatus has characteristics of simple structure, easy manufacturing, low cost, easy operation, and reliable use.

The invention provides a penetration and corrosion triaxial testing apparatus for gravel soil. The penetration and corrosion triaxial testing apparatus comprises a pressure control system, a penetration and corrosion triaxial testing system and a sand-water separation system, wherein the penetration and corrosion triaxial testing system is used for containing gravel soil samples and can form a penetration and corrosion environment with a multistage water head and complex stress condition through self-loaded axial pressure as well as confining pressure and water pressure, provided by a pressure supplying system; the contained gravel soil samples can flow out of the penetration and corrosion triaxial testing system in the penetration and corrosion environment and then enter the sand-water separation system. The invention also provides a testing method of the triaxial testing apparatus. According to the triaxial testing apparatus, the samples are placed in a pressure chamber with confining pressure to be saturated, so that the multistage water head can realize penetration, corrosion and strength testing under a condition that the real environment stress state is simulated; corroded particles are discharged through a porous chassis of the pressure chamber, the mass of the corroded particle can be weighed in real time after sand-soil separation, and the penetration and corrosion triaxial testing process with the multistage water head and the complex stress condition can be effectively carried out.

The invention discloses a triaxial test apparatus of soil under water-soil chemical action and a method thereof, and relates to a testing technique of soil under a special environment. The device comprises a device frame (10), a triaxial pressure chamber (20), a confining pressure exerting and deformation test device (30), a solution cyclic displacement device (40), a stress/strain control loading device (50), a displacement sensor (60) and a data collecting and processing device (70). The uniformity of ingredients and concentration of internal pore water solution of a specimen is ensured by solution circulation; the change rules of soil deformation and strength caused by chemical solution transfusion under constant stress can be simulated and researched; the confining pressure exerting principle is improved; accurate measurement of body deformation is achieved; and the conversion of strain control and stress control can be achieved.

The invention discloses a high-pressure servo dynamic true triaxial testing machine. A main machine consists of three sets of loading/unloading systems which are independent from one another, including two sets of vertical loading/unloading systems and a set of horizontal loading/unloading system which are all high-rigidity loading/unloading frames. The testing machine is a comprehensive type rigidity testing machine which can perform multiple tests such as simple single-shaft tension, compression and shearing tests, ordinary triaxial tests and true triaxial tests, moreover the testing machine can provide pressure which is large enough to meet experiment requirements of materials such as most rock, static load and disturbance load can be independently exerted to a rock sample test piece in three directions which are perpendicular to one another in a three-dimensional space, and the load can be rapidly unloaded in a single side. In addition, all operation is accomplished by a computer keyboard and a mouse, and meanwhile a necessary manual control device is provided, so that the testing machine has the characteristics of convenience and flexibility in operation.

The invention relates to a rock shearing seepage coupling true triaxial test system, which comprises a loading assembly, a test box, a seepage assembly, a detection assembly and a control assembly. The whole system is high in rigid, safe and reliable in high-pressure water injection and sealability, good in sealing reliability, high in loading stability and protection strength and capable of effectively reducing the end-part friction effect and the corner effect and realizing the uniform triaxial stress state as far as possible; a loading test device and a mainshaft loading mechanism are designed in a split manner, and safe high-pressure water injection is achieved; a safety valve and a pressure-stabilizing control device are arranged on a water outlet; and the rock shearing seepage coupling true triaxial test system is stable to control.

The invention discloses a true triaxial apparatus without pressure cell structure, of which deformation is free from side interference, and the true triaxial apparatus is applicable to the true triaxial test of soil samples comprising coarse-grained soil and fine-grained soil. A rigid plate is used to pressurize in vertical direction, the bottom surface of the rigid plate and the top surface of the base are respectively provided with a roller for preventing side interference; rigid and flexible mixed blocks which are composed of metal plates and hollow rubber pipes in an alternating manner are used to pressurize in the front-rear direction, the true triaxial apparatus can be compressed along with the sample driven by the rollers in the vertical direction but in the horizontal direction; and a flexible water pocket structure is used to pressurize in left-right direction. The deformations of the sample in three directions can be obtained by the conversion calculation of the rotation circle-number of the motor in the corresponding direction, thus the accuracy is higher. The true triaxial apparatus can be used for the test of stress path in three-dimensional stress space, and the side interference can be efficiently avoided when the deformation of the sample is relatively obvious.

The invention discloses large-scale true triaxial experiment testing equipment. A first axial piston is arranged on a pressure chamber base and connected with the pressure chamber base in a sealing mode by a sealing copper sleeve; the lower part of the first axial piston is connected with a balance disk; the upper part of the first axial piston is welded with a sample base; a sample is arranged on the sample base; a compressed force transferring plate and a lateral force transferring plate which can be deformed along with the sample are sequentially arranged on the two sides of the sample; the outside of the sample is sequentially connected with lateral pistons, sigma 2 load sensors and sigma 2 pressurizing oil cylinders; the sigma 2 pressurizing oil cylinders are fixed on lateral reaction force beams; four pull rods pass through a pressure chamber and are connected and fixed with the lateral reaction force beams at the two ends of each pull rod; and a second axial piston is arranged on the top of the pressure chamber and connected with the pressure chamber in a sealing mode by a sealing copper sleeve. The invention also provides a large-scale true triaxial experiment testing method. Pressure can be applied respectively to the sigma 1 direction, the sigma 2 direction and the sigma 3 direction of the sample by the invention, and the test technical requirements of the true triaxial experiment are met.

The invention discloses a multifunctional true triaxial rock drilling test system and a test method for characterizing the characteristics of rocks. According to the method, a test piece is drilled for several times to obtain different rock cores, then the rock cores are subjected to single axial tests and triaxial tests so as to obtain a plurality of sets of mechanical property parameters; then a true triaxial rock drilling tester that can directly measure the parameters while drilling is used to obtain a plurality of sets of parameters while drilling; a mathematical relationship between the mechanical property parameters and the parameters while drilling can be established, and thus the mechanical property parameters can be obtained only through measuring the parameters while drilling of rocks according to the mathematical relationship. According to the method, a multifunctional true triaxial rock drilling tester is taken as the preset test apparatus; the tester can perform true triaxial loading on a test piece and is capable of simulating the drilling process when a test piece is pressed from three directions in underground engineering; the relationship between the parameters while drilling and mechanical characteristics of rocks under different pressures on a test piece can be established, and the test method comprises specific steps from sample preparation to data processing.

The invention relates to a low-frequency disturbance and high-speed impact type high-pressure true triaxial test device and a low-frequency disturbance and high-speed impact type high-pressure true triaxial test method. The device comprises a dead load loading framework, a dynamic load loading framework, four dead load loading actuators, two dynamic load loading actuators and a split Hopkinson press bar mechanism, wherein all the actuators are connected with an oil source system; hollow ducts are formed in axial centers of piston shafts of the dynamic load loading actuators, dynamic pressure sensors in a hollow annular structure are mounted at the end parts of the piston shafts, and the split Hopkinson press bar mechanism respectively applies high-speed impact loads to a rock sample by virtue of the hollow ducts and the dynamic pressure sensors; the two dynamic load loading actuators adopts a static pressure oil path balancing-supporting sealing manner and are connected with the oil source system through servo valves, energy accumulators are assembled to oil paths, the flow is increased by virtue of the servo valves to drive dynamic response of pistons, and the system pressure during low-frequency disturbance loading is balanced by virtue of the energy accumulators. According to the device and the method, low-frequency disturbance loads and high-speed impact loads are freely applied to the same equipment for the first time.

The invention relates to the field of numerical simulation technology and discloses a rock material true triaxial test numerical simulation method considering an intermediate principal stress effect to truly reflect strength characteristics and failure modes of rock materials under a true triaxial stress condition. The method comprises the steps that a finite difference increment iterative computing format based on Mogi-Coulomb failure criteria is subjected to secondary development in FLAC3D numerical simulation software, and a Mogi-Coulomb constitutive model is obtained; and a numerical model of the rock materials under the true triaxial stress condition is established, basic physical mechanical parameters are assigned to the numerical model, and the Mogi-Coulomb constitutive model is loaded and called to perform simulation operation to obtain a corresponding numerical simulation computing result. According to the method, influences of intermediate principal stress on rock strength and the failure modes are fully considered during numerical analysis of the failure characteristics of the rock materials under the true triaxial stress condition, so that the simulation result is truer and more reliable.

The present invention discloses a true triaxial test ultrasonic wave and acoustic emission testing system. According to the present invention, a true triaxial test apparatus has six sides of pressurization units, wherein ultrasonic wave and acoustic emission coupling test transducers are arranged between every side of the pressurization unit and corresponding surfaces of rock, a communication terminal of at least one ultrasonic wave and acoustic emission coupling test transducer is connected with a signal output terminal of a multi-channel ultrasonic wave defect detector, communication terminals of other ultrasonic wave and acoustic emission coupling test transducers are respectively connected with a signal input terminal of the multi-channel ultrasonic wave defect detector and a signal receiving terminal of an acoustic emission instrument through signal shunts, and the acoustic emission instrument and the multi-channel ultrasonic wave defect detector are connected with a computer. With the present invention, an ultrasonic wave test and an acoustic emission test can be performed on the same rock, completely comprehensive data information can be provided for understanding of deformation and breaking law, and mechanics mechanism of the rock, and adverse affects on test results by difference of different blocks can be avoided.

The invention discloses a true triaxial test method for simulating shearing type rock burst. In the method, a true triaxial loading path and boundary condition characterized in that a single surface is free and five surfaces are stressed is adopted, a test piece with a large size is adopted, a certain three-dimensional load is applied, a loading rate of one direction is controlled, and a cuboid rock sample of which the single side is free under a three-dimensional compression stress state is used for simulating a special mechanical behavior of a field surrounding rock representativeness rock unit in a tangential stress centralization process. When the method is adopted, an inoculation and generation overall process of the shearing type rock burst can reappear in a laboratory, the problem that a traditional indoor test method cannot reasonably simulate the shearing type rock burst under a complex stress condition is solved, and the true triaxial test method has important practical significance and academic value for the mechanism and prediction studies of the type of rock burst.

The invention discloses a large-scale true tri-axial test method and a large-scale true tri-axial test device, which can be used for carrying out the true tri-axial test on an original grading rockfill body. The device is arranged in a concrete cave chamber; six faces of a sample are loaded by rigid slabs; three directional main stress is applied by a hydraulic jack controlled by adopting a hydraulic system; two layers of rubber membranes are sleeved at the inner side of a steel plate so as to reduce friction; silicone grease is coated between the rubber membranes; and rigidity compression plates are respectively provided with a displacement sensor or a dialgage used for determining the deformation of the sample in all directions. The device can be used for testing a large-sized original grading sample of the rockfill body, therefore, the size effect can be completely avoided, larger axial strain can be achieved, and a complicated stress-strain path can be simulated.

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 device for measuring the permeability of rock in a fracturing process. The device comprises a triaxial test chamber (1), a core gripping device, a carbon dioxide cylinder (2), a flow monitoring device, a hydraulic oil confining pressure loading system (3) and a computer (4), wherein the hydraulic oil confining pressure loading system (3) comprises an oil pump, a booster pump and an oil tank; the core gripping device comprises a core gripper (11), an air cushion (12), an insulating self-adhesive sealing tape (13) and a thermal shrinkable sleeve (14); an air inlet (15) connected with an air inlet valve (9) and an air outlet (16) connected with an air outlet valve (10) are formed in the upper end and the lower end of the core gripper (11) respectively; the carbon dioxide cylinder (2) is connected with the air inlet valve (9); and the flow monitoring device comprises a glass burette (17) and a rubber hose (18). The invention further discloses a measuring method. The device provided by the invention has the beneficial effects of convenience and easiness in refitting, safety and simplicity in operation, small measuring error, high working efficiency and high utilization ratio of carbon dioxide.

The invention relates to an organic rock mass containing high-temperature and high-pressure triaxial test device and method. The device comprises a high temperature pressure chamber, an upper pressure guide head, a lower pressure guide head and a lateral pressure solid, wherein the middle part of the lower pressure guide head is provided with a center hole; a high temperature block-proof net is arranged between the lower pressure guide head and an organic rock mass test sample; the external part of the lower pressure guide head is provided with a collection bottle arranged in a condensed water tank and a gas collection bottle; the collection bottle is provided with a gas outlet pipe; and the gas outlet pipe is provided with a gas inlet value. The method comprises the following steps of: heating the organic rock mass test sample under a buried depth of 400-600m of a preset pressure, heating from the room temperature, and performing heat preservation for two hours with every increase of50 DEG C until the organic rock mass test sample starts to resolve; pyrolyzing generated pyrolysis water, tar oil and liquid-state shale oil after being subjected to cooling and then retaining in thecollection bottle, wherein pyrolysis gases enter into the gas collection bottle filled with water through the gas outlet pipe; and recording a temperature and a pressure when the gases in the collection bottle are generated. According to the invention, a reliable research means is provided for the pyrolysis research on the big-block organic rock mass test sample.

The invention discloses a triaxial test three-dimensional deformation reconstruction and measurement method and belongs to the technical field of geotechnical experiment testing. The method is characterized in that a transparent square pressure chamber is adopted, a specially-produced rubber membrane whose label can be tracked is marked, two digital cameras at the front and at the back and a corresponding image acquisition control and processing system are employed, through tracking the position change of the angle points of the rubber membrane on an image, a certain hypothesis is adopted to obtain the space coordinate of the characteristic points of the rubber membrane on the surface of a sample, and the images acquired by the two cameras at the front and at the back are spliced so that the measurement of the three-dimensional deformation of the sample during a triaxial test process is realized. Through combination with ANSYS finite element software, a three-dimensional deformation grid and a three-dimensional whole surface strain field of the sample are obtained. The method provided by the invention has the following advantages: the comprehensive deformation characteristics of the sample in the triaxial test process can be obtained from a front direction and a back direction, and the space positions of surface characteristic points in a triaxial test can be obtained for realizing reconstruction of three-dimensional deformation of the sample, and the distribution of the three-dimensional surface strain field of the sample can be obtained.

A multifunctional true triaxial rock drilling test system and method; rock cores are respectively taken from a plurality of drilling holes on the same test piece, uniaxial test and triaxial test are respectively performed on these rock cores to obtain multiple groups of mechanical property parameters, multiple groups of drilling parameters are obtained according to a multifunctional true triaxial rock drilling tester that can directly measure the drilling parameters, relational expression between mechanical property parameters of rock mass and the drilling parameters is established, and mechanical property parameters of rock mass can be obtained just by detecting the drilling parameters of the rock mass through the relational expression. The multifunctional true triaxial rock drilling tester is preset test device, has function of performing triaxial loading on the test piece, and can simulate drilling process of drilling rig in a three-way confining pressure state in underground engineering of the test piece.

The invention discloses a remoulded soil stratified compaction sample preparer for an indoor triaxial test and a method thereof and relates to a sample preparation technology of the indoor triaxial test. The sample preparer comprises a base, a compaction barrel and a limiting compaction cover; the base, the compaction barrel and the limiting compaction cover are successively connected from bottom to top; the base is a short cylinder; the compaction barrel comprises an outer sleeve, a soil sample forming barrel and a hooping bolt; the limiting compaction cover comprises a top cover and a limiting column connected up and down. According to the sample preparer disclosed by the invention, the thicknesses of the layers of the test sample can be guaranteed uniform, and the relative density is uniform; the sample preparer can be repeatedly used, and test samples of other specifications can be manufactured by changing the structure and dimension of a part; the sample preparer is simple in structure, convenient to disassemble, simple to operate, relatively low in cost, long in service life, accurate to prepare sample, efficient and reliable and small in interference by artificial factors; the sample preparation method is easy to master, high in universality, time- and labor-saving and convenient and rapid.

A high-pressure true triaxial test apparatus with capacity of low-frequency disturbance and high-speed impact includes static and dynamic loading frames, four static loading actuators, two dynamic loading actuators and an SHPB mechanism, wherein all actuators are connected with a hydraulic station system; a hollow way is formed in the axial center of each piston shaft of the dynamic loading actuators, a dynamic pressure sensor adopting a hollow ring structure is mounted at the end part of each piston shaft, and the SHPB mechanism applies a high-speed impact load on a rock sample through the dynamic pressure sensors respectively; and the dynamic loading actuators adopt a static pressure oilway balance support sealing manner and are connected with the hydraulic station system, each oilway is provided with an energy accumulator, and flow is increased by the servo valves to drive pistons to perform dynamic response.

A true triaxial experiment system for rock materials comprises a loading frame and a triaxial clamp box, wherein an X-direction cart type loading device, a Y-direction separation type loading device and a Z-direction single-head type loading device, each loading device is equipped with a static loading cylinder and a disturbance loading cylinder, and bearing tables and static loading cylinders are arranged at an interval front and back, left and right and up and down respectively; the triaxial clamp box comprises a box body and a lower Z-direction loading rod, an upper Z-direction loading rod, two X-direction loading rods and two Y-direction loading rods, which are used for being contacted with six end surfaces of a cubic rock sample for loading respectively, and a sound emission sensor and a deformation sensor are mounted on each of the lower Z-direction loading rod, the upper Z-direction loading rod, the two X-direction loading rods and the two Y-direction loading rods. The true triaxial experiment system for the rock materials can realize independent static and different-source disturbance loading and unloading and has the advantages that a sample is convenient to mount, loading and bearing parameters are synchronized precisely, characterization parameters in a sample mutagenesis process are diversified and the like.