259 results about "Three dimensional stress" patented technology

The invention provides a full-sew-length three-dimensional crushing data simulation method and device for oil and gas reservoir development. The method comprises obtaining pre-stack seismic data of an oil and gas reservoir development object region, obtaining the pre-stack seismic data to conduct elastic parameter inversion and obtaining an elastic parameter data body of the oil and gas reservoir development object region, constructing a rock mechanic parametric model based on three-dimensional grid nodes according to the elastic parameter data body, calculating stress information on the three-dimensional grid nodes, generating three-dimensional stress field distribution model; and conducting full-sew-length three-dimensional numerical simulation in a crushing process according to the rock mechanic parametric model and the three-dimensional stress field distribution model. The full-sew-length three-dimensional crushing data simulation method and device can improve accuracy and efficiency of crushing data.

The invention relates to a tunnel three-dimensional stress field simulator, which comprises a test box, lifting jacks and a hydraulic loading and control device, wherein the test box is arranged in a frame-shaped loading beam; a front loading plate is arranged in front of the test box; a rear loading plate is arranged on a rear wall of the test box; the peripheries of the front loading plate and the rear loading plate are connected through pull rods; the lifting jacks are respectively and fixedly arranged on an inner side of the loading beam and an inner surface of the front loading plate; two longitudinal support steel rails are arranged on a bottom part of the loading beam; and pulleys on bottom parts of the front loading plate and the rear loading plate are matched with the support steel rails. The device preferably simulates a three-dimensional surrounding rock stress field of a stratum where a shield tunnel and a mining method tunnel are located, and realizes construction simulation of excavation, support and the like of tunnel engineering under the condition of the three-dimensional stress field, so that the disturbance influence of construction on the surrounding rocks is researched, the stress performance of a tunnel structure under the condition of a complex stress field is analyzed, a more reliable test basis is provided for the design and the construction of the tunnel, and further the safety and the economy of the tunnel are ensured better.

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 relates to a triaxial core holder. A pressure cap, a left plug, a core chamber, a left core plug, a positioning washer and a left small pressure cap are arranged at the left part of the core holder, and an axial pressure piston, a right small pressure cap, a right plug and a right core plug are arranged at the right part thereof. The triaxial core holder is characterized in that a gum cover is arranged on the periphery of the ore chamber and connected with two pairs of pistons through connecting plates; and two pressure-bearing cylinders are connected on the outer sides of the pistons. By adopting three groups of pistons (horizontal, vertical and axial), the triaxial core holder can simulate the holder with two pressures at most than before. The invention can better simulate the three-dimensional stressed situation of the core in a stratum, and the three groups of pressures can be freely adjusted, therefore, the stressed situation of the stratum can be truly simulated, so that the experimental data is closer to actual data inside the stratum. The invention can provide a better manner for petroleum exploration.

The invention relates to a novel three dimensional stress measuring sensor, which comprises a machine body and hardware circuits, wherein the machine body is composed of a metal hollow elastic body and resistance strain gages, and is buried in bituminous concrete, the resistance strain gages are in three groups, the three groups are used for measuring the component of the applied stress in X, Y, and Z directions respectively, each group has four resistance strain gages, and when stress is applied on the metal hollow elastic body, two resistance strain gages are pulled and two are pressed in each group, and strain symbols are opposite; the hardware circuits comprise differential type Wheatstone full bridge circuits, zero setting circuits, an amplifying circuit, an acquisition module, a digital filtering module, a communicating module, and a power supply circuit; the three groups of the strain gages make up the three differential type Wheatstone full bridge circuits respectively, and each differential type Wheatstone full bridge circuit is in external connection with a zero setting circuit; outputs of the three groups of the each differential type wheatstone full bridge circuits are communicated with a PC machine through the amplifying circuit, the acquisition module, the digital filtering module, the communication module.

The invention relates to a measurement method for stress change of rocks during TBM tunneling. The technical problems to be solved in the invention are as follows: providing the measurement method for stress change of rocks during TBM tunneling, measuring the three-dimensional stress change of some point in rock of a TBM evacuation hole section, judging the damaged range of the rock, and optimizing supporting design to ensure the overall stability of a grotto and the safety of stuff. The technical scheme for solving the problem is as follows: the measurement method for stress change of rocks during TBM tunneling comprises the following steps: a, determining the embedding position and the quantity of measure points of a hollow inclusion stressometer; b, digging an auxiliary hole or using an existing grotto to drill a TBM hole section to be evacuated and embedding the hollow inclusion stressometer; c, performing TBM tunneling, monitoring and recording the stress change of the hollow inclusion stressometer; d, determining the elastic modulus and Poisson ratio of rock of a section to be measured; and e, working out an equation, i.e. E epsilon k=Ak1sigmax+ Ak2sigmay + Ak3sigmaz + Ak4tauxy + Ak5tauyz + Ak6tauzx, solving the six components, namely sigmax, sigmay, sigmaz, tauxy, tauyz and tauxz of ground stress. The measurement method is mainly used for the supporting optimization design of construction time of tunnels and the like and the estimation of overall stability of grottos.

The invention relates to a test method for determining the unsaturated soil water characteristic parameters, which utilizes a test device to measure the soil water retention curve of soil body. The device mainly comprises a vertical displacement measuring meter 1, bolts 2, a pressurized shaft 3, a pressure chamber 12, a sample top cap 13, a fixed bolt 24 and a sample base 25. A second air pressure control valve 22 and a second water pressure control valve 19 are adjusted, and the sizes of the pore air pressure and pore water pressure in a sample are changed by a second air pressure sensor 23 and a second water pressure sensor 38, i.e. the size of matric suction s of the sample is changed; after the liquid level in a second volume water measuring tube 17 is stabilized, the change value of water quantity of inlet and outlet samples is read out to obtain a new water content of the sample w1 corresponding to matric suction s 1 so as to obtain a group of test data s1 and w1 on the soil water retention curve. The determination method has convenient use, high measuring precision, meets the requirements of three-dimensional stress, can measure the humidifying section and the dehumidifying section of the soil water characteristic curve, and is suitable for measuring the soil water retention curves of various soils in civil engineering.

The invention discloses a multifunctional true triaxial rock creepmeter, comprising a base, a test piece mounting base arranged on the base, two groups of horizontal direction stress loading systems with the same structure, a vertical direction stress loading system and a creep data measuring system. The multifunctional true triaxial rock creepmeter disclosed by the invention can carry out a single-axis pulling and pressing creep test and also can carry out a true triaxial compression, pulling and pressing combined creep and unloading-creep test which simulates three-dimensional stress state and loading and unloading stress path of a natural geological rock mass and an engineering rock mass and maintain tension stress states in one or two directions unloaded to the rock; and test function is more comprehensive, practicability is stronger, and a pulling and pressing combined creep and stable pressing and pulling stress conversion unloading-creep test is realized; a pull pressure loading system can provide a pressure which is high enough to meet creep test requirements of most rock materials, and a long-term constant load can be provided; and the multifunctional true triaxial rock creepmeter disclosed by the invention has the characteristics of having a simpler structure, hardly consuming energy source in a test process and having low test cost.

The invention discloses a gob-side entry retaining method for an anchor bolt network gangue bag wall body for coal mining without pillars. The gob-side entry retaining method comprises the following steps of: A, crushing solid wastes obtained by separating tunneling gangue and/or coal gangue until the granularity is small than 0.1m and bagging by adopting plastic woven bags to obtain gangue bags; B, conveying the gangue bags obtained in the step A to the position of a working surface, which is used for building an entry, through an underground conveying system and fixing the gangue bags for building a roadside gangue bag wall body to form a gob-side entry; C, arranging the gangue bag wall body into a plurality of steps with different heights; and D, building the gangue bag wall body to the designed position and height and then mounting anchor bolts and paving a metal net, and simultaneously, paving a vertical protection steel belt, carrying out two-way anchoring or single-side pretightening in a large-pallet lane and keeping a gangue bag filling body in the gangue bag wall body in a three-dimensional stress state to achieve the functions of increasing the side pressure of the gangue bag filling body and improving the strength and the rigidity of the filling body.

The invention discloses a three-dimensional in-situ stress testing method by acoustic emission method, comprising the following steps: 1) sampling and processing; 2) uniaxial acoustic emission test; 3) drawing a stress-accumulated acoustic emission ringing count-time curve; 4) Quickly discriminate the Kaiser effect points; 5) Calculate the three-dimensional stress state of the in-situ stress measuring points. The rock specimen sampling direction angle of the invention is flexible, the Kaiser effect point identification is quick and easy, the error in the calculation result of the in-situ stress caused by the deviation of the sampling angle is reduced, and the accuracy of the original rock stress test is also ensured.

The invention discloses a method for determining the three-dimensional stress based on single drilled rock's deformation measurement, comprising: A) constructing a horizontal testing hole: smoothening the hole bottom center of the testing hole; B) performing hole bottom stress removing work: installing a quadruple-component strain cluster on the already smoothened hole bottom of the testing hole to obtain the positive strain change values in different directions; C) performing partial wall face stress removing work: selecting a partial wall face from the side of the drilled hole away from the hole bottom for polishing process and obtaining two groups of hole wall positive strain values in eight directions after the measurement; and D) organizing and analyzing the data: in combination with the positive strain change values in different directions obtained from the stress removing work on the hole bottom and the side wall face of the testing hole, obtaining the three-dimensional stress state of a measurement spot. According to the method, it is possible to ensure that the stress measurement work at a measurement spot is completed in a relatively small rock scope, which avoids the influence of the heterogeneous factors of the rock characteristics on the measurement result, therefore, increasing the reliability of the measurement result.

The invention relates to an asymptotic variational method-based method for simulating and optimizing a composite material laminated plate, which belongs to the field of analysis of material mechanics. The method specifically comprises the following steps of: constructing a three-dimensional plate energy equation represented by a one-dimensional generalized strain and warping function on the basisof a rotation tensor decomposition concept; strictly splitting the original three-dimensional problem analysis into nonlinear two-dimensional plate analysis and cross-section analysis along a thickness direction on the basis of an asymptotic variational method; asymptotically correcting an approximate energy functional of a reduced-order model to a second order by using the inherent small parameter of the plate and converting the approximate energy functional into the form of Reissner model for practical application through an equilibrium equation; accurately reconstructing a three-dimensional stress/strain/displacement field by using an obtained global response asymptotic correction warping function; and optimizing the composite material laminated plate by using an optimization strategy of bending and torsion rigidity coefficients obtained by maximization cross-section analysis. The method has high practicability and high generality, and the resolving speed and efficiency of this type of problems can be remarkably increased.

The invention relates to a three-dimensional stress test device for a single-hole multi-point hollow fiber grating inclusion in rock mass engineering. The three-dimensional stress test device is mainly composed of two or more unit fiber grating cylindrical hollow inclusion stress gauges, rigid connection rods, centering supports, a wavelength demodulator and a computer. The unit fiber grating cylindrical hollow inclusion stress gauges are composed of epoxy resin hollow inclusion bodies, rigid connection end rings, fibers and gratings. The fibers are fixed into axial grooves, radial grooves and spiral grooves in the outer surfaces of the stress gauges in a wound mode. The test device is installed to a drill hole in a rock mass and coupled with the part, located on a drill hole wall, of the rock mass through slip casting fluid, so that testing of three-dimensional disturbance stress distribution and testing of the time-space evolution law of three-dimensional disturbance stress distribution in the rock mass engineering are achieved. As the fiber grating technology and the hollow inclusion technology are coupled, the test device is resistant to corrosion, groundwater interference and electromagnetic interference and high in test accuracy, has high adaptability to complicated geological and hydrological conditions in the rock mass engineering and can be widely applied to three-dimensional disturbance stress tests for underground tunnels and slope rock masses in water conservancy and hydropower engineering, mine engineering, traffic engineering and the like.

The invention discloses an on-line detecting method for three-dimensional force in closed iron magnetic shell, which adopts Barkhausen magnetic noise detection device, applies variable-frequency electromagnetic excitation and rotating electromagnetic excitation to the iron magnetic shell to be measured, to obtain electromagnetic MBN, MAE signals at different depths in the iron magnetic shell body, performs three-dimensional rebuilding to the MBN, MAE signals, and ultimately detects the three-dimensional stress and flaw distribution in the iron magnetic shell to be measured. The invention has beneficial technology effects of simple operation, wide application range, non harm to human body during operations, and capability of performing three-dimensional scanning and detection to the internal stress and defect in the iron magnetic shell.

The invention provides a device and a method for testing a forming limit of a sheet material in a three-dimensional stress state, relating to the device and the method which are used for testing the forming limit of the sheet material. Aiming to the problems that the forming limit of the sheet material in the three-dimensional stress state is difficult to test and an influence of normal pressure to the forming limit is difficult to estimate, the device comprises an upper die and a lower die. In a test, a fluid medium is injected into the lower die, a test sample of the sheet material is placed, mold clamping force is applied, the fluid medium is injected into the upper die, and pressurized deformation is carried out by controlling pressure in the upper die and the lower die in sequence. Braking strains of the test sample of the metal sheet material can be calculated according to measured data before and after circular or square mesh deformation, namely epsilon 1=Ln[d1-d/d] and epsilon 2=Ln[d-d2/d]; a plurality of groups of different limit strain data points can be obtained by changing a ratio of a long shaft to a short shaft of an oval cross section of a cavity; and the obtained data points can be connected or fitted by respectively using the epsilon 1 and the epsilon 2 as a transverse coordinate and a vertical coordinate, so as to obtain the sheet material forming limit curve at the three-dimensional stress state at a certain normal pressure condition to estimate the influence of the normal strain to the forming limit in the three-dimensional stress state.

The invention provides an apparatus for testing a three-dimensional stress state inside soil. Six routine soil pressure boxes of the apparatus are respectively arranged at six side surfaces, apart from an upper surface and a lower surface which are parallel to each other, of an octahedral pedestal, gaps between the routine soil pressure boxes and the octahedral pedestal are filled with expansion water seal rubber rings, a soil pressure box data lead is connected with a soil pressure box element measuring reading device, and the gap between the soil pressure box data lead and the octahedral pedestal is filled with a polyurethane foam filler for waterproof sealing. The invention simultaneously provides a test method using the apparatus. The apparatus and method have the following advantages: the apparatus is visual in test, clear in calculation method, reasonable in structure, simple to operate and low in cost, errors caused by a conventional stress calculation mode are improved, if it is assumed that precision of a conventional soil pressure box is rho, the test precision of three kind of main stress through calculation is 1.0 rho, the test precision of three kind of shearing stress is 1.22 rho, and the average test precision is 1.11 rho. Improvement of precision can accurately reflect stress state of the soil and improves emergency capacity of engineering.

The invention discloses a coal bed mining floor grouting infiltration-reducing simulation testing system, belonging to the field of the deep rock mass engineering technology. The coal bed mining floor grouting infiltration-reducing simulation testing system comprises a testing machine, a grouting system and a water pressurizing system, wherein the testing machine comprises loading mechanisms arranged in X, Y and Z directions of the testing machine, the telescopic shaft of the loading mechanism penetrates through the outer wall of the testing machine, the inner end of the telescopic shaft is fixedly connected with a pressurizing plate, the edge periphery of the pressurizing plate is wrapped by a rubber binding band, the grouting system is connected with the testing machine by a connecting plate, and the water pressurizing system is connected with the testing machine by a pressurized water feeding device of a hydraulic system. The coal bed mining floor grouting infiltration-reducing simulation testing system has reasonable design, can vividly simulate the coal bed mining grouting phenomenon in high-pressure underwater under a condition of three-dimensional stress loading, and can achieve the good effect.

The invention discloses a three-dimensional slip-casting model test servo control system and a testing method. Based on a mechanical loading method, a disturbed rock soil body is re-molded, and the injected rock soil body which is analogous with the undisturbed soil is formed; an axial and circumferential flexible loading method is employed, and the injected rock soil body is in a three-dimensional stress state, so that the stress environment of the soil body can be simulated in a real mode; a high pressure oil-chamber sealing technology is employed, and a testing chamber can bear high slurrypressure, so that the slip-casting pressure can be simulated in the real mode; a mechanical method is employed for fixing a drilling tool, the drilling smoothness is increased, a sample is effectivelyprotected from being disturbed or less disturbance, and the slip-casting solid sampling quantity is increased.

The invention discloses a method for manufacturing multi-core MgB2 superconductive wires through the extrusion technology. The method includes the steps that first, precursor powder is prepared; second, the precursor powder is installed in a pipe to prepare a primary complex, and single-core wires are obtained through drawing machining; third, the precursor powder is installed in a pipe to prepare a secondary complex; fourth, the secondary complex processed through pre-heating seal welding is extruded, and multi-core rods are obtained; fifth, the multi-core rods are stripped and drawn to obtain multi-core wires, the multi-core wires are subjected to heat treatment, and then the multi-core MgB2 superconductive wires are obtained. According to the method, on the basis of a traditional power pipe-installing technology, a large single-pass machining deformation amount is adopted for manufacturing the multi-core MgB2 superconductive wires, in other words, the extrusion technology is adopted for manufacturing the multi-core MgB2 superconductive wires, because the secondary complex is in a very favorable three-dimensional stress state in extrusion, good metallurgical bonding will be achieved between different metal interfaces in the secondary complex along with the large extrusion deformation amount, the manufactured multi-core rods are high in composite strength, and the compactness and the yield strength of the multi-core MgB2 superconductive wires can be significantly improved.

The invention relates to a method for obtaining a three-dimensional stress field of a rock mass model including a complex structural plane by using a rapid prototyping technology. The method comprises: (1), a stress frozen fringe value of a rapid prototyping material is measured and an optimal frozen temperature is determined; (2), a rock mass structural plane network system and a rock mass CAD model are generated; (3), rock model checking and printing are carried out; (4), stress freezing is carried out; (5), model slicing is carried out and a stress fringe value is measured; and (6), a rock mass model stress field is reconstructed. According to the invention, on the basis of the complicated building technology of the 3D printer and the photo-elastic measuring technology, two limiting factors that a rock mass model including a complex structural plane can not be manufactured easily and distribution of inner stresses of the rock mass belongs to the black box in the prior art can be eliminated and thus observation and measurement can be carried out by using the common testing means, so that development of the model testing can be promoted. Therefore, the method has the important application value in researches of the rock mass mechanical behavior.

The invention discloses a three-dimensional simulating method for goaf fracture ring morphology. The method comprises the steps that according to the space similarity ratio between a coal seam and overlaying rock and time similarity ratio of coal seam working face propelling, a three-dimensional similar simulation test body is manufactured; according to the site mining working face ground stress situation and the mining sequence, the dynamic process of coal mine working face propelling under the three-dimensional stress condition is simulated; an embedded stress sensor is utilized for monitoring stress changes of a top plate and a bottom plate of a goaf in the mining working face propelling process, and a dynamic resistance strain gauge is utilized for recording data; after mining working face propelling simulation is finished, a tracer agent labeling method is used for carrying out drilling to pry and observe the goaf fracture morphology of the simulation test body, the top plate and the bottom plate of the goaf are separated layer by layer and section by section, and statistics is carried out on fracture data of all layers and all sections; according to the statistical fracture data, three-dimensional software is utilized for drawing a goaf fracture ring morphology simulation image. The method has the advantages that a three-dimensional mode is adopted for simulating the goaf fracture development morphology, and therefore the position of extraction holes can be determined conveniently and accurately.

The invention discloses a seepage experiment system for gas-containing coal under the action of an impact load. The system comprises a coal sample fixing device, an impact load applying device as well as a high-pressure gas source device, an axial pressure loading device, a confining pressure loading device, a vacuumizing device and a metering and data acquisition device connected with the coal sample fixing device, wherein the impact load applying device is a split Hopkinson pressure bar device. The split Hopkinson pressure bar device is adopted to apply the impact load for simulating rock burst, three-dimensional loaded conditions of coal-rock masses in coal mine can be simulated by applying different axial stresses and radial stresses, and seepage experiment of a coal sample in a three-dimensional stress state under the action of the impact load is successfully carried out, so that the system has relatively important meaning in both theory and practice.

The invention provides a device based on a regular dodecahedron base and six common earth pressure cells. An earth pressure cell groove is formed in the six faces, non-parallel to each other, of the regular dodecahedron base respectively; the six common earth pressure cells are fixed on the six grooves respectively; the gap between each groove and each common earth pressure cell is filled with an expansion water stop ring; a wire hole for guiding a data wire of the common earth pressure cell to the center of the regular dodecahedron is formed in each groove; a wire gathering hole is formed in any face of the regular dodecahedron base without a groove; and the data wire is connected with an earth pressure cell testing and reading element. The invention also provides an operation method of the regular dodecahedron-based three-dimensional stress state testing device. The beneficial effects are as follows: the stress state of a point in an earth body is accurately and conveniently obtained, the error of the traditional way of pasting a strain rosette to reflect stress is improved, and the average test precision is 0.81rho. Through the precision improvement, the conventional stress state of the earth body can be reflected more accurately, and the safety stock of a project is improved.

The invention discloses a three-direction loading large-scale three-dimensional analog simulation test counterforce system which comprises an underground concrete counterforce pool and a counterforce frame fixed with the counterforce pool. The system is capable of simulating complex distribution of coal seam stress in different top plate moving stages during underground excavation, manufacturing large-inclination-angle ore bed test pieces is more convenient and effective, rock mass can be stored under the conditions of three-dimensional stress in the whole mining process, and underground space excavation under more operating conditions can be researched. In addition, the aboveground height of the whole system is decreased, and the system is lower in manufacturing cost and more stable.