124 results about "Horizontal shear" patented technology

The invention relates to a rock multi-surface direct shear test system and method considering fluid-solid coupling, and relates to the field of rock mechanics and seepage mechanics. Comprising a true triaxial loading frame which is used as a supporting frame of a test system and is used for clamping a sample and realizing a true triaxial stress state; the shear loading device is arranged in the true triaxial loading frame and is used for independently applying a horizontal shear load; the seepage module is connected with the true triaxial loading frame and is used for feeding fluid into the surface of the sample; the data acquisition system is used for monitoring and recording stress, strain, displacement, acoustic emission signals and seepage parameters in the test process in real time; and the servo control system is used for coordinating and controlling static loading, shear loading and seepage processes. According to the invention, the loading precision is improved, more real test conditions are provided for safety assessment of deep rock mass engineering and geological disaster prevention and control, and the device has important engineering application value.

The invention relates to a wind power tower bending shear torsion test loading anti-interference decoupling switching integrated device, which comprises a reaction wall, a support, a reaction column, a reaction longitudinal beam, a reaction cross beam and four actuators, and is characterized in that the top end of a fixed tower on the support is connected with a loading beam through a switching device; the first actuator applies axial load to the tower drum through the loading beam and the switching device, the second actuator and the third actuator apply bending moment to the end of the tower drum through the loading beam and the switching device, the fourth actuator is matched with the connecting piece, the rectangular steel plate is connected with the switching device to apply horizontal shearing force and torque to the end of the tower drum, and application and decoupling of various types of loads are achieved. The test precision is ensured; the device can truly simulate the load condition of the tower drum section, can also be matched with the loading beam to transmit the axial force, the bending moment, the shearing force and the torque to the wind power tower drum, and effectively solves the influence of horizontal displacement and torsional deformation on loading in the horizontal and vertical load coupling loading process in the wind power tower drum composite load simulation test.

A structural beam and deck assembly containing portions of beam members interconnected by a deck assembly. Beam members have horizontal top and bottom flange elements interconnected by one or more vertical web member. The top flange of the beam members is serrated such that a series of serrations protrude horizontally in at least one direction from a top of the one or more vertical web member or are cut-out from the flange of a rolled shape. Adjacent beam and deck assemblies are installed such that attachment of one portion of a beam member to another results in the completed cross section of the beam member. In one embodiment, the serrated top flange and at least a portion of the web member are intended to be encased by a horizontal concrete slab. The slab material is capable of encasing all exposed surfaces of and curing around each serration to transfer horizontal shear forces between the serrated top flange and the slab material such that the beam members and slab behave compositely.

The application relates to an anti-seismic building pile foundation, and relates to the technical field of building pile foundations. The anti-seismic building pile foundation comprises a base body, the outer side of the base body is provided with a plurality of main support columns, a plurality of grooves are formed in the outer side surface of the base body and are fixedly connected with first fixing shells, one end of each main support column is fixedly connected with a first fixing block, the first fixing blocks are arranged in the first fixing shells respectively, and a secondary support column is arranged on the side surface of each main support column. Compared with a traditional single columnar pile foundation, the anti-seismic building pile foundation can disperse seismic loads in multiple directions, can transmit transverse seismic forces to a wider soil area through multiple levels of support, and can solve the problems that the anti-seismic building pile foundation with a single columnar structure has limited horizontal shear resistance, is prone to pile body fracture and inclination under the action of strong seismic loads, and the problems are more prominent, especially in soft soil foundations or high-intensity seismic areas.

The invention relates to the technical field of wind power generation tests, and discloses a wind power tower load loading test device and an evaluation system.The wind power tower load loading test device comprises a test bed, a loading structure and a load actuation structure; by arranging the loading structure and the load actuating structure, vertical axial force, bending moment, horizontal shearing force and torque can be applied to a test piece at the same time, and the test device is closer to the actual stress working condition compared with a traditional loading mode, so that the accuracy and reliability of test data are improved; the first actuator is arranged perpendicular to the upper end face of the loading piece so as to simulate the axial load and bending moment effect borne by the wind power tower in the operation process. The second actuator is arranged perpendicular to the side face of the loading part so as to apply shearing force and torque, multi-dimensional combined loading is achieved, and mechanical property analysis of complex load combination is facilitated; the loading mode is controlled through the actuator, the controlled and accurate load applying process is achieved, manual intervention is reduced, and the test efficiency and consistency are improved.

The invention discloses an X-ray three-dimensional imaging-based II-type and III-type crack in-situ testing device and method, belongs to the technical field of crack in-situ testing, and solves the problem that an existing crack in-situ testing device only tests I-type cracks and cannot test II-type and III-type cracks. The device comprises a tension-compression fatigue testing machine, a clamp main body and an X-ray monitoring assembly. Through the collaborative design of the translation reversing mechanism, the rotary reversing mechanism and the reversing switching piece in the clamp main body, the single vertical motion of the loading rod piece can be flexibly converted into horizontal shearing motion for testing type II cracks or rotary motion for testing type III cracks; therefore, in-situ testing of three basic crack types by one device is realized, the application range of the device is greatly expanded, the testing efficiency is improved, and a key experimental tool is provided for studying fatigue fracture behaviors of materials under multi-mode loads.

The invention discloses a method for calculating horizontal bearing deformation of a pile bucket foundation based on a multi-spring model. The method comprises the following steps: determining geometric parameters, soil body parameters and load parameters of the pile bucket foundation; according to a pile barrel foundation structure, foundation segmentation treatment is conducted, and the foundation is divided into a barrel reinforcing section and a barrel non-reinforcing section; establishing four spring models of the pile barrel foundation; determining the position of the rotation center; establishing and discretizing a control equation; and carrying out nonlinear equation set solution, and outputting a converged load-displacement curve and other distribution maps through iterative solution. According to the method, the p-y springs, the side impedance torque springs, the foundation anti-torque springs and the foundation horizontal shear springs are introduced, foundation failure modes and soil body constraint conditions under different pile barrel combinations can be fully considered, and the accuracy of calculation of the horizontal bearing deformation parameters of the pile barrel foundation is ensured.

The utility model relates to a transverse impedance multidirectional damping steel spring device which comprises a spring outer sleeve (1), a steel spring (5) and a spring inner sleeve, the spring inner sleeve comprises a spring inner sleeve cover (2) and a spring inner sleeve base (6), and a transverse impedance elastic body (3) for transverse limiting is arranged between the spring outer sleeve (1) and the spring inner sleeve base (6). Compared with the prior art, three-direction damping amplification is adopted, besides the main vibration isolation direction, the stability and vibration in the direction perpendicular to the main vibration isolation direction of the spring can be controlled, and meanwhile the problem that the spring is subjected to transverse shearing dynamic load to cause fatigue fracture and failure of the spring is solved; therefore, the transverse stability and reliability are improved, and the service life of parts is prolonged.

The application discloses a strong node connecting structure system of a fabricated concrete structure, relates to the technical field of building node connecting, and comprises a foundation column connecting assembly fixedly installed at the end of a foundation assembly, a column connecting assembly fixedly installed at the end of a column assembly, a beam connecting assembly fixedly installed at the end of a beam assembly and a beam-column node connecting assembly, the foundation column connecting assembly is fixedly connected with the column connecting assembly, the column connecting assembly is fixedly connected with the beam-column node connecting assembly, and the beam connecting assembly is fixedly connected with the beam-column node connecting assembly. The square tube of the foundation column connecting assembly and the beam-column node connecting assembly is provided with a spline piece, which can effectively resist horizontal shear stress and seismic force; the beam connecting assembly and the secondary beam connecting assembly adopt a first upper connecting plate, a first middle connecting plate and a first lower connecting plate in a upper-middle-lower separated mode, and when the main beam and the secondary beam are subjected to tension at the upper part and compression at the lower part, the main beam and the secondary beam can bear load bending moment and resist torsional deformation.

The utility model discloses an anti-pulling and non-shearing connecting structure of a disassembly-free bottom die steel bar truss floor support plate, which comprises a disassembly-free template and a steel bar truss arranged on one side of the disassembly-free template, and further comprises a connecting piece, the connecting piece is respectively connected with the steel bar truss and the disassembly-free template, the connecting piece is rigidly connected with the steel bar truss, and the connecting piece is connected with the disassembly-free template. The connecting piece is flexibly connected with the non-dismantling formwork in the direction parallel to the plane where the non-dismantling formwork is located, and is rigidly connected with the non-dismantling formwork in the direction not parallel to the plane where the non-dismantling formwork is located. According to the utility model, the disassembly-free bottom die can be effectively prevented from cracking under the action of horizontal shearing force, and the durability is improved.

The invention relates to a rock high-frequency multi-surface direct shear test system and a rock high-frequency multi-surface direct shear test method considering fluid-solid coupling, and relates to the field of rock mechanics and seepage mechanics. Comprising a true triaxial loading frame which is used as a supporting frame of a test system and is used for clamping a sample and realizing a true triaxial stress state; the shear loading device is arranged in the true triaxial loading frame and is used for independently applying a horizontal shear load; the seepage module is connected with the true triaxial loading frame and is used for feeding fluid into the surface of the sample; the high-frequency dynamic disturbance device is arranged in the true triaxial loading frame and is used for applying a disturbance load; the data acquisition system is used for monitoring and recording stress, strain, displacement, acoustic emission signals and seepage parameters in the test process in real time; and the servo control system is used for coordinating and controlling static loading, shear loading, seepage and high-frequency dynamic disturbance processes. The invention provides a test system and method capable of comprehensively considering a fluid-structure interaction effect, high-frequency disturbance and multi-surface direct shear loading so as to overcome the defects in the prior art.

A method, system, device, and readable storage medium for predicting leading-edge bulging cracks are disclosed, relating to the field of geological disaster monitoring and early warning. Specifically, the method includes determining the active thrust of the landslide on the leading edge based on the landslide mass weight, sliding surface dip angle, seepage hydrodynamics, and additional thrust, wherein the additional thrust is generated by external dynamic disturbance. When the detected active thrust is not less than the passive earth pressure limit, the target vertical bulging displacement is determined based on horizontal shear displacement, maximum dilatation angle, geometric correction factor for shear zone thickness, hydraulic correction factor, initial effective stress, real-time effective stress, and dilatation angle stress sensitivity factor. The predicted leading-edge bulging crack result is determined based on the target vertical bulging displacement and the predicted vertical bulging displacement. This application can improve the accuracy and applicability of leading-edge bulging crack prediction.

This invention discloses a prefabricated staircase and its construction method, relating to the field of prefabricated building construction technology. By setting up the staircase body and two anchoring structures, under normal use, the anchoring structures provide sufficient vertical bearing capacity and horizontal shear resistance, ensuring the overall stability of the staircase. In the event of sudden disasters such as earthquakes, due to the presence of through-type anchor bodies within the anchor holes, when the stair slab participates in resisting lateral forces in the main structure, the shear force is mainly distributed to the load-bearing beam through the anchor bodies in the anchor hole area, rather than concentrated at the single lap interface between the stair slab and the load-bearing beam. This effectively avoids concentrated shear failure caused by the short column effect at the stair slab ends due to abrupt changes in stiffness, reducing the risk of brittle shear failure of the stair slab, thereby protecting the prefabricated staircase components from severe damage. The staircase is less prone to overall collapse or severe displacement, which helps maintain the relative unobstructed escape route during earthquakes and increases the possibility of safe evacuation.

The invention discloses a lift-off support structure, and relates to the technical field of supports. According to the main technical scheme, the lifting-off device comprises a lifting-off buckle cover, a lifting-off screw rod, a first plate body, a lifting-off clamping tenon and a supporting column body, wherein a lifting-off clamping groove is formed in one side of the lifting-off buckle cover; the lift-off screw rod is arranged on one side of the lift-off buckle cover; the first plate body is oppositely arranged on one side of the lift-off buckle cover, and the first plate body is connected to the lift-off screw rod in a sliding manner; the lift-off clamping tenon is arranged on the first plate body in a penetrating mode, and the lift-off clamping tenon is connected to the lift-off clamping groove in a sliding mode. The supporting column body is arranged on the side, away from the lift-off buckle cover, of the first plate body, and the supporting column body is connected to the lift-off clamping tenon. When an earthquake occurs, the lift-off clamping tenon is attached to the groove wall of the lift-off clamping groove. At the moment, the lift-off clamping tenon and the lift-off screw rod transmit horizontal shearing force together. The aims of reducing the fracture risk of the lifting screw rod, prolonging the service life of the lift-off support structure and improving the structural stability are expected to be achieved.

The utility model relates to the technical field of vibration isolation of constructional engineering, in particular to a support suitable for horizontal vibration isolation and vertical isolation of subway vibration, which comprises a platform upper connecting plate, a horizontal vibration isolation support arranged on the platform upper connecting plate, a vertical vibration isolation support, a horizontal anti-rotation system and a platform lower connecting plate, the vertical vibration isolation support comprises an upper cover barrel and an elastic element connected with the upper cover barrel, the top of the upper cover barrel is connected with the bottom of the platform upper connecting plate, the lower end of the elastic element is connected with the platform lower connecting plate, and the two ends of the horizontal anti-rotation system are connected with the platform upper connecting plate and the platform lower connecting plate respectively. The horizontal anti-rotation system is arranged on the periphery of the vertical vibration isolation support, the horizontal anti-rotation system can change along with compression or stretching of the vertical vibration isolation support, the horizontal vibration isolation support and the vertical vibration isolation support are connected in series, and meanwhile the horizontal anti-rotation system is arranged on the periphery of the vertical vibration isolation support. When the horizontal shear displacement of the horizontal shock insulation support occurs, the support disclosed by the utility model does not rotate as a whole.

The application relates to a kind of anti-interference decoupling switching integrated devices for wind power tower cylinder bending shear torsion test loading, including counterforce wall, support, counterforce column, counterforce longitudinal beam, counterforce crossbeam and four actuators, the top end of tower cylinder fixed on support is connected to loading beam through switching device, first actuator applies axial load to tower cylinder through loading beam and switching device, second, third actuator applies bending moment to the end of tower cylinder through loading beam and switching device, fourth actuator cooperates with connecting piece, horizontal shear and torque are applied to the end of tower cylinder through rectangular steel plate connected switching device, realize the decoupling of various types of load application, ensure test accuracy;The device can truly simulate the load condition of tower cylinder section, and can also transmit axial force, bending moment, shear and torque to wind power tower through loading beam, effectively solve the influence of horizontal displacement and torsional deformation on loading in the process of horizontal and vertical load coupling loading in wind power tower composite load simulation test.

The invention discloses a rock-fill particle cyclic shear test system and test method, and relates to the technical field of shear tests, the rock-fill particle cyclic shear test system comprises a test frame, a shear box assembly, a vertical loading device, a horizontal shear device and a data acquisition system. By adopting a rolling shaft structure, friction interference can be reduced, constant vertical stress can be accurately applied by combining the synergistic effect of a high-precision hydraulic pusher and a force transmission plate in the vertical loading device, and the horizontal shearing device can be used for shearing a workpiece through a second hydraulic pusher and a third hydraulic pusher. Dynamic simulation of a horizontal cyclic shear load under a complex stress path is realized, mechanical response of a rockfill body in an actual working condition is completely restored, a data acquisition system integrates a three-dimensional shear force sensor, a laser displacement sensor and a high-speed camera unit, a stress-displacement evolution process and particle motion mesoscopic characteristics can be synchronously captured, and the mechanical response of the rockfill body in the actual working condition is completely restored. And multi-dimensional coupling analysis can be realized in cooperation with a data processing terminal.

The utility model discloses a water turbine guide vane middle sleeve pressing plate device capable of preventing a bolt from being broken, which comprises a whole circular ring pressing plate (2) formed by combining two semicircular ring pressing plates (1), the whole circular ring pressing plate (2) is provided with fixing bolt holes (3) which are uniformly distributed and staggered with a splicing sectioning line of the two semicircular ring pressing plates (1), and each semicircular ring pressing plate (1) is provided with four fixing bolt holes (3). Fixing bolt holes (3) are formed in the two semicircular pressing plates (1), the fixing bolt holes (3) in the two semicircular pressing plates (1) are symmetrically formed relative to a splicing sectioning line, detachable fixing bolts (4) are arranged in the fixing bolt holes (3), four sets of limiting grooves (5) which are evenly distributed are formed in the outer edge of the whole circular pressing plate (2), the transverse sections of the limiting grooves (5) are semicircular, and special pins (6) for supporting the whole circular pressing plate (2) in the radial direction are arranged on one sides of the limiting grooves (5). Horizontal shearing force borne by the fixing bolts can be reduced, and the situation that the pressing plate bolts are broken is avoided.

The utility model discloses a novel damping device for an elevator main engine, which belongs to the technical field of damping devices and comprises a support component, the support component comprises a first support plate, a spherical hinge support plate is integrally arranged above the first support plate, a spherical core is hinged inside the spherical hinge support plate, and a second support plate is arranged above the spherical hinge support plate. A second support plate is integrally arranged at the top of the ball core; a plurality of groups of belleville springs are connected between the first support plate and the second support plate; and the honeycomb base plate is connected to the upper surface of the second support plate, and the center of the honeycomb base plate is fixedly connected with a threaded connecting rod. Three-degree-of-freedom bearing is achieved through the supporting assembly, vertical pressure, horizontal shearing force and torsional moment are borne at the same time through cooperation of a ball core and a sliding interface, a three-dimensional stress system is formed, meanwhile, load uniformization is achieved, stress distribution is uniform through the spherical surface contact design, and local stress concentration is avoided.

The invention relates to coarse-particle soil direct shear and repeated shear test equipment and a test method, and relates to the field of soil mechanics test equipment. According to the technical scheme, the friction detection and rolling mechanism outputs horizontal shearing force through the horizontal servo motor, the shearing force deducts extra friction force generated by related rolling parts through the friction sensor, and the reliability of test data is improved; the V-shaped embedded guide rail is matched with the V-shaped bearing seat, so that chipping abrasion is avoided, the shearing box mechanism is limited to only do one-way reciprocating motion, lateral movement deflection is prevented, vertical stress uniformity is guaranteed, the service life is prolonged, the maintenance cost is reduced, and automatic alignment can be achieved to improve efficiency; the conveying mechanism provides power and is matched with a motor and the like to achieve automatic operation, labor intensity and cost are reduced, and the automation degree is high; the shearing box mechanism in modular design is convenient to maintain, sample loading boxes of different specifications and types can be replaced, subsequent maintenance is facilitated, and the experiment efficiency and the resource utilization rate are improved; the lifting foot margin mechanism is convenient to install, and a fixed floor does not need to be transformed.

The invention provides a calculation optimization method for an arch and cross beam combined section of a separated steel truss girder arch bridge, and belongs to the technical field of civil engineering, and the method comprises the following steps: determining a shear-resistant section according to the arch and cross beam combined section structure and a force transmission path, and determining main shear-resistant plates and welding seams; setting constraint conditions, and calculating to obtain vertical and horizontal shear forces of the shear-resistant section; solving the shear stiffness of a shear resistant plate and a welding seam by utilizing a shear stiffness calculation formula of a connecting plate of the arch and the cross beam and the welding seam after correction, and distributing shear force to calculate the force transmission of the plate and the welding seam; calculating the average shear stress of the force transmission plate and the weld joint, constructing a shear stress function, and calculating the maximum shear stress; introducing a strength check coefficient to judge a shear stress result, and optimizing the thickness of a combined section plate and the number of partition plates to obtain a structure optimization scheme; the method solves the problems that an existing arch and cross beam combined section optimization calculation method is huge in workload, complex in process and long in structure checking calculation time.

The present invention discloses a constant-resistance large-deformation force transfer cushion for shear keys of immersed tunnel joints and a design method. The constant-resistance large-deformation force transfer cushion is arranged between adjacent vertical or horizontal shear keys, and comprises a cushion box, a sleeve, a slip resistance member and a force transfer rod. The sleeve is fixed in the cushion box; the slip resistance member is arranged in the sleeve. A non-through hole is arranged in the slip resistance member along the vertical direction, and there is a distance between the bottom surface of the slip resistance member and the bottom surface of the cushion box; the upper end of the force transfer rod extends out of the sleeve, and its lower end is embedded in the hole and is in sliding fit with the hole; the slip resistance member is configured such that when the force transfer rod drives the slip resistance member to move downward, the slip resistance member is used to squeeze the sleeve to cause radial expansion thereof, so that a constant sliding friction resistance is generated between the slip resistance member and the sleeve on the extrusion surface. The present invention has multiple functions such as a large stable deformation amount, a high constant resistance, energy absorption, and the ability to control the internal force value received by the shear key, and solves the problems in the background art.

The present invention discloses an assembled exterior wall bridge waterproof and shear-resistant structure and construction method, comprising an exterior wall body and precast concrete components, wherein the precast concrete components include an upper precast component and a lower precast component, wherein the upper precast component is inlaid with a receiving groove on the side near the lower edge, and the lower precast component is inlaid with a closing groove on the side near the upper edge, wherein the receiving groove and the closing groove are located in the same vertical plane, and a waterproof fiber cloth is provided inside the receiving groove, with one end of the waterproof fiber cloth located inside the closing groove; a shear key is provided between the upper precast component and the lower precast component, wherein a through hole is provided in the middle of the shear key, and a grouting channel is provided above the shear key on the upper precast component. The present invention effectively enhances the anti-seepage ability at the concrete connection interface, enhances the vertical component connection and the horizontal shear resistance, and has a simple construction method, which is convenient for large-scale application.

A borehole sonic logging tool and method for imaging. The borehole sonic logging tool may comprise a transmitter configured to transmit a sonic waveform into a formation, wherein the transmitter is a dipole, and a receiver configured to record a reflected wave as waveform data, wherein the receiver is a quadrupole. A method may comprise disposing a downhole tool into a borehole, selecting a frequency range for the transmitter to a horizontally-polarized shear formation body wave, broadcasting the sonic waveform as the horizontally-polarized shear formation body wave into the formation penetrated by the borehole with the transmitter, recording a reflected wave on the receiver as waveform data, wherein the reflected wave is the horizontally-polarized shear formation body wave reflected from a reflector, and processing the waveform data with an information handling system.

The invention relates to the technical field of constructional engineering, in particular to an anti-seismic and heat-insulating integrated outer shear wall and a construction method thereof.The technical scheme includes that the anti-seismic and heat-insulating integrated outer shear wall comprises a structural layer, a heat-insulating layer and a structural layer, the structural layer is arranged as an outer layer of the outer shear wall, the structural layer is arranged as an inner layer of the outer shear wall, and the heat-insulating layer is arranged as an interlayer between the structural layer and the structural layer; the shear wall is characterized in that the shear wall comprises a structural layer and a thermal insulation layer, a low-carbon steel wire mesh sheet is arranged in the structural layer, anti-seismic pipe network structures are installed on the two sides of the thermal insulation layer in an embedded mode, and the anti-seismic pipe network structures are of a sectional structure. When the shear wall is subjected to seismic transverse waves, all parts of the anti-seismic pipe network structure can move transversely along with the seismic transverse waves, horizontal shear force generated by the wall body under the action of the transverse waves is effectively reduced, and when the shear wall is subjected to seismic longitudinal waves, all the parts of the anti-seismic pipe network structure can be compressed longitudinally along with the seismic longitudinal waves. And the compression force of the wall body under the action of longitudinal waves is effectively relieved.

The present invention discloses a greenable assembled retaining wall and a structural design method thereof. The greenable assembled retaining wall consists of a main wall, a foundation cushion layer and a drainage filling layer behind the wall, and the main wall is composed of standard concrete blocks stacked and assembled. The present invention is suitable for an assembled construction method and has an ecological greening function, and is suitable for urban road slope protection and ecological construction. The structural design method of the greenable assembled retaining wall comprises calculating the earth pressure on the greenable assembled retaining wall, preliminarily formulating the design parameters of the greenable assembled retaining wall, overall anti-slip stability verification, overall anti-overturning stability verification and foundation bearing capacity verification, anti-horizontal shear bearing capacity verification, local anti-overturning stability verification, block compression verification, determining retaining wall design parameters and formulating the stacking method of the standard concrete blocks. The theory based on this method is reasonable and the calculation process is simple, and the method can be used to guide the structural design of the greenable assembled retaining wall.

The application relates to a skate and a method for determining the friction coefficient of the skate. The skate comprises a shoe body, a blade, an upper connecting piece, a lower connecting piece and a sensor. The shoe body is connected with the upper connecting piece, and the blade is connected with the lower connecting piece. The sensor is located between the upper connecting piece and the lower connecting piece and is connected with the upper connecting piece and the lower connecting piece. The sensor is used for acquiring and sending the horizontal shear force and the vertical normal pressure between the upper connecting piece and the lower connecting piece. The sensor connected between the upper connecting piece and the lower connecting piece of the skate can acquire and send the horizontal shear force and the vertical normal pressure between the upper connecting piece and the lower connecting piece, and the friction coefficient between the skate and the ice surface can be calculated according to the horizontal shear force and the vertical normal pressure, so that the technical problem that the existing testing instrument cannot measure the friction coefficient between the skate and the ice surface in a dynamic process is solved. Meanwhile, the skate has the characteristics of simple structure, compactness and convenience in wearing.

The invention relates to a rock multi-surface direct shear test system and method under true triaxial stress, and relates to the field of rock mechanics and engineering geology tests. Comprising a true triaxial loading frame, a shear loading device, a data acquisition system and a servo control system, the true triaxial loading frame is used as a supporting frame of the test system and is used for clamping a sample and realizing a true triaxial stress state; the shear loading device is arranged in the true triaxial loading frame and is used for independently applying a horizontal shear load; the data acquisition systems are respectively arranged in the true triaxial loading frame and the shear loading device and are used for monitoring and recording stress, strain, displacement and acoustic emission signals in a test process in real time; and the servo control system is connected with the true triaxial loading frame and the shear loading device and is used for coordinating and controlling the static loading process and the shear loading process. According to the invention, the loading precision is improved, more real test conditions are provided for safety assessment of deep rock mass engineering and geological disaster prevention and control, and the device has important engineering application value.

The application discloses a kind of wood construction ancient building horizontal bearing stability evaluation method, comprising: step one, the mechanical property parameters of each wood component in wood construction ancient building are obtained;Step two, the three-dimensional entity geometric model of wood construction ancient building without column geometric defect is constructed;Step three, the measured inclination of each column in wood construction ancient building is measured;Step four, the mechanical simulation analysis model of wood construction ancient building without column geometric defect is established;Step five, the geometric defect of wood construction ancient building due to deterioration damage or / and external load action is simulated;Step six, the horizontal shear value of each column in wood construction ancient building is obtained;Step seven, column applies horizontal shear value, the stress state of wood construction ancient building is simulated;Step eight, the V j -U j Relationship curve of each column is drawn;Step nine, wood construction ancient building horizontal bearing stability index β v The application solves the technical problems that the traditional evaluation method is difficult to operate, has no quantitative index and is unsafe.

The invention belongs to the technical field of rock and soil mass mechanical tests, and particularly discloses a soil mass shearing device for testing the dynamic performance of deep-sea sedimentary soil and a test method. The invention discloses a soil body shearing device for testing the dynamic performance of deep-sea sedimentary soil. The soil body shearing device comprises a counter-force frame, a supporting assembly, a pressing assembly and a multidirectional loading assembly, the supporting assembly is slidably arranged on the counter-force frame, the test piece is located between the supporting assembly and the pressing assembly, the Z-direction loading piece is located on the top face of the pressing assembly, loads are applied to the test piece through the pressing assembly, and the X-direction loading piece and the Y-direction loading piece make contact with the side faces of the supporting assembly correspondingly, so that the loads are applied to the supporting assembly; therefore, the test piece can bear shear loads in the normal direction and the horizontal direction at the same time, the loading condition is closer to the earthquake action borne by an actual engineering site, the shear stress can be directly applied, the generated shear strain can be directly measured, and the problem that the dynamic performance of deep sea sedimentary soil cannot be conveniently tested at present is solved.