17 results about "Shear displacement" patented technology

The invention belongs to the technical field of direct shear-seepage tests of rock joints, and discloses a numerical test method for direct shear-seepage of rock joints under different boundary conditions, which comprises the following steps of: establishing a joint surface numerical model by using finite element software, and performing tests for simulating joint shear mechanical behaviors by applying different boundary conditions. And the contact state and the opening distribution of the joint surface under different shear displacements are obtained, so that the shear stress evolution mechanism of the joint surface is better revealed, and the mechanical behavior of the rough joint surface in the shear process is accurately expressed. According to the method, the evolution law of mechanical properties in the joint shearing process can be reflected, the influence of shearing deformation on the joint seepage characteristics can be reflected, joint opening data distribution is imported into programming software to be processed, a joint seepage numerical model is constructed, then multi-physics field simulation analysis software is imported, and the joint seepage performance is improved. The flow velocity, the osmotic pressure and the streamline distribution characteristics in the flowing process are calculated, so that the joint permeability characteristics are analyzed.

The invention discloses a loess-mudstone landslide sliding grading displacement measurement method and system, and the method comprises the following steps: collecting the multi-point displacement data of a landslide body, and carrying out the preprocessing of the data, and generating a standardized multi-measurement-point displacement data sequence; obtaining overall and local deformation states; extracting evolution trend, space consistency and sliding loss features to form a displacement feature set; inputting an improved continuous time hidden Markov landslide state model, and generating a sliding state evolution sequence; analyzing the evolution sequence to generate a grading judgment result; an included angle threshold method and a shear displacement gradient method are adopted to recognize a concave-convex body and a sliding belt, and a key area identification result is generated; and outputting a sliding grading judgment result, a displacement feature set and a key area identification result. According to the invention, fine grading identification of the landslide state and accurate locking of the key area are realized, and the accuracy and foresight of monitoring and early warning are improved.

The application provides a method and device for predicting normal displacement of soft rock joint surface, electronic equipment and medium. The method comprises the following steps: firstly, determining residual shear dilation angle of the joint surface and displacement maximum value of the soft rock in the elastic stage; if the shear displacement is less than or equal to the displacement maximum value of the soft rock in the elastic stage, determining the first joint surface closure displacement according to the shear displacement and the shear closure coefficient, and obtaining the predicted joint surface normal displacement; if the shear displacement is greater than the displacement maximum value of the soft rock in the elastic stage, determining the opening displacement caused by the joint surface climbing effect according to the shear displacement, the normal stress, the residual shear dilation angle and the displacement maximum value of the soft rock in the elastic stage; determining the second joint surface closure displacement according to the opening displacement and the shear closure coefficient; and taking the sum of the opening displacement caused by the joint surface climbing effect and the second joint surface closure displacement as the predicted joint surface normal displacement. The application can predict the joint surface normal displacement according to the size of the shear displacement.

The application discloses a kind of applied loess-mudstone landslide sliding grading displacement measurement method and system, including the following steps: collecting landslide body multi-point displacement data, pre-processing generates standardization multi-measurement point displacement data sequence;Obtain overall and local deformation state;Extract evolution trend, spatial consistency and sliding loss characteristics, form displacement feature set;Input improved continuous time hidden Markov landslide state model, generate sliding state evolution sequence;Analysis evolution sequence generates grading determination result;Adopt angle threshold method and shear displacement gradient method to identify concave-convex body and sliding zone, generate key area identification result;Output sliding grading determination result, displacement feature set and key area identification result.The application realizes landslide state fine grading identification and key area accurate locking, improves the accuracy and foresight of monitoring and early warning.

The application provides a kind of pipe network engineering construction period intelligent remote monitoring method and system, related to underground space engineering safety technical field.The application obtains the transient dynamics parameters such as pipe network interface shear displacement, displacement rate and soil pore water pressure around pipe, and constructs system state vector and control vector by combining with construction machinery and grouting system operation boundary parameter, accurately reflects real-time dynamics state of pipe network;With pipe-soil coupling dynamics state evolution equation as constraint, with the minimum pipe network state deviation and control energy consumption as target to construct Hamilton function, and based on the pontryagin principle to solve the optimal control solution, realize the rapid deduction and global optimal control decision of pipe network deformation trend;Finally, the synchronous control instruction of mechanical frequency reduction and grouting pressurization is generated, which can complete active collaborative intervention in a very short time when high-frequency shear impact occurs, inhibit the transient shear deformation of pipe network interface, avoid interface shear separation damage, and reduce control energy consumption.

The invention discloses a coal and rock mass tension-shear deformation decoupling monitoring method, system and equipment based on a generalized equivalent geometric model and a medium, and relates to the field of coal mine rock mechanics monitoring, the method comprises the following steps: collecting a Brillouin frequency shift signal of each analysis unit to obtain the total optical fiber axial strain of each analysis unit; for any analysis unit, obtaining a real dislocation displacement vector to be determined according to the initial length and the deformation length; decomposing a real dislocation displacement vector to be determined into a projection component and equivalent shear displacement along the axial direction of the optical fiber; forming an equivalent right triangle model based on the initial length, the deformation length, the projection component along the axial direction of the optical fiber and the equivalent shear displacement; obtaining a tension-shear coupling equation based on the equivalent right triangle model; and based on the total axial strain of the optical fiber of the analysis unit, determining equivalent axial strain and equivalent shear displacement by adopting a tension-shear coupling equation. According to the method, accurate decoupling of the complex tension-shear deformation field of the coal and rock mass is realized.

This invention provides a numerical simulation method and system for irregular contact between the inner wall and lining of a pipeline. The method includes: first, establishing a three-dimensional model of the pipeline and the lining, assembling and positioning them, and extracting the inner wall of the pipeline and the outer wall of the lining as the contact interface, and establishing corresponding contact pairs; defining tangential contact properties for the contact pairs, specifying a user-defined friction subroutine, and setting user parameter arrays and state variable arrays; then, constructing an interface friction constitutive model based on the frictional physics mechanism of the contact interface; during the finite element incremental analysis, obtaining the current normal pressure, shear displacement increment, state variables, and user parameters through the user-defined friction subroutine, calculating the interface trial shear stress of the current incremental step, and determining the actual shear stress and corresponding tangential stiffness of the interface based on the contact state; and writing the historical relevant data of the current incremental step into the state variable array for subsequent incremental steps to call. This invention can more reasonably characterize the interface shear stress, slip state, and contact evolution process.

This invention relates to the field of marine geotechnical engineering technology, and provides a method and system for monitoring the shear state of calcareous sand based on acoustic emission centroid frequency. The method includes conducting a ring shear test on the calcareous sand to obtain the shear stress-shear displacement curve during the shearing process; attaching an acoustic emission sensor to the loading plate of the ring shear tester and using an acoustic emission monitoring system to collect acoustic emission signals during the shearing process; performing impact detection on the acoustic emission signals and extracting the waveforms of the impact signals; calculating the average centroid frequency of all impact waveforms within each preset time period; and based on the change in the average centroid frequency, analyzing the micromechanical mechanism of shearing in the calcareous sand and providing early warning of shear zone development and failure. This method can monitor the shear state of calcareous sand throughout the entire process and can be used for early warning of shear failure in calcareous sand foundations and other sandy soil materials in marine engineering.

The invention relates to the technical field of geological disaster monitoring, and particularly discloses an automatic geological disaster monitoring device which comprises a bottom plate, a mounting frame is fixedly connected to the top end of the bottom plate, a displacement monitoring unit and a positioning unit are arranged in the mounting frame, and a mounting table is fixedly connected to the top end of the mounting frame. An environmental parameter monitoring unit and an integrated displacement, environment, geomechanics and other multi-dimensional monitoring unit are arranged on the upper side of the mounting table, so that the stability state of a geologic body is comprehensively reflected, and the limitation of single parameter monitoring is avoided; through a distributed optical fiber sensor, a GPS positioning module, a tilt angle sensor, a rainfall sensor, a temperature and humidity sensor, a soil pressure sensor, a pore water pressure sensor, a shear displacement sensor and the like, information in multiple aspects such as displacement, environmental parameters and geomechanical parameters of a geologic body can be acquired at the same time, so that the stability of the geologic body is evaluated more accurately and comprehensively; and a more reliable basis is provided for early warning of geological disasters.

This invention belongs to the field of power technology and discloses a prefabricated rock anchor foundation for transmission lines, comprising a prefabricated base plate, prefabricated side plates, connecting steel plates, connectors, and anchor bolts; its key feature is that it also includes longitudinal reinforcement, grouting holes, anchor bolts, prefabricated upper main columns, adjusting nuts, prefabricated lower main columns, concrete dripping, steel mesh, and mortar. This invention has the following main beneficial technical effects: it defines damage variables and plastic shear displacement relationships to simulate the shear stress and shear displacement relationships of the contact surface under different shear slip models; through single-anchor simulation tests, it verifies that the tabular damage evolution form of bonded contact can effectively reflect the residual shear strength characteristics still existing after contact interface damage, and the tabular damage evolution form is closer to the actual situation than the simulation results; overall simulation was conducted, and by analyzing the bearing capacity of each stage of the foundation and the stress conditions of each component, the reliability and rationality of the modeling method were verified.

The invention discloses a visual test device for the shearing-seepage process of a shale filled rock joint, and relates to the field of rock engineering mechanical property testing and seepage physical simulation. A loading module in the device is used for applying a normal load and a shearing displacement load to a rock sample; the shear seepage box is used for accommodating a rock sample; the seepage water control module is used for providing seepage water for cracks of the rock sample; the multi-camera imaging module comprises a plurality of top cameras and a plurality of side cameras; the image fusion resolving module is used for performing image calibration, image synthesis, recognition of seepage channels in the images and particle migration analysis according to the images of the different sub-regions of the observation surface and the side observation image of the observation surface to obtain an evolution result of the seepage process; under the condition of simulating in-situ complex stress (normal and shearing), multi-view, whole-process and high-fidelity optical visual observation and image resolving analysis of the shearing-seepage coupling process of the argillaceous filling joint fissures can be realized.

The utility model relates to an in-situ test device for mechanical properties of a concrete and rock mass bonding interface. The method is suitable for the technical field of geotechnical engineering. According to the technical scheme, a concrete test block is poured on a rock mass; the test box is arranged around the concrete test block, and the test box is fixed on the rock mass; the shearing force loading mechanism is used for applying shearing force to the concrete test block in the front-back direction; the shear displacement acquisition mechanism is used for acquiring the shear displacement of the concrete test block; the normal force loading mechanism is used for applying normal force to the concrete test block through the pressing plate mechanism; the pressing plate mechanism comprises an upper pressing plate and a lower pressing plate, the upper pressing plate is connected with the normal force loading mechanism, the upper pressing plate can be movably pressed on the lower pressing plate along the front-back direction through a low-friction mechanism, and the lower pressing plate is adhered to the upper surface of the concrete test block; the normal displacement acquisition mechanism is used for acquiring the normal displacement of the concrete test block; and the data acquisition instrument is connected with the shear displacement acquisition mechanism and the normal displacement acquisition mechanism through data lines.

The present application belongs to the field of geotechnical test, and provides a shear stress correction method for large-scale direct shear test of different size cylindrical samples, which is based on a large-scale direct shear apparatus for different size cylindrical samples, according to the structural features of a shear box and the test principle of the direct shear test, the stress condition of the shear box is determined, the horizontal static equilibrium equation of the shear surface is determined by using the relevant theory of statics, the change condition of the actual shear area of the shear box is derived, the shear stress correction formula for the large-scale direct shear test of different size samples is further derived, the test error is eliminated, and the relationship curve between the corrected shear displacement and the shear stress is established, so that the shear strength of the soil body is accurately determined.

The present application relates to the technical field of concrete structure monitoring, and particularly relates to a sewage plant underground concrete structure group stability monitoring method. The present application can directly reflect the comprehensive response state of the underground structure under the water-soil coupling effect by synchronously collecting four types of physical quantities, i.e. concrete strain value, water-soil interface pressure value, interface shear displacement value and steel stress value, and laying monitoring points according to the differences in failure mechanism of different key positions, thereby improving the comprehensiveness and pertinence of monitoring. The present application further calculates a risk index by combining the abnormal occurrence frequency and the physical property change rate of the abnormal synergy zone, and outputs a graded early warning signal and a corresponding abnormal synergy zone spatial distribution map based on the risk index, thereby realizing visual early warning and helping the operation and maintenance personnel to quickly locate the risk and develop a response strategy.

The invention provides a rock-soil interlayer movement monitoring system, relates to the field of intelligent monitoring, and adopts an artificial intelligence analysis technology based on deep learning. And analyzing data of pore water pressure values, vertical displacement values, horizontal displacement values and shear displacement values of the rock-soil layer to be monitored at multiple time points so as to judge whether the rock-soil layer is in a stable state or not. Therefore, the motion state of the rock-soil layer can be accurately judged, and an important reference basis is provided for disaster early warning and decision support.

This invention provides a method and system for analyzing the local shear contribution of a rough structural surface, belonging to the field of structural mechanics. The method includes: acquiring structural surface response data reflecting the evolution of the shear response during shear loading of the rough structural surface; identifying multiple local shear contributing entities formed during the shear process, where each local shear contributing entity is a local region of the structural surface that plays a dominant role in the overall shear resistance; tracking the change in the load-bearing state of each identified local shear contributing entity with the evolution of shear displacement during shear loading, and obtaining the corresponding shear response characteristics; and determining and outputting the contribution relationship of each local shear contributing entity to the overall shear resistance of the rough structural surface based on the shear response characteristics and corresponding spatial distribution relationships of each local shear contributing entity. This invention provides a clear identification and analysis of key local load-bearing regions and their evolution relationships in the overall shear resistance of a rough structural surface.