4 results about "Stress axis" patented technology

The utility model relates to an auxiliary sample bonding tool for a core material tensile shear test. Comprising a bottom plate, vertical plates are arranged on the two side edges of the bottom plate in the length direction, a jackscrew used for abutting against a bonding plate is installed on at least one vertical plate in a penetrating mode, positioning plates used for being in matched butt joint with a groove in one end of the bonding plate are arranged between the two vertical plates at intervals, and a moving gap used for moving of the bonding plate is formed between the two positioning plates. Through the structural design of the sample auxiliary bonding tool, the problems that in the prior art, when a core material and a testing tool are fixed in a manual bonding mode, the centering precision is low, the parallelism of two bonding plates and an adhesive layer are not uniform, visual adjustment depends on operators, strict parallelism of a sample and the stress axis of the tool is difficult to guarantee, and the working efficiency is high are solved. And the stress distribution is not uniform.

The application discloses a T-shaped damping inverted arch structure for a tunnel, which comprises a concrete partition wall, a drainage pipeline, a grid, a gravel layer, a concrete base and a spring damping device. According to the equal stress axis ratio theory, the excavation depth of the inverted arch structure is determined, the stability of the tunnel is ensured, the excavation positions are few, and the excavation disturbance area of the tunnel is reduced. The rubber concrete partition wall has a certain horizontal expansion and contraction, plays a damping role, and reduces the extrusion of the horizontal ground stress on the tunnel bottom, thereby reducing the tunnel bottom heave. The gravel layer arranged at the tunnel bottom uniformly disperses the force from the vehicle on the concrete base to the tunnel bottom, and is also beneficial to the drainage in the tunnel. The inverted arch structure adopts the rigid-flexible combination mode, provides a certain deformation space for the surrounding rock of the tunnel bottom, improves the stability of the tunnel bottom, and effectively controls the tunnel bottom heave.

The invention discloses a hidden active fault geometric parameter discrimination method based on multi-track InSAR and stress field constraint, and belongs to the technical field of remote sensing. The method comprises the following steps of: extracting a spatial connecting line with a maximum deformation gradient value as a fault agent trace by acquiring a rising and falling InSAR co-seismic deformation diagram of a target area; constructing a mutual exclusion tendency hypothesis based on the trace, and screening a reasonable tendency by predicting and comparing multi-track deformation symbol distribution; and meanwhile, in combination with a local main pressure stress axis P orientation of field geological inversion, whether the maximum uplift area is located on a P-axis pointing side is judged so as to constrain the sliding type. According to the method, a fault model does not need to be preset, high-confidence-coefficient judgment of the tendency and the mechanism is achieved through the physical self-consistency of the multi-view InSAR and the actually-measured stress field, the problem of geometric multiplicity of solutions of the fault under the condition of no surface fracture is effectively solved, seismic structure interpretation reliability is remarkably improved, and key parameter support is provided for seismic risk assessment.

This application discloses a method and system for inverting and analyzing borehole fracture stress fields based on the right dihedral method, relating to the fields of geophysics and geological engineering technology. The method includes: batch loading fault data through a GUI interface and converting it to NED direction cosines; using the right dihedral method to divide the fault into compression and tension zones; using a coarse-fine two-stage grid search to determine the optimal principal stress direction and matching rate; searching for the minimum principal stress direction in the vertical plane and calculating the dual stress axis matching rate; finally, outputting the three principal stress directions based on the comprehensive matching probability and generating a stereographic projection map. This application improves data input efficiency through batch loading via a GUI interface; the two-stage grid search algorithm eliminates human error and improves the calculation accuracy of the optimal principal stress direction and matching rate; multiple statistical indicators provide quantitative evaluation, improving the reliability of the inversion results; and the GUI interface's visualization of the inversion results enhances engineering applicability and interactive efficiency.