Physical model apparatus and physical model apparatus method for simulating inclined rock stratums with different inclination angles

Abstract

The invention relates to a physical model apparatus and a physical model apparatus method for simulating inclined rock stratums with different inclination angles. The physical model apparatus comprises a reaction force system, a loading system, a preparation system and a compaction system, wherein the reaction force device is formed by connecting a six-sided reaction force frame through high-strength bolts and supplies reaction force to the loading system, the loading system loads on a model material by using a hydraulic jack to simulate ground stress, the preparation system is used for holding and preparing the inclined rock stratum of the whole test, and the compaction system uniform compacts each layer of the similar material in the preparation system by the hydraulic jack of the loading system. According to the present invention, with the apparatus and the method, the physical model test of the horizontal rock stratum can be performed, the physical model tests of the inclined rockstratums with different inclination angles can be met, the influence of the artificial material spreading and compacting on the test result can be reduced, the layered compaction preparation of the inclined rock stratum is achieved, the influence of the test position does not exist, the requirements of different sites can be met, and the apparatus and the method can be used for large-scale three-dimensional physical model tests.

Description

technical field [0001] The invention relates to a physical model test device and method for inclined rock formations, in particular to a physical model test device and method for inclined rock formations with different dip angles in underground engineering. Background technique [0002] With the rapid development of underground engineering construction, underground engineering continues to go deep, and the surrounding rock environment is becoming more and more complex. Under the action of in-situ stress and external forces, the underground rock formations form inclined distribution rock formations. In order to ensure the excavation and operation of engineering construction in inclined rock formations Safety, the study of physical and mechanical properties such as deformation and failure of rock formations and stress-displacement changes of surrounding rocks has become an important topic in the field of geological and rock formation research. However, due to the complex and c...

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Problems solved by technology

[0004] "Rock and Soil Mechanics" No. 7, 2009 introduced a physical model test for the stability of anisotropic rock mass tunnels with gently dipping angle bedding. The layered rock mass was generalized into a layered model, and the interlayer of the model was adopted The extremely soft film partition realizes delamination, but the method only realizes the bedding with a gentle dip angle, and the thickness of each rock layer cannot be guaranteed to be equal, and the loading method is the plane strain loading method

[0005] "Journal of Rock Mechanics and Engineering" No. 8, 2013 introduced a model test device for the influence of stick-slip dislocation of normal faults with a 75° dip angle on highway tunnels. Forced displacement is imposed on the bottom of the box to simulate the dislocation of faults and realize the tunnel in the fault. Force and deformation research under influence, but only a single fault can be simulated, and three-dimensional loading cannot be realized

[0006] "Journal of Coal Science" No. 7, 2013 introduced a simulation test of stratum movement in the mining of ultra-thick and steeply inclined coal seams. Inclined coal seams with different thicknesses were prepared, and the characteristics and characteristics of stratum deformation and failure during stratified mining of ultra-thick coal seams with an inclination angle of 50° were revealed. mechanism, but the experimental device did not carry out layered compaction of inclined coal seams, and did not realize true three-dimensional loading

[0007] "Rock and Soil Mechanics" No. 10, 2016 introduced a model test for the excavation of deep rock mass with multi-layer joints with different inclination angles. The material is inclinedly paved in the test bench, and the material is manually compacted layer by layer to realize the simulation of the jointed rock mass. It is difficult to precisely control the angle and direction of joints when tamping inclined materials, resulting in poor precision and large errors, resulting in a large difference between the shape of the model joint rock mass and the actual rock mass, which seriously affects the reliability of the model test results

[0008] "Journal of Geotechnical Engineering" No. 12, 2017 introduced a similar model test of the interaction relationship between layered surrounding rock and shield segment lining. In the test, the model surrounding rock was cut out 2.0 mm gap to simulate the bedding plane of the layered surrounding rock, and realize the analysis and research on the degeneration and failure of the surrounding rock behind the segment lining wall under different bedding angles, but the sawing joint surface cannot accurately control the direction and opening, and the experiment only Capable of plane strain loading

[0009] The invention patent with the application number 201510011652.X introduces a physical similarity simulation test device and method for inclined rock formations. The inclined angle of the entire model test frame is adjusted by hydraulic jacks to realize the preparation of inclined rock formations. However, the device is expensive and difficult to operate. Difficult to use in large physical model tests

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