Underground engineering disturbance similarity model test bench and test method

Abstract

The invention discloses an underground engineering disturbance similarity model test bench and a test method. The underground engineering disturbance similarity model test bench comprises a model box.The model box comprises an inner frame, a middle frame and an outer frame, the inner frame is sleeved in the middle frame, and the middle frame is sleeved in the outer frame. Multiple hydraulic loading devices are arranged at the inner top of the inner frame. Multiple horizontal first linear sliding rails are arranged at the inner bottom of the inner frame, and the tops of the first linear sliding rails are connected in a sliding manner with first sliding blocks. A sample box is arranged at the tops of the first sliding blocks. Protection springs are fixedly arranged between the first slidingblocks and the sample box. A buffer protection layer is further arranged between the inner bottom of the inner frame and the sample box. Wave absorbing layers are arranged on the side and at the bottom of the sample box. Multiple vertical second linear sliding rails are arranged on the inner side of the middle frame. Second sliding blocks are arranged on the outer side of the inner frame and connected with the second linear sliding rails in a sliding mode. A first actuator and a plurality of supporting springs are arranged at the inner bottom of the middle frame, and the top of the first actuator and the tops of the supporting springs are connected with the outer bottom of the inner frame.

Description

technical field [0001] The disclosure belongs to the field of underground engineering tests, and in particular relates to an underground engineering disturbance similar model test bed and a test method. Background technique [0002] Dynamic pressure roadway (tunnel) is the roadway (tunnel) affected by excavation disturbance pressure. Mine mining or nearby engineering excavation has a great impact on the disturbance of surrounding roadways (tunnels), which will increase the deformation of roadways (tunnels) or accelerate the deformation and destruction of roadways (tunnels). This disturbance can be analyzed through field tests, but The cost of testing is high, the error is large, and single factor variables cannot be controlled, which is not conducive to carrying out theoretical research or summarizing laws. The physical model test based on the similarity theory can invert the actual project, obtain the constitutive relationship of the test body in the model, and invert it i...

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Problems solved by technology

[0003] The excavation disturbance is generally transmitted to the surrounding rock of the roadway in two directions (horizontal and vertical), similar to the p-wave and s-wave in the seismic body wave. The current test equipment cannot well simulate the impact of the excavation disturbance on the exit roadway (tunnel) , or the gravity effect of the overlying strata cannot be well considered, that is, the effect of buried depth cannot be simulated

The dynamic pressure roadway support physical model test device proposed in patent CN201511021371.9 can only simulate longitudinal disturbance, and the single actuator at the bottom has limited carrying capacity, which cannot support a model with a large mass, resulting in a small similar model and cannot truly invert mining disturbance In addition, directly setting the actuator on the top of the model will cause the simulated overlying rock load to form a periodic change, which cannot truly express the natural stable load of the overlying rock layer, and the simulation of the buried depth is not ideal

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