Testing system and testing method of outburst-preventing bedrock buckling failure model of karst tunnel

Abstract

The invention discloses a testing system and a testing method of an outburst-preventing bedrock buckling failure model of a karst tunnel, which belong to the testing system and the testing method of a surrounding rock failure model under a hydraulic coupling action. The testing system of the outburst-preventing bedrock buckling failure model of the karst tunnel comprises a base, a round bearing frame, separated combination type uniformly-distributed loading devices, a bearing platform, an electro-hydraulic servo control actuator, an electro-hydraulic servo control box, a three-dimensional digital camera and three-dimensional sound emission devices; the separated combination type uniformly-distributed loading devices are utilized for loading a testing model in the horizontal direction and the vertical direction; the electro-hydraulic servo control actuator is utilized for simulating water pressure of the rear side of a bedrock; the three-dimensional digital camera and the three-dimensional sound emission devices are utilized for monitoring and locating three-dimensional deformation and three-dimensional sound emission information of the testing model during a testing process. According to the testing system and the testing method of the outburst-preventing bedrock buckling failure model of the karst tunnel, disclosed by the invention, an engineering environment of an outburst-preventing bedrock is accurately simulated, the testing efficiency is increased, the testing time and the economic cost are reduced, and the accuracy of a testing result is increased.

Description

technical field [0001] The invention relates to a surrounding rock failure model test system and a test method, in particular to a karst tunnel anti-outburst rock plate instability failure model test system and a test method. Background technique [0002] With the construction of large-scale underground projects in our country, water inrush disasters have brought huge safety hazards and economic losses to project construction, so the problem of water inrush in underground projects has been paid more and more attention. One of the common situations is that after the excavation of the underground space, the pressurized water behind the surrounding rock damages the surrounding rock and causes a water inrush disaster. The rock mass between the underground space and the confined water is equivalent to the anti-torture rock plate, and whether the anti-torture rock plate can maintain stability under the joint action of the in-situ stress state and the backside water pressure become...

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Problems solved by technology

[0003] The invention patent with the application number CN200810031466 and "Journal of Rock Mechanics and Engineering", Volume 28, Issue 7 "Development and Application of Similar Physical Model Test System for Pressure Water Inrush Mechanism in Deep Mining" introduced a seepage water inrush test on the roof of underwater mining method and device, but this device can only consider the joint effect of horizontal load and water pressure on the rock-like model alone in the case of fluid-solid coupling, and cannot apply vertical load to the test model

[0004] The invention patent with the application number CN201510018120 and the utility model patent with the application number CN201520026035 introduce a two-dimensional physical simulation test system and test method for water inrush disasters in deep buried tunnels. Visibility of the fracture evolution characteristics of the surrounding rock, but the test system can only load the model vertically but not the horizontal direction of the model

[0005] The invention patent with the application number CN201510179803 and the utility model patent with the application number CN201520229367 introduce a visual model test device and method for simulating tunnel water inrush. The patent studies different water pressure, different lithology, During the process of water inrush under different anti-torch rock mass thicknesses, the crack propagation of anti-torture rock mass and the formation of water inrush channels, but this patent and method cannot apply loads to rock-like materials, so it cannot simulate the stress environment in which natural rock mass is located

[0006] On the one hand, the above-mentioned existing patents focus on the formation of seepage channels in the seepage process and the water inrush process in surrounding rocks, but lack the structural characteristics of the outburst rock plate under the coupling action of in-situ stress and confined water. In the study of instability and failure, on the other hand, the existing patents cannot apply loads to the model or can only apply active loads in one direction to the model, which is inconsistent with the engineering reality that the surrounding rock is in a state of two-dimensional stress after excavation in underground engineering

In addition, the size of the model in the existing patent design is very large, the laying process of the test model is complicated, expensive, labor-intensive and time-consuming, the test efficiency is low, and the test monitoring technology is not accurate enough

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