Test device and test method for simulating excavation and unloading under deep three-dimensional loading condition

Abstract

The invention discloses a test device and a test method for simulating excavation and unloading under the deep three-dimensional loading condition. The device comprises a true triaxial test bench, a rock test sample, a loading chamber, a connecting column, a left round hole, a right round hole, a front bearing plate, a back bearing plate, a cushion block, a bolt, a pedestal, a rectangular frame, avertical linear guide rail, a vertical sliding block, a horizontal linear guide rail, a horizontal sliding block, a left cross beam, a right cross beam, a screw rod nut, a lifting screw rod, a bearing, a straight rack, a gear, a steering gear vertical output shaft, a motor, a steering gear, a sealing shell, a gas inlet, a steering gear horizontal output shaft, a cutting drill bit, a spiral bladeand a hole channel. The test method is implemented according to the following steps: 1, fixing the device and performing three-dimensional loading; 2, mounting and adjusting the position of the cutting drill bit; 3, simulating round tunnel excavation, unloading and drilling; and 4, developing subsequent research. The adaptability is high and the process of simulating the excavation and unloading process through three-dimensional loading is realized.

Description

technical field [0001] The invention belongs to the field of rock mechanics test equipment, and relates to a drilling test device and a test method for simulating excavation and unloading of circular tunnels under three-dimensional deep loading conditions. Background technique [0002] Tunnel is one of the most important structural forms of underground rock engineering. Affected by engineering excavation, high stress concentration areas will be formed on both sides of the tunnel. When the concentrated stress reaches or exceeds the strength of the rock mass, the rock mass will undergo static stress. Or dynamic damage, such as large deformation of tunnels, zonal damage, slab cracking damage, and rockburst. Static failure of rock mass will affect the long-term stability of tunnel engineering structure, while dynamic failure often causes a large number of casualties, equipment damage, delay of construction period and major economic losses, which seriously threatens the safe cons...

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Problems solved by technology

[0010] In order to achieve the above object, the present invention provides a test device and test method for simulating excavation and unloading under the condition of deep three-dimensional loading. The problem of large differences in stress paths between loading and actual tunnel excavation unloading

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