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Test system for simulating transient unloading of excavation of chamber face under different geostress conditions

A test system and transient unloading technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problem of unmeasurable displacement of surrounding rock.

Active Publication Date: 2019-06-25
TIANJIN UNIV
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Problems solved by technology

This test can indirectly solve the problem that the displacement of surrounding rock cannot be measured at the moment of unloading during excavation by drilling and blasting in actual engineering

Method used

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  • Test system for simulating transient unloading of excavation of chamber face under different geostress conditions
  • Test system for simulating transient unloading of excavation of chamber face under different geostress conditions
  • Test system for simulating transient unloading of excavation of chamber face under different geostress conditions

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0047] Such as figure 1 As shown, the test system for simulating the transient unloading of tunnel face excavation under different ground stress conditions in the present invention mainly includes three parts: the in-situ stress simulation device II, the transient unloading device III and the surrounding rock full field Displacement monitoring device Ⅰ; in this test system, the surrounding rock model 2 of the chamber clamps its four loading surfaces (a, b, c, d) by the ground stress loading device 1 in the in-situ stress simulation device Ⅱ and applies load, so the surrounding rock model 2 of the chamber is subjected to plane stress. Among them, the hole in the chamber surrounding rock model 2 is filled by the plug body 3 in the transient unloading device III, and the ground stress is transmitted to the plug body 3 through the hole; after loadi...

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Abstract

The invention relates to a test system for simulating transient unloading of excavation of a chamber face under different geostress conditions. The test system is capable of simulating a transient unloading process of excavation of the diverticulum face to complete transient unloading of surrounding rocks with different excavation surface shapes under different geostress conditions and different unloading rates, and can record the whole process of the overall displacement variation of the surrounding rocks of a chamber. The test system comprises an in-situ stress simulation device, a transientunloading device and a surrounding rock overall displacement monitoring device. The in-situ stress simulation device is composed of a ground stress loading device and a chamber surrounding rock model. Four loading surfaces in the chamber surrounding rock model directly contact four hydraulic heads of the ground stress loading device. The ground stress loading device and the chamber surrounding rock model are used together and placed on the same plane perpendicular to a horizontal plane. The transient unloading device and the surrounding rock overall displacement monitoring device are placed in the front and rear directions of the plane respectively. The test can indirectly solve the problem that the displacement of surrounding rocks cannot be measured at the moment of excavation and unloading of drilling and blasting in actual engineering.

Description

technical field [0001] The invention specifically relates to a transient unloading simulation test system for underground chamber excavation based on rock dynamics, and belongs to the field of geotechnical engineering model test devices. Background technique [0002] Restricted by topography and geomorphology, a large number of engineering buildings in my country are deeply buried in the underground surrounding rock. The surrounding rock has high ground stress and complex geological structure. The sudden unloading during the excavation process often induces large deformation and rheological deformation of the surrounding rock. Highly non-linear behaviors such as zoning and zoning rupture, which in turn lead to engineering geological disasters such as surrounding rock instability, collapse, cracking, and rockburst, which have brought severe challenges to the safety of the project. my country's deep engineering construction mainly adopts the drilling and blasting method, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
Inventor 徐颖夏开文王帅陈荣董鹏赵格立
Owner TIANJIN UNIV
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