深部高应力圆形隧洞内部卸荷条件下岩爆模拟试验和强度弱化效应研究

doi:10.13722/j.cnki.jrme.2020.0761

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Abstract To simulate the rockburst process of deep high stress circular tunnel sidewalls under internal unloading conditions，100 mm×100 mm×100 mm cube specimens from red sandstone with moderate rock burst tendency were prepared，and rockburst simulation tests under the condition of loading first and then drilling unloading were conducted using TRW–3000 rock true triaxial electro-hydraulic servo mutagenesis test system to simulate the two-dimensional stress state of 500 m depth. Firstly，the specimens were loaded to the set initial stress state，and then a self-developed drilling unloading test device(25 mm hole diameter) was used for rock internal unloading. Subsequently，the loading was applied in the vertical direction until the failure of the hole wall，and the active unloading was applied after the simulation effect was achieved. The rockburst process of the hole sidewall was monitored and recorded using a micro-camera during the tests. In order to compare the effect of unloading，rockburst simulation test was carried out on the same size red sandstone specimens with a prefabricated hole (25 mm hole diameter). The test results show that the rockburst process can be reproduced under these two test conditions. The whole test process can be divided into calm，particle ejection and rock fragment exfoliation stages. Finally，V-shaped notches were found on both sidewalls. Compared with the first drilling and then loading test，the initial failure stress of the hole sidewall in the loading first and then holing test is lower and the hole sidewall is more likely to be damaged. The test results indicate that the internal unloading of high stress rock will cause damage to the surrounding rock in a certain extent and range，and induce obvious strength-weakening effect to the surrounding rock.

Key words： rock mechanics deep rock strength-weakening high stress unloading circular tunnel rockburst

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	Articles by authors
	SI Xuefeng1
	GONG Fengqiang2

Cite this article:

SI Xuefeng1,GONG Fengqiang2. Rockburst simulation tests and strength-weakening effect of circular tunnels under deep high stresses and internal unloading conditions[J]. , 2021, 40(2): 276-289.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0761 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I2/276

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