不同微震震源机制下地下硐室围岩响应及支护建议

Hazard Control in Tunnelling and Underground Engineering

2019, Vol. 1

Issue (3): 68-76 DOI:

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Response and support suggestions of surrounding rock of underground cavern under different microseismic source mechanism

DONG Longjun, WANG Junhui, MA Ju

School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China

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Abstract With the development of railway, water conservancy, mining and other projects, increasing caverns need to be excuvated in the deep. Dynaimic loads includying blasting excavation and fault-ship burst seriavsly affect the stability of surrounding rockmass of undergroud cavern. The finite difference software FLAC3D was used to simulate the surrounding rockmass stability of underground cavern under blasting and fault-slip burst conditions. The peak ground velocity(PGV)was used, and the mathematical relationship of the surrounding rock PGV under different focal mechanisms was obtained by fitting the Sadovs formula and the McGarrs formula. It was concluded that under the blasting load condition, the distance between the underground cavern and the source had a significant influence on the stability of the cavern. The Sadovs deformation formula could well characterize the PGV of the surrounding rockmass response, but the McGarrs deformation formula was not applicable. Under the condition of fault-slip, the Sadovs deformation formula and the McGarrs deformation formula did not have high goodness of fit, the slip angle had a greater influence on the stability of the cavern. Based on the above analysis, it was recommended that deep underground cavern support should consider the influence of the source, such as PGV. For the source of fault-slip, the influence of the slip angle on PGV should be considered. The above conclusions provide data support and technical basis for the excavation and support of geotechnical engineering underground cavern.

Key words： underground cavern blast fault-slip PGV support

Received: 25 December 2018 Published: 13 November 2019

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DONG Longjun,WANG Junhui,MA Ju. Response and support suggestions of surrounding rock of underground cavern under different microseismic source mechanism[J]. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(3): 68-76.

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http://tunnel.sdujournals.com/EN/ OR http://tunnel.sdujournals.com/EN/Y2019/V1/I3/68

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