Geostress Measurement for Deep-Buried Long Tunnel through Niba Mountain |
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| Authors: | DENG Lin DENG Rong-gui CHENG Qiang |
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| Institution: | 1. College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2. Highway Investigation and Design Institute of the Traffic Department of Sichuan Province, Chengdu 610016, China; |
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| Abstract: | In the geostress measurement for Niba Mountain on Ya＇an-Lugu Expressway, results of Kaiser effect tests combined with focal mechanism solution were compared with those obtained by hydraulic fracturing method, both of which are basically coincident. It is shown that the principal stress increases with burial depth ; the maximum principal stress is about 45 MPa, which is larger near fault zones because of stress concentration, and its direction ranges from N20°W to N75°W. |
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| Keywords: | Geostress Kaiser effect Focal mechanism solution Hydraulic fracturing method Deep buried tunnel |
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