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| Analysis of the Stress Characteristics and Rock Burst of Ultra Deep Buried Tunnel in Sichuan - Tibet Railway |
| WANG Dong1，LIN Tisin - bin1，JIANG Liang - wen2，LIN Zhi - heng2，FENG Tao2 |
| (1. Chengdu University of Technology，Chengdu，Sichuan 610059，China; 2. Geological Innovation Studio of CREEC， Chengdu，Sichuan 610031，China) |
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Abstract Abstract ： Research purposes ： Ultra deep buried tunnel of Zheduoslian is the controlling key porject of Chengdu to Kangding Railway，which is located in the western section of Chinese famous 11 Y" shaped tectonic wedge position. The characteristics of ground stress and rock burst analysis are of great significance for railway route selection， design and construction. In this paper，the Sichuan - Tibet Railway Chengdu to Kangding control engineering of Zheduoshan tunnel as an example，through the data of ground stress test and numerical simulation to analyze the stress distribution characteristics of Zheduoshan tunnel area，and achieve the direction of the maximum principal stress. And through the tunnel rock stress - strain curve under uniaxial loading - unloading to calculate the tendency index of tunnel rock burst， analysis the rock mechanics index of rock burst. Finally，through the deep - hole drilling results，rock mechanics test， numerical simulation analysis and hydrological experiment to analyze Zheduoshan tunnel stress and the rock burst strength. Research conclusions:(1) The maximum principal stress of Zheduoshan tunnel is horizontal stress and the direction is NEE，the measured maximum value is 17 MPa，the maximum numerical simulation * value is 48 MPa; (2 ) From the analysis of rock burst tendency index test， the surrounding rock has the energy storage and release conditions of the medium to intense rock burst. ( 3 ) Through comprehensive analysis, the medium to intense rock burst of Zhuoduoslian tunnel J possible to occur. (4 ) The research results can provicie a basis for the design of thie tunnel, and also provide reference for the stability of surrounding rock.
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Received: 27 February 2017
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2017, Vol. 34 
