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《Rock and Soil Mechanics》 2008-11
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Research on crustal stress measurement and inversion of stress disturbed area of a tunnel

BAI Shi-wei1, HAN Chang-rui1, GU Yi-lei2, WANG Gui-bin1, LI dan1 (1. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. China Education Ministry’s Key Lab. for the Exploitation of Southwest Resources and the Environmental Disaster Control Engineering, Chongqing University, Chongqing 400030, China)  
Through investigation and in-situ measurement of crustal stress in tunnel location, rather large tectonic stress is ascertained in the tunnel region at first. Because of core sample break, only stress of disturbed area is measured in the tunnel. In the process of 3-dimension numerical modeling, the course of vertical erosion by the Wujiang River is modeled in order to reflect the effect of topographic form on crustal stress. And using the method of pilot calculation to adjust coefficient of horizontal pressure, then appropriate initial stress is determined. Making calculated results coincide with the data measured in-situ, the rational coefficient and crustal stress is obtained. Numerical calculation covers the shortage of in-situ measurement. The research results show that crustal stress of tunnel axis varies with embedded depth and topographic features; and the section K42 is of very high stress. The results provide a scientific foundation for analyzing excavation, support and stability of tunnel.
【Fund】: 国家自然科学基金重点项目(No.50334060)资助
【CateGory Index】: U452.11
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