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《Sichuan Building Science》 2009-03
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Analysis on mechanical characteristics of surrounding rock and support structures of lateral karst cave tunnel

MO Yangchun1,ZHOU Xiaojun1,DENG Yaolin2(1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;2.School of Seiences,Southwest Jiaotong University,Chengdu 610031,China)  
Because of the influence of karst cave,mechanical characteristics of surrounding rock and support structures of tunnel in karst zone differs from that of common tunnel.Taking a karst cave tunnel in the Zhongdian Expressway as an example,surrounding rock displacement and stress and plastic zone and anchor axial force and shotcrete axial force and moment are studied by using the three-dimensional fast lagrangian analysis of continua method,and the numerical calculation results and field monitoring results are compared.The results indicate that after tunnel is excavated,surrounding rock is convergented toward karst cave and tunnel.The surrounding rock between karst cave and tunnel is convergented in opposite direction.Plastic zone mainly concentrate on around tunnel and left-side and right-side of karst cave.The degree of stress concentration of the surrounding rock between tunnel and karst cave is higher.The anchor axial force and shotcrete axial force and moment of near karst cave are larger than that of away from karst cave.
【CateGory Index】: U451
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