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《Sichuan Building Science》 2008-02
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Finite element analysis on the influence of advanced excavation distance to tunnel stability of large-span tunnel with small interval

SHI Xiaoshuang,ZENG Xiangguo,ZHAO Shiping,LIU Yongjie,WANG Qingyuan(College of Architecture and Environment,Sichuan University,Chengdu 610065,China)  
The coupling effect of two roadways is very important in small interval tunnel excavation,and it is related to the grade of surrounding rocks,span and interval of the tunnels,methods of excavation and supporting.With the engineering background of Huatugang tunnel in Chongqing,the FE software ANSYS is adopted to simulate the excavation of tunnel,and the influences of excavation to the ground surface settlement,deformation and stress of the surrounding rocks under ten,thirty and fifty advanced excavation distance are studied respectively.The results show that increase of advanced excavation distance is advantage to the stability of surrounding rocks,and it is feasible for this tunnel to be excavated by thirty advanced excavation distance,and the key positions of measurement during excavation are proposed.The analysis method and conclusion in this paper may provide some references for the design and construction of small interval tunnels.
【Fund】: 教育部科学技术研究重大项目(305013);; 四川大学“985”科技创新平台引进人才项目
【CateGory Index】: U451
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