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Study on the Reasonable Construction Method for a Loess Double-arch Highway Tunnel

ZHOU Sheng-guo 1 , HUANG Lun-hai 2 , JIANG Shu-ping 2 , LIU Xin-rong 3 (1.Department of Structure Engineering, Chongqing Jiaotong University,Chongqing 400074,China; 2.Chongqing Highway Institute of Communications Ministry. Chongqing 400067,China; 3. College of Civil Engineering,Chongqing University, Chongqing 400045,China)  
Based on the comprehensive testing system for structure and surrounding rockmass of highway tunnel(CTSSSRH),taking Nanguan Tunnel as an example,a test concerning the dynamic construction procedure of Double-arch tunnel of excavation is carried out through physical modeling.The results of Physical model testing show that the deformation of surrounding rockmass of tunnel varies with increase of the cave size.
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