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Excavation optimization based on unloading and span-cut mechanism for large-span tunnel

WANG Song-zhou,FU He-lin,CAO Qi,LIU Yun-si(School of Civil Engineering,Central South University,Changsha 410075,China)  
It is a difficult technical problem to excavate the Xiangjiang River tunnel located at Yinpan Road,Changsha,since it contains a single hole area of 380 m2 and a maximum span of 23 m.This paper,aimed at solving this problem,proposed an excavation division partition based on reducing span and unloading mechanism.That is,by reducing the excavation span,to achieve load transfer in steps.In this way,excavation disturbed zone would appear in moving rock,which could reduce the single load of tunnel structure,radically improve the force structure at last and ensure of the safty and stability of tunnel construct.Numerical simulation by finite element was analyzed to demonstrat the rationality of optimization for the excavation.
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