Abstract：Research purposes：Tongzhai tunnel entrance was affected by the same high stress,and other geological factors carbonaceous slate role in the early stages to 118 steel support parameters based support,the construction of large deformation occurs,arch distortion,shotcrete off,seriously affecting construction safety and progress.This paper is finding solutions to large deformation method to provide a reference for the subsequent construction.
Research conclusions：(1)In the stress deformation by the engineering test,take the anti-supporting measures,adhere to the”strong first and optimization late”principle,support in place at a time,so as to control the deformation.(2)Soft surrounding rock after excavation is timely supported,enclosing to ring as soon as possible,and timely radial grouting to effectively strengthen loose rock,improve the surrounding rock properties,reduce rock pressure effected on the supporting structure,the support and surrounding rock stress system has formed,to restrain the deformation of tunnel.(3)Reduce the times of the excavation,set the inverted arch as early as possible,control the initial support closing time strictly.(4)The control measures of deformation of tunnel carbonaceous slate can provide reference for similar engineering.
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2014, Vol. 31 
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