摘要
隧道施工中,预留变形量的合理确定能较准确的预计开挖轮廓,既可确保围岩充分变形而减小围岩压力,又可避免侵限的情况发生,对于隧道的设计和施工有重要影响。本文对台阶法施工下隧道的预留变形量的主要影响因素进行了分析和探讨,并通过现场实测与数值模拟相结合,结果表明,台阶法开挖中下台阶开挖引起的变形是围岩总变形的重要组成部分,可以达到总变形量的50%左右。确定预留变形量时必须充分重视下台阶开挖引起的变形。此工作可为今后类似的工程的实施提供一定的借鉴与参考。
When tunnel is under construction,the excavation outline of the tunnel can be predicted exactly by the rational account of reserved deformation,which is also benefit to tunnel surrounding rock deformation and decrease of its stress.In this paper,the major influential factors of reserved deformation are discussed when tunnel is built with the bench method.According to the association method of in-situ measurement and numerical simulation,the rational account of reserved deformation is suggested,when tunnel is built with the bench method.The results show that the deformation caused by excavation of the lower bench is an important component of the total deformation in the surrounding rock,and can reach 50% of the total.For the reserved deformation,full attention must be paid to the deformation caused by excavation of the lower bench.The work presented here can be referred in similar projects.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第5期1077-1081,共5页
Chinese Journal of Underground Space and Engineering
关键词
预留变形量
台阶法
下台阶开挖
rational deformation
bench method
lower bench excavation
