中国铁道科学2011，Vol.32Issue(5)：78-82,5.
新建铁路隧道下穿既有铁路施工引起的地表沉降控制标准研究
Study on Ground Surface Settlement Control Standard Induced by Construction of New-Built Railway Tunnel Under-Passing Existing Railway
摘要
Abstract
Ground surface settlement occurs when the new-built railway tunnel under-passing the existing railway is constructed. At this time, the influence on the operation safety of the existing railway is mainly controlled by track irregularities. ANSYS 2-D FEM was adopted to establish the mathematical model for the engineering of new-built railway tunnel under-passing the existing railway. By which ground surface settlement was simulated under 96 conditions of different maximum equivalent stress, geological condition, buried depth and tunnel structure, etc. Regression analysis was carried out by Peck formula to obtain the width coefficient of settlement trough under 96 conditions. Based on the simulation and regression results, the relation between the width coefficient of settlement trough and the buried depth was derived. The relation was also put forward between the maximum ground settlement and the elastic modulus of strata, maximum equivalent stress and the buried depth. On this basis, according to the normal distribution law of ground settlement curves, the mathematical meaning of the width coefficient for settlement trough and the management value of track irregularities, the control standards for the ground settlement of the new-built railway tunnel under-passing the existing railway of different grades were derived.关键词
铁路隧道/下穿施工/地表沉降/控制标准/等效应力Key words
Railway tunnel/ Under-passing construction/ Ground surface settlement/ Control criterion/Equivalent stress分类
交通工程引用本文复制引用
朱正国,李兵兵,李文江,朱永全..新建铁路隧道下穿既有铁路施工引起的地表沉降控制标准研究[J].中国铁道科学,2011,32(5):78-82,5.基金项目
国家自然科学基金资助项目(50908153) （50908153）
铁道部科技研究开发计划项目(2008G024-B) （2008G024-B）
