摘要
考虑浅埋软岩隧道随掌子面推进距离及围岩弹塑性、流变特性引起的拱顶下沉,再加上掌子面开挖前的拱顶下沉量,推算出拱顶下沉函数的经验计算公式。利用非线性最小二乘拟合对现场数据进行计算,得到拱顶下沉预测总量,依据规范得出浅埋软岩隧道二衬的合理支护时间。
In combining with the vault crown settlement in shallow buried and soft rock tunnel caused by the property of elasto-plastic and rheology of tunnel surrounding rocks,and distance between excavated face and monitoring section,and the amount of subsidence in the front of excavated face,we calculate the empirical formula of vault crown settlement.In order to deduce the other variable of the formula,the fitting method of nonlinear least square is adopted in data processing.The total amount of subsidence can be calculated when time and distance tend to be infinity in the formula.We can suggest the criterion for second lining construction in time in shallow buried and soft rock tunnel on the basis of code for design of road tunnel.
出处
《公路工程》
北大核心
2013年第5期44-46,71,共4页
Highway Engineering
基金
国家自然科学基金项目资助(41174061)
中南大学自由探索计划资助(2011QNZT011)
关键词
浅埋软岩隧道
拱顶下沉
流变
前期沉降
二衬支护时机
shallow buried and soft rock tunnel
vault crown settlement
rheological properties
subsidence in the front of excavated face
second lining construction in time
