基于拱顶沉降控制的卵砾石地层浅埋隧道施工优化  

Construction optimization of shallow-buried tunnel in gravel strata based on controlling settlement of the crown

作　　者：喻军[1,2] 刘松玉[3] 龚晓南[2] 

机构地区：[1]浙江工业大学建筑工程学院,杭州310014 [2]浙江大学建筑工程学院,杭州310029 [3]东南大学交通学院,南京210096

出　　处：《中国工程科学》2013年第10期97-102,共6页Strategic Study of CAE

基　　金：浙江省科技厅资助项目(2012C21074);浙江省交通厅资助项目(2012H66);浙江工业大学自然科学基金项目(2011XY024)

摘　　要：某卵砾石地层浅埋公路隧道施工开挖,围岩的稳定性与拱顶沉降存在密切的关系,因此采用仿真分析法以拱顶沉降为控制目标,确保围岩的稳定,分析不同的施工方案得到拱顶沉降规律,达到优化施工的目的;同时,分析了不同的开挖路径和台阶长度,提出了一种最佳的施工方案。结果表明:在浅埋隧道开挖时容易引起拱顶沉降,并且随着施工方案的不同,拱顶沉降有较大的差异。在几种施工方法中,发现CRD法(交叉中隔墙法)比较适合,原因是拱顶沉降最小,应力释放较慢,在渐近的过程中有效地实现了应力的转移,较台阶法和CD法(中隔墙法)有大的优势,并与现场监测进行了对比分析,结果较为吻合。得到的结论可为类似工程提供参考。The stability of surrounding rock is closely connected with the settlement of the crown during construction of shallow-buried road tunnel in gravel strata. Therefore, simulation analysis of different construc-tion methods was used to get the settlement law of the crown to optimize the project as a goal controlling settle-ment of the crown and stability of surrounding rock. At the same time, the better method of construction was put forward to analyze different excavation path and stage length. The result showed that the crown settlement easily took place during excavation of shallow tunnel and with different construction methods, the difference of crown settlement was great. It is found that CRD method is the most appropriate for gravel strata tunnel because the crown settlement is lest and the stress releasing is slow and gradual and the stress transfer is more effective than CD method. Compared with site monitoring, the result is more identical. The conclusion can provide the reference for similar engineering.

关 键 词：卵砾石 隧道围岩 数值分析 施工优化 拱顶沉降 现场监测 

分 类 号：TU461[建筑科学—结构工程]