摘要
饱和软黄土工程性质差,施工风险高。文章以西安地铁5号线某矿山法隧道为工程背景,根据现场施工情况及监测数据,并结合多组有限元数值模拟,研究了大厚度饱和软黄土地层条件下矿山法隧道的主要施工技术措施及效果。结果表明:(1)饱和软黄土降水易疏干,降水后工程性质较好,因此降水是处理饱和软黄土的重要有效手段;(2)饱和软黄土地层降水引起的沉降较大,但非降水主要影响区为整体性、均匀性沉降,差异沉降较小;(3)对于紧邻重要建筑物的隧道,宜优先考虑降水措施或降水+注浆结合方案。必要时,采用隔离桩可有效保护邻近建筑物;非降水情况下,饱和软黄土地层的注浆效果差,需研究更具针对性的注浆工艺及浆液。
The tunnel project in saturated soft loess is characterized by unfavorable engineering behavior and high construction risk.Taking the mined tunnel of Xi’an metro line 5 as the background,the main construction technical measures and effects of the mined tunnel under large-thickness saturated soft loess stratum are studied based on the site construction process,monitoring data and several groups of finite element numerical simulation.The research result shows that:unwatering is easy to realize in the saturated soft loess and its engineering behaviors are good after dewatering,so dewatering is an important means to treat saturated soft loess;the settlement caused by dewatering in saturated soft loess layer is large while the settlement in the area beyond the dewatering affected area is mainly integral and uniform,and the differential subsidence is small;dewatering or a combination of dewatering and grouting should be given the priority as for the tunnel closely adjacent to the important building.Isolation pile can be adopted to effectively protect the adjacent building when it’s necessary;the grouting effect in saturated soft loess stratum is poor in condition of no dewatering,so more specific and appropriate grouting technology and grouts need to be studied.
作者
曹平
李冀伟
卢致强
刘建伟
CAO Ping;LI Jiwei;LU Zhiqiang;LIU Jianwei(Chengdu Architectural Design&Research Institute,Chengdu 610015)
出处
《现代隧道技术》
EI
CSCD
北大核心
2020年第6期177-185,共9页
Modern Tunnelling Technology
关键词
饱和软黄土
地铁隧道
邻近建筑
降水
注浆
沉降
Saturated soft loess
Metro tunnel
Adjacent buildings
Dewatering
Grouting
Settlement