摘要
深圳地铁2号线世界之窗站站南并线段隧道下穿世界之窗景区办公楼,隧道埋深浅、跨度大,所处地质条件差,为Ⅵ级围岩。隧道建设过程中,初期支护出现变形破坏,沿拱架节点处产生通长纵向裂缝,地表建筑沉降大且多处出现裂缝。通过现场观察和对监控量测数据的分析,从围岩的岩性条件、地下水条件、隧道设计参数及施工等方面,探讨了该隧道初期支护大变形的原因及机制,认为它是地表建筑附加荷载、围岩软化和大范围塑性流动综合作用的结果。并基于加固围岩、控制变形、提高支护刚度和改进施工的整治原则,提出了相应的加固及整治措施。实践证明,对大变形段的整治取得了成功,并有效地指导了后续施工,确保了隧道安全顺利贯通。
The double-route tunnel of Shijiezhichuang Station of Shenzhen Subway Line 2, which goes through the surface office building, has a large span with shallow coverage and the geological conditions are very bad. The large deformation and longitudinal cracks occurred on the primary retaining structure during the construction, and the foundation subsidence of the building was large, the multiple cracks also appeared. Through the field observation and the analysis on the data obtained from the monitoring and surveying, the reasons and mechanism of the large deformation of the tunnel are discussed from the conditions of the surrounding rocks, groundwater, design parameters and construction factors. It is the additional loads of the building, the softening and the wide range of plastic flow of surrounding rocks that cause the large deformation jointly. Based on the reinforcement of the surrounding rock, the deformation controlling, the improvement of retaining stiffness and the construction method, the corresponding reinforcement and controlling measures are put forward. The results show that the repair program is successful and the construction of the metro tunnel is finished safely.
出处
《工程勘察》
CSCD
北大核心
2010年第10期9-13,共5页
Geotechnical Investigation & Surveying
关键词
地铁隧道
初期支护
大变形
整治措施
metro tunnel
primary retaining structure
large deformation
remediation measure
