盾构隧道下穿国家4A级景区地表沉降影响分析

Settlement Analysis on Shield Tunnel Under Passing National AAAA Scenic Spots

在城市发展建设过程中,解决好隧道下穿地表既有构筑物的沉降问题,对城市轨道交通与市政道路的建设具有重大意义。本文在调研国内外盾构隧道下穿引起地表沉降控制标准的基础上,以苏州桐泾路北延工程项目盾构隧道下穿国家AAAA级景区山塘古街为背景,得出了本项目的变形及振动控制标准建议值。建立计算模型对盾构下穿施工引起的地表沉降进行计算分析,得到地表沉降数值,并得出地表各点沉降值随盾构近接距离的增加而减小且沉降能够满足相关要求的结论;对盾构施工前后及运营期间的振动影响进行分析,评估隧道建设施工时施工机械及挖掘土体引起的振动对山塘河及周边房屋的影响,以期进一步满足地表沉降的相关要求。

In the process of urban development and construction, it is of great significance for constructing urban rail transit and municipal roads to solve the settlement problem of existing structures under tunnels. On the basis of investigating the control standards of ground subsidence caused by shield tunnel under passing at home and abroad, taking the shield tunnel under passing Shantang Street in national AAAA scenic spot of the north extension project of Tongjing Road in Suzhou as an example, the recommended values of the deformation and vibration control standards of the project were obtained, and the calculation model was established to calculate and analyze the ground subsidence under this condition, and the value of ground subsidence was obtained. The results showed that the settlement value of each point on the ground decreased with the increase of the straight distance from the shield, and the settlement could meet the relevant requirements. The vibration influence analysis before and after shield construction and during operation was given. The influence of vibration caused by construction machinery and its excavation soil on Shantang River and its surrounding buildings was evaluated. It would be hoped that the relevant requirements of surface se社lement could be further satisfied.