软土地区地铁隧道施工期地表沉降规律研究

地铁隧道建设过程中主要通过地表沉降监测反映盾构施工的安全状态,Peck公式一直被认为是最简单实用的隧道施工期地表沉降计算方法,因此针对其适用性和参数取值问题是人们研究的重点。文中结合盾构施工的特点,探讨盾构施工中引起地层扰动的主要因素,通过在建地铁隧道的实测地表沉降数据分析Peck公式的适用性和参数取值问题,并探讨了几种特殊情况下的地表沉降规律,以指导施工方案的调整,减小施工的环境影响,同时保证隧道自身的施工质量。

Analysis of Surface Settlement Due to the Construction of a Shield Tunnel in Soft Clay

The environmental safety status is mostly reflected by the monitoring of surface settlement during the construction of Metro tunnel.Peck＇s equation has been always regarded as the most simple and practical calculation method of surface settlement during construction,and so its applicability and parameter sampling become the emphasis of research.Considering the characteristic of shield construction,the major factors of strata disturbance and rule of surface settlement in several especial conditions caused by shield construction are discussed,and the applicability and parameter sampling of Peck equation are analyzed by measured surface settlement in constructing Metro tunnel.The research can be used to direct the adjustment of construction project to lessen the environmental influence and ensure the quality of tunnel itself.