软土地区大断面矩形顶管浅覆土下穿高速变形控制分析研究

以上海市陆翔路—祁连山路贯通工程大断面矩形顶管下穿S20外环高速为背景,探讨了控制顶管浅覆土下穿高速变形的加固措施.介绍了钢管幕加固在本工程中的设计与工程实施情况,并采用三维数值仿真分析了下穿S20外环高速施工引起的变形情况,预测变形规律及结果与监测断面数据吻合性较好.工程的实施论证了采用钢管幕加固控制大断面顶管浅覆土...

Settlement Control Investigation on Large Quasi-Rectangular Pipe Jacking Tunnelling under Expressway with Shallow Overburden in Soft Soil Areas

Based on the connecting project of Luxiang Road-Qilianshan Road in Shanghai, settlement control measures of large quasi-rectangular pipe jacking tunnelling under S20 expressway with shallow overburden is discussed. Design and engineering application of steel pipe roof is introduced. The deformation caused by high-speed construction under the outer ring of S20 is analyzed by using three-dimensional numerical simulation. The numerical prediction of S20 expressway settlement coincides with the in-situ measured data. Successful application of this project confirms the feasibility of steel pipe roof to attenuate the unfavorable effect caused by large Quasi-Rectangular Pipe Jacking. Thus high referential value will be offered for future engineering projects undercrossing expressway in soft soil areas.