软土地区长距离大断面矩形顶管平行施工影响机理研究

Study on Influence Mechanism of Long-distance Large-section Rectangular Pipe Jacking Parallel Construction in Soft Soil Area

以上海市陆翔路-祁连山路贯通工程445 m长距离大断面矩形顶管平行施工为背景,分析推导了大断面矩形顶管断面尺寸、极限覆土和平行顶管极限净距取值的计算公式。通过对地表变形、超孔隙水压力、顶管顶力及侧摩阻力实测数据的规律及发展分析,探讨了软土地区长距离大断面矩形顶管平行施工影响机理,为今后类似矩形顶管工程提供借鉴意义。

Based on the 445-m long-distance large-section rectangular pipe jacking parallel construction in Shanghai Luxiang Road-Qilianshan Road Link Project,the calculation formula of the section sizes,limited casingsoil and parallel pipe jacking limit clear distance value of large-section rectangular pipe jacking is analyzed and deduced.By analyzing the rules and development of the measured data of surface deformation,excess pore water pressure,pipe jacking force and side friction,the influence mechanism of long-distance large-section rectangular pipe jacking parallel construction in the soft soil area is discussed,which provides the reference for the similar rectangular pipe jacking projects in the future.