浅层顶管施工引起的土体移动  

Ground movements induced by pipe jacking in shallow underground soils

作　　者：方从启[1] 孙钧[2] 

机构地区：[1]上海交通大学土木建筑工程系,上海200030 [2]同济大学地下建筑与工程系,上海200092

出　　处：《岩土力学》2000年第1期5-9,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金重点资助项目! (No .597381 60 );上海交通大学基金

摘　　要：顶管施工引起包括地面沉降和土的轴向移动在内的土的运动。土的这些运动可能导致邻近构筑物和管线的损坏。理论分析和现场实测都显示 ,在类似于上海等地的软土地层中顶管施工 ,顶管周围土的运动问题是三维的。基于半解析数值方法的基本原理 ,将轴向离散而在径向和环向选取位移函数 ,构造了解析解函数。给出了包括位移函数、刚度矩阵和荷载矩阵在内的理论分析过程 ,从而建立了半解析单元法。利用半解析单元法将顶管施工中三维土运动问题转化成一维数值计算。利用所建立的半解析单元法 ,就软土地层中顶管工程实例计算了施工所引起的土体位移。结果表明 ,半解析元法用于计算顶管施工中顶管周围土的移动 ,可以得到较为满意的结果。由于计算所需要的单元数减少 ,处理该问题所需要的时间也明显减少。Pipe jacking in soft soils may induce ground movements, including ground settlement and axial movement of soils below the ground surface. These movements can lead to damages of nearby structures and utilities. Both theoretical analyses and field observations have shown that pipe jacking in such a kind of soft soil ground as in Shanghai area, movements of soils around the pipes is of three dimension. Based on the basic principle of semi analytical method, a procedure for the computation of soil movements is developed which discretize axial direction while adopting displacement functions in radial and circular directions.Regular functions are set up and semi analytical element method is constituted. Displacement functions, stiffness matrices and load matrices are presented in details. By making use of the semi analytical element method, the three dimensional soil movements problem of pipe jacking is transfered to a one dimensional numerical calculation. The value of a calculated case of pipe jacking in soft soils is compared to that of observations. The results show that semi analytical element method is a satisfied way to predict soil displacements induced by pipe jacking in shallow soft soils. Due to the sharp reduction of the number of the element, the time needed for processing this problem is much less. Some useful conclusions have been obtained according to the analyses and calculations.

关 键 词：顶管 半解析元法 土体移动 

分 类 号：TU435[建筑科学—岩土工程]