大断面矩形顶管下穿合流污水箱涵变形分析

Deformation Analyses of Large Section Rectangular Pipe Jacking Crossing Underneath Combined Sewage Culvert

大断面顶管施工对周围环境的影响有明显的尺寸效应。当顶管下穿越保护性污水箱涵时,研究总结污水箱涵本体变形及周围土体变形等规律可用于指导调整施工参数,具有重要意义。根据工程实例,分析了在巨型截面顶管下穿越合流污水箱涵过程中箱涵本体竖向位移、箱涵接缝三向位移、周围土体竖向位移、周围土体孔压等数据规律。基于数据反馈采取了多项施工控制技术,克服了施工控制工序难度大、穿越距离小、风险大等困难,积累了宝贵的区域经验。

Surrounding influence caused by the construction for large section pipe jacking has obvious size effect.When pipe jacking crossing underneath sewage culvert,it is of vital importance to analyze the deformation of sewage culvert and surrounding soil,and provide the guiding suggestion for construction.In the process of large section pipe jacking crossing underneath the combined sewage box culvert,the basic law of vertical and triaxial displacement of sewage culvert,vertical displacement and pore pressure of soil in deep stratum were analyzed.Based on data information,construction measures were adopted to overcome the difficulties of difficult construction controlling procedures,small crossing space,high risks etc.The conclusion provide valuable regional experience for future.