复杂边界条件下的某综合管廊深基坑支护选型

针对位于丘陵区的某综合管廊深基坑,综合考虑沿线紧邻的既有道路、桥梁、地铁和河道等多种复杂边界条件之后,分段采用“双侧喷锚”“双侧灌注桩+内支撑”和“单侧双排桩”三类支护。该基坑支护方案实施之后,有效限制了基坑变形,保障了周边重要建(构)筑物的安全运行,取得了良好的效果,可为丘陵区类似基坑工程提供借鉴。

Selection of Retaining and protecting for Deep Foundation Pit of Utility Tunnel under Complex Boundary Conditions

Considering the complex boundary conditions of the existing roads,bridges,subways and river channels along the line,three retaining and protecting methods of"two-side ejection anchor","two-side cast-in-place pile+internal bracing"and"one-side double-row pile"are used by sections for a deep foundation pit of utility tunnel in the hilly area.The implementation of the retaining and protecting scheme for this foundation pit can effectively restrict the deformation of foundation pit,ensure the safe operation of the surrounding important buildings(structures)and achieve the good effect,which can provide the reference for the similar foundation pit projects in the hilly area.