深基坑支护技术及零嵌固深度受力体系研究

Deep Foundation Pit Supporting Technology and Zero Stress System Built in Depth Research

北京天坛医院迁建工程，基坑南北长330m，东西宽为200m，基坑开挖深度为6．50～14．70m，采用复合土钉墙（土钉墙＋预应力锚杆）、土钉墙与桩锚复合支护体系两种支护结构。结合北京天坛医院迁建工程，对复合土钉墙及护坡桩零嵌固深度受力体系在砂卵石地层中应用进行研究。

The relocation project, Beijing tiantan hospital foundation pit, north and south long 330m, 200m wide, excavation depth is 6.50 - 14.70m, with composite soil nailing wall （soil nailing wall ＋ prestressed anchor）, the composite soil nailing wall and pile anchor supporting system of two supporting structure. Combined with the relocation project, Beijing tiantan hospital of composite soil nailing wall and slope protection pile zero depth of build-in stress system applied in the sandy pebble stratum were studied.