多种支护形式在超大型深基坑工程中的应用

摘要

杭州市市民中心S2地下车库工程基坑采用多种围护形式相结合的施工方案,包括咬合桩、预应力锚杆、高压旋喷桩、复合土钉墙、混凝土内支撑.通过合理安排支护施工、降水、土方开挖等工序,并结合基坑监测,经济合理地完成了超大型基坑的支护和土方开挖,保证了基坑和周边建筑物的安全.%Multiple supporting and protection forms, including secant pile, prestressed anchor bar, high-pressure rotary jet grouting pile, compound soil nail wall and internal concrete support, are adopted during construction of the foundation pit of Citizen Center S2 underground garage engineering in Hangzhou. Retaining, protection and earth excavation construction of super-large foundation pit are economically and reasonably completed and the safety of foundation pit and surrounding buildings is ensured through reasonable arrangement of construction sequence, such as retaining and protection, water lowering and earth excavation, etc., together with monitoring on the foundation pit.