临近既有建筑软土基坑支护方法研究——以福州某城市广场基坑工程为例

Study on supporting method of soft soil foundation pit adjacent to existing buildings

基于地下空间开发背景,通过对基坑支护中放坡、重力式水泥土墙、土钉墙、支挡式结构、复合支护方法进行对比和适用性分析,提出软土地块应采用水泥土搅拌桩、H型钢桩、预应力锚杆组合的复合支护方案。最后,通过案例分析了临近民房软土地块基坑的支护结构设计、支护施工顺序和支护施工要求,并通过现场施工监测数据,验证基坑支护的施工安全。

Based on the background of underground space development,through the comparison and applicability analysis of slope,gravity cement wall,soil nailing wall,retaining structure and composite support methods in foundation pit support,this paper puts forward that the composite support scheme of cement soil mixing pile,H-shaped steel pile and prestressed anchor bolt should be adopted in soft soil plot.Finally,through a case,this paper expounds the support structure design,support construction sequence and support construction requirements of the foundation pit in the soft soil plot near the civil house,and verifies the construction safety of the foundation pit support through the on-site construction monitoring data.