地下室主体结构为支点的深基坑局部内支撑支护方案的分析与监测

Analysis and Monitoring of Local Internal Supporting Scheme for Deep Foundation Pit with Basement Main Structure as Support Point

根据某临近营运地铁站点深基坑的特点和周边环境,对整体的基坑支护方案优选,确定其他部位桩锚支护,先行进行地下室主体施工,然后,临近地铁一侧采用以地下室主体结构为支点的局部内支撑支护方案。对此方案进行了三维有限元分析,施工时充分监测。支撑内力分析结果与监测结果进行了对比,两者的趋势相同,数值吻合良好。在施工监测中,边坡位移控制较好,在深基坑施工期间地铁营运正常,说明局部内支撑方案是安全可靠的。

According to the characteristics of the deep foundation pit near the operating subway station and the surrounding environment,the overall foundation pit support scheme was optimized,and the pile-anchor support in other parts was determined.The main body of the basement was constructed first,and then the local internal support scheme with the main structure of the basement as the fulcrum was adopted on the side of the adjacent subway. Three-dimensional finite element analysis was carried out for the scheme, and a lot of monitoring was carried out during construction. The results of internal force analysis and monitoring are compared,and the trend between them is the same,and the numerical value is in good agreement. In the construction monitoring,the slope displacement is well controlled and the metro operation is normal during the construction of deep foundation pit,which shows that the local internal support scheme is safe and reliable.