深大基坑桩锚支护监测与数值分析

Monitoring and Numerical Analysis of Pile-anchor Supporting Structure in Deep and Large Foundation Pit

对解放军总医院27.4 m深大基坑桩锚支护结构水平位移、桩体深层水平位移、竖向位移、锚杆轴力及周边道路沉降等监测数据与数值计算结果进行对比分析,结果表明,基坑支护结构水平位移、桩体深层水平位移、竖向位移变形较小,均远小于规范规定的预警值;各道锚杆相互协调,但锚杆轴力存在一定的预应力损失;周边道路沉降最大为4.8 mm,远小于基坑预警值。分析表明该基坑选取的支护结构设计合理,基坑开挖过程中支护结构的监测值与数值计算数据结果吻合较好,可为类似工程提供参考。

Comparative analysis of monitoring data and numerical calculation results is carried out based on a 27.4 m deep foundation pit pile-anchor supporting structure in Chinese PLA General Hospital.The results show that the horizontal displacement,the vertical displacement and deep horizontal displacement deformation of foundation pit support structure are small,which are far less than the prewarning value specified in the code.All anchors are coordinated with each other,but the anchor bolt is far less than the pre-warning value.The maximum settlement of the surrounding road is 4.8 mm,which is far less than the early warning value of the foundation pit.The analysis shows that the design of the supporting structure selected for the foundation pit is reasonable,and the monitoring value of the supporting structure during the excavation process is in good agreement with the numerical calculation data,which can provide reference for similar projects.