富水软弱深基坑开挖支护数值模拟及变形监测对比研究

Comparative Study on Numerical Simulation and Deformation Monitoring of Deep Foundation Pit Excavation and Support Under Rich Water and Soft Ground Condition

以某深基坑工程为例,结合数值模拟及现场监测,对富水软弱地层条件下深基坑开挖支护结构选取及参数优化进行研究。得到如下结论:地下连续墙+内支撑支护结构体系适宜富水软弱地层深基坑支护;围护墙变形及地表沉降主要受内支撑道数影响;现场监测数据表明该工况下数值模拟结果较实际值偏小。

Taking a deep foundation pit project as an example,combined with numerical simulation and on-site monitoring,the selection and parameter optimization of the excavation support structure for deep foundation pits under the condition of rich water and weak strata were studied.The following conclusions are obtained:the slurry wall+internal support structure system is suitable for deep foundation pit support in water rich soft stratum;the deformation of the retaining wall and surface settlement are mainly affected by the number of internal support channels;the on-site monitoring data shows that the numerical simulation results under this working condition are smaller than the actual values.