某软土地层深基坑围护结构变形估算方法研究

Research on Estimation Method of the Deformation of Deep Foundation Excavation in Soft Soil Stratum

在已有研究成果和大量实测数据的基础上,对宁波软土地区深基坑围护结构变形估算方法进行研究。根据宁波地区深基坑实际施工经验和大量深基坑工程监测数据的统计分析,给出了宁波软土地区围护结构横向变形的高斯函数表达式及各计算参数的取值范围。以宁波地铁2号线机场站深基坑为例,通过分别开挖至7.5,11,14,16.5m时的计算数据与实测数据对比分析,验证了围护结构高斯函数变形表达式的有效性和实用性。结果表明,计算结果与实测结果数据拟合良好,拟合精度随开挖深度的增加而增高。

Based on the existing research and a large number of measured data, the method on estimating the deformation of retaining structures of deep foundation excavation in soft stratum in Ningbo is conducted. On the basis of actual construction experience and statistical analysis of the engineering monitoring data, the Gaussian function on lateral deformation of retaining structures in the soft soil stratum and the calculation of parameter values are given. Taking the airport station of metro line No. 2 in Ningbo for example, by comparing and analyzing the calculated data with experimental data when excavating to 7.5,11,14, 16.5m, the Gaussian function on lateral deformation of retaining structures is provided available and useful. The results show that the calculation curve fits well with the test result and the fitting precision increased gradually with the increase of excavation depth.