富水深厚砂卵石地层深基坑降水引起的地层沉降预测

Prediction of Stratum Deformation Caused by Deep Foundation Pit Dewatering in Water-rich and Deep Sandy Pebble Stratum

以洛阳轨道交通车站深基坑降水为背景,利用降水施工实测数据对数值计算模型采用的边界条件进行修正,同时计算出敞开式条件下不同降水深度和不同含水层厚度的降水漏斗曲线,并进行数值拟合。将拟合函数引入土体压密计算公式,预测因降水引起的坑外地层沉降。通过实测数据对预测方法进行了验证,结果表明:预测结果与实测结果分布趋势一致,预测值较最大实测值平均偏大12.1%。该方法可以用于预测富水深厚砂卵石地层深基坑降水引起的地层沉降。

Based on the deep foundation pit of Luoyang rail transit station,boundary conditions of the numerical calculation model was corrected by the use of the measured data of dewatering in this paper. Then, the precipitation funnel curves with different dewatering depths and aquifer thicknesses under open conditions were caculated and numerically fitted.Afterly,the fitting function was introduced into the soil compaction calculation formula to predict the ground settlement outside the foundation pit.The prediction method was verified by the measured data.The results show that the predicted results are consistent with the measured results,and the predicted values are 12.1% larger than the measured maximum on average.The method can be used to predict the stratum settlement caused by deep foundation pit dewatering in water-rich and deep sandy pebble stratum.