竖向排水井地基工后沉降预测

预测工后沉降是排水固结预压加固软土地基的关键问题之一.根据等应变竖向排水井地基固结理论,提出了沉降曲线的近似计算方法.通过实测沉降资料与近似理论曲线的拟合,获得竖向排水井地基的最终沉降量和平均固结度,从而预估其工后沉降量.将该方法分别应用于真空预压和堆载预压处理的竖井地基,进行工后沉降预测,结果表明该方法是可行的.

Estimation of post construction settlement of ground with vertical drains

Estimation of the post construction settlement of the ground improved by preloading drainage is one of the most critical problems. Based on the consolidation theory of ground with vertical drains under the condition of equal vertical strain, approximate theory settlement curve calculation method is put forward. The least squares optimization method is used to best fit the theory settlement curve with the measured settlements and to determine total primary settlement and average consolidation degree, consequently post construction settlement can be estimated. The method is applied to two cases histories of ground with vertical drains improved by vacuum preloading and surcharge respectively to predict post construction settlement. It is verified that the method is applicable to engineering.