基坑降水引起坑外建筑桩基均匀沉降的计算方法

基坑降水引起坑外既有建筑桩基沉降过大的工程案例时有出现。基于基坑降水引起坑外建筑桩基沉降产生的机理分析,分析了基坑降水引起坑外地下水水位的变化规律,建立了计算桩基均匀沉降的地下水位简化计算方法以及有效自重增量计算方法,给出了详细的基坑降水引起坑外桩基均匀沉降的计算步骤。以扬中某基坑工程为例,说明了该方法的可行性和合理性,为基坑降水预测周边建筑的桩基沉降提供了有效且简便的方法。

Calculation method for uniform settlement of pile foundations outside pits caused by foundation pit dewatering

The project case where the excessive settlement of the existing pile foundation outside the pit caused by the foundation pit precipitation has appeared occasionally. Based on the analysis of the mechanism of pile foundation settlement caused by foundation pit precipitation, the variation law of groundwater level outside the pit caused by foundation pit precipitation is analyzed, and the simplified calculation method of groundwater level for calculating settlement of pile foundation and the calculation method of effective weight increment are established. The detailed calculation steps of uniform settlement of pile foundation caused by foundation pit dewatering are given. Taking a foundation pit project in Yangzhong as an example, the feasibility and rationality of the method are illustrated, which provides an effective and simple method for predicting pile foundation settlement of surrounding buildings.