基坑降水施工引起高速铁路复合地基沉降的计算分析

Calculation and Analysis of Settlement of Composite Foundation of High-speed Railway Caused by Foundation Pit Dewatering Construction

基坑降水施工会引起邻近地基及建筑物的沉降变形。为保证施工安全,基于桩端刺入量理论计算分析法和现场试验监测,对高速铁路枢纽宽大站场内基坑降水施工引起的复合地基沉降量进行计算分析。分析结果表明:桩端刺入量理论分析法计算得到的沉降量较实际值偏大,需引入地基沉降系数进行修正,经修正后计算得到的地基沉降值与现场监测值基本吻合,两者相差平均值为4.2 mm,可在工程实际中借鉴运用。

Foundation pit dewatering construction will cause settlement deformation of adjacent foundation and buildings.In order to ensure the construction safety,based on the theoretical calculation and analysis method of pile tip penetration and field test monitoring,the settlement of composite foundation caused by foundation pit dewatering construction in wide station of high-speed railway terminal is calculated and analyzed.The analysis results show that the settlement calculated by the theoretical analysis method of pile tip penetration is larger than the actual value,it hence needs to introduce the foundation settlement coefficient for correction.After correction,the calculated foundation settlement value is basically consistent with the field monitoring value,and the average difference between the two values is 4.2 mm,which can be used for reference in engineering practice.