南昌某地铁深基坑施工对周围地表沉降的影响因素分析

Analysis of Factors Affecting the Surface Settlement of a Subway Deep Foundation Excavation in Nanchang

以南昌某临近运营铁路的深基坑工程为背景,通过分析现场实际监测数据,探讨了深基坑施工对周围地表沉降的影响因素。结果表明:随着时间和测距的增加,周围地表的沉降量都呈先增大后减小的趋势;本工程采用的增加灌注桩来进行土体加固并限制土体的横向移动来进行铁路干线的加固隔离,起到了很好的作用;并且预轴力支撑的架设,考虑基底的回弹隆起,利用时空效应的施工均在一定程度上减小了周围地表的沉降量。

Based on the deep foundation excavation engineering of a near operating railway in Nanchang,the influence factors of the deep foundation excavation construction on the surrounding ground settlement are discussed through the analysis of the actual monitoring data on the site.The results show that the settlement of the surrounding ground increases with the increase of time and distance,and the increase of the settlement of the surrounding surface is increasing and then decreasing.The reinforcement of the soil and the lateral movement of the soil to carry out the reinforcement and isolation of the railway trunk is adopted in this project,and it has played a very good role,and the erection of the preaxial force support is considered.The springback uplift of the basement has reduced the settlement of the surrounding surface to some extent by the construction of the time and space effect.