紧邻运营铁路深基坑围护结构动态响应分析

本文利用ABAQUS有限元软件动态模块对紧邻兰新铁路某深基坑围护结构在列车动荷载作用下的动态响应进行了分析，首先根据实测数据和列车振动简化模型得到了列车竖向振动荷载时程曲线，然后建立三维有限元模型分析了列车振动荷载作用下围护桩顶水平加速度、水平振动位移及沿桩长方向水平加速度变化规律，并对基坑围护结构的稳定性进行了评价，提出了防止基坑围护结构过度振动的措施，研究结论可为类似工程提供借鉴与参考。

Dynamic Responses Analysis of Enclosure Structure of Foundation Pit Next to Railway

The enclosure structure dynamic response analy-sis of deep foundation pit next to lanzhou-xinjiang railway are systematically studied on the basis of ABAQUS/Explicit. Firstly the time-history curve of vertical vibration load are achieved ac-cording to test data and simplified vibration model of train, and then the variation law of horizontal acceleration and vibration dis-placement of pilebolck and the horizontal acceleration along the pile length direction under the vibration load are analyzed by three-dimensional finite element model, and the stability of en-closure structure is evaluated reasonably. The measures preven-ting pit supporting structure from excessive vibration are pro-posed. Therefore, the research results can provide reference for the similar projects.