不同列车荷载简化方式对临近基坑扰动效应的对比分析  

Comparative Analysis on Disturbance Effects of Different Simplified Modes of Train Load on Adjacent Foundation Pits

作　　者：师雯琦 杨双锁[1] 牛少卿[1] 陈浩[1] SHI Wenqi;YANG Shuangsuo;NIU Shaoqing;CHEN Hao(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《矿业研究与开发》2022年第2期76-81,共6页Mining Research and Development

基　　金：国家自然科学基金项目(U1710111);山西省重点研发计划重点项目(201703D111027).

摘　　要：为研究列车动荷载简化方式对临近基坑地连墙稳定性的影响,以太原太钢翻车机系统基坑工程为背景,运用数值模拟的方法,在不同列车荷载简化形式下,对基坑分步开挖施工过程中地下连续墙工程的墙侧位移与临近地表沉降进行分析,以对比得出在不同工况下,各阶段安全系数更高的一组模拟数据,并记录与其相对应的荷载简化方式,为诸如此类需要考虑列车荷载的工程提供模型计算与荷载简化的思路。分析结果表明:列车荷载对地连墙临近地表的沉降影响显著,其影响范围约为1~10 mm;而列车荷载对地连墙墙体侧移的影响范围仅为-2~2 mm,但其作用效果相较于沉降更为复杂多变,在建立数值模型时应根据实际施工工况的不同,选择与之相对应的更为合理的列车荷载简化形式。In order to study the influences of the simplified modes of dynamic train load on the stability of the underground continuous wall in the adjacent foundation pit, taking the foundation pit project of Taiyuan TISCO dumper system as the background, numerical simulation was carried out. The wall side displacement and adjacent surface settlement of the underground continuous wall project during the step-by-step foundation pit excavation were analyzed under different simplified modes of train load. A set of simulation data with a higher safety factor at each stage was obtained by comparison under different working conditions, and the corresponding load simplified mode was recorded, so as to provide ideas for model calculation and load simplification in such projects that need to consider train load. The results show that the train load has a significant influence on the ground surface settlement near the continuous wall, and its influence range is about 1~10 mm. The influence range of train load on the wall side displacement of continuous wall is only-2~2 mm, but its effect is more complex and changeable than settlement. As establishing the numerical model, a more reasonable simplified mode of train load should be selected according to the different actual construction conditions.

关 键 词：基坑开挖 列车动荷载 地下连续墙 地表沉降 墙体侧移 

分 类 号：TU435[建筑科学—岩土工程] TD327[建筑科学—土工工程]