摘要
为研究深基坑开挖过程中钢支撑轴力的变化情况,以沈阳市南北快速干线隧道深17.8 m基坑工程支护体系中横向钢支撑为研究对象,对基坑开挖过程中的轴力变化值进行现场实时监测,并采用有限元软件MIDAS/GTS对不同工况下的钢支撑轴力进行模拟研究,得出各道钢支撑的轴力云图及变化规律。结果表明:1)随着基坑开挖深度的增加,坑壁主动土压力逐渐增大,使得每道钢支撑轴力在短期内均呈线性增长趋势;2)同一断面钢支撑全部架设完成后轴力有所衰减,其原因之一是连续墙后的土体发生了流变现象,使得土体应力重新分配并达到新的平衡。
In order to study the variation laws of steel support axial force during excavation of a deep foundation pit of Shenyang North-South Expressway Tunnel with burial depth of 17. 8 m,the axial force of horizontal steel supports of the supporting system is studied. And then the real-time monitoring of axial force variation during excavation of foundation pit is conducted. Finally,the axial force of steel supports under different conditions is simulated by finite element software MIDAS/GTS,and the axial force nephograms and variation laws of every steel support are obtained. The results show that:( 1) With the increase of excavation depth of the foundation pit,the active earth pressure on the foundation pit wall increases gradually,which makes the axial force of every support increase linearly in a short period.( 2) The axial force of every steel support in a same cross-section attenuates after the whole erection of the steel supports,whose cause lays on soil stress redistribution-caused balance after rheology behavior of soil behind underground diaphragm wall.
作者
金生吉
陈华
舒哲
何丽娟
JIN Shengji;CHEN Hua;SHU Zhe;HE Lijuan(School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870,Liaoning, China;MCC Capital Engineering & Research Incorporation Ltd. , Beijing 100176, China)
出处
《隧道建设(中英文)》
北大核心
2018年第5期740-746,共7页
Tunnel Construction
基金
辽宁省自然科学基金项目(2015020583)
辽宁省教育厅基金项目(201564068)
关键词
公路隧道
深基坑
钢支撑
轴力
监测
数值模拟
expressway tunnel
deep foundation pit
steel support
axial force
monitoring
numerical simulation