摘要
深基坑开挖引起的应力变化将不可避免地导致土体位移,进而对邻近隧道产生诸多的不利影响。采用有限差分软件FLAC3D对基坑的开挖支护过程进行了三维动态模拟分析,在不影响顶管隧道安全使用的前提下,验证了基坑开挖采用桩锚支护结构的可行性,同时,基坑施工对顶管隧道的水平位移不均匀变形影响要强于竖向位移不均匀变形的影响,易使得顶管隧道在水平方向出现拉弯破坏,采取对基坑被动区土体进行旋喷桩加固的措施,可以减弱其对顶管隧道的影响。
The stress change caused by deep foundation excavation will inevitably lead to soil displacement,which will have many adverse effects on adjacent tunnels.The finite difference software FLAC 3 D was used to conduct three-dimensional dynamic simulation analysis of the excavation and support process of the foundation pit.Considering not affecting the safe use of tube jacking tunnel,the feasibility of adopting pile anchor support structure for foundation pit excavation was verified at the same time.The influence of foundation pit construction on the uneven deformation of horizontal displacement of pipe jacking tunnel is stronger than that of the uneven deformation of vertical displacement.The effects of rotary jet pile reinforcement on the soil mass in the passive area of foundation pit can be reduced.
作者
王涛
余建民
WANG Tao;YU Jianmin(School of Earth Science and Engineering,North China University of Water Resources and Electric Power,Zhengzhou,He’nan 450046,China)
出处
《水利与建筑工程学报》
2019年第6期200-204,共5页
Journal of Water Resources and Architectural Engineering
关键词
基坑开挖
顶管隧道
变形
数值模拟
excavation of foundation pit
pipe jacking tunnel
deformation
numerical simulation
