摘要
针对如何有效控制深基坑周边地表沉降问题,基于流固耦合与三维固结理论,应用有限元软件midas GTS NX模拟分析不同工况下的深基坑坑外地表沉降变形。研究表明:基坑周边地表沉降区存在一个将沉降划分为不同因素主导的分界线,界线以内为基坑开挖主导沉降区,界线以外为基坑降水主导沉降区。随着施工进程的推进,界线的位置在不断变化,由最初位于距基坑边缘约21 m~23 m(1.69H~1.85H)范围内,移动到距基坑边缘约8 m(0.65H)处,后移动到距基坑边缘约10 m~14 m(0.81H~1.13H)范围内。因此,在实际工程中,应根据被保护建(构)筑物所处的位置与所关注的施工进程,先判断其所在区域沉降的主导因素,然后采取针对性措施,以达到更加精准控制基坑周边地表沉降的目的。
In order to effectively control the surface settlement around deep foundation pit,finite element software MIDAS GTS NX was used to simulate and analyze the surface settlement deformation outside deep foundation pit under different working conditions based on the fluid-structure coupling and three-dimensional consolidation theory.The results show that the surface settlement area around the foundation pit has a boundary that divides the settlement into different factors.Within the boundary,the foundation pit excavation dominates the settlement area,while outside the boundary,the foundation pit dewatering dominates the settlement area.With the progress of construction,the position of the boundary line is constantly changing from about 21 m~23 m(1.69H~1.85H)away from the edge of the foundation pit at the beginning,to about 8 m(0.65H)away from the edge of the foundation pit,and then to about 10 m~14 m(0.81H~1.13H)away from the edge of the foundation pit.Therefore,in practical project,according to the location of the protected structures and the concerned construction process,we should first judge the leading factors of the regional settlement,and then take specific measures to achieve a more accurate control of the ground settlement around the foundation pit.
作者
李明
李化明
LI Ming;LI Huaming(School of Civil Engineering,Jiamusi University,Jiamusi,Heilongjiang 154007,China)
出处
《水利与建筑工程学报》
2023年第4期80-88,共9页
Journal of Water Resources and Architectural Engineering
基金
黑龙江省自然科学基金项目(LH2022E108)。
关键词
流固耦合
深基坑
地表沉降
沉降界线
fluid-structure coupling
deep foundation pit
surface subsidence
settlement boundary
