摘要
基坑工程中地层的应力状态和应力路径随着开挖的进行而不断变化。采用有限元手段分析基坑侧壁发生指向坑内或坑外水平位移的原因,指出基坑的变形实际上就是卸荷作用下向外、隆起和土材料模量降低引起的向内、沉降两种相反的作用相互消长的结果。针对某基坑工程水平位移的应急计算,对采用有限元法如何较好地用于基坑位移预测进行探讨。如果有前期一定开挖深度时的实测资料对参数和计算结果进行修正,是能够实现准确预测的。
Stress state and stress path in the soil layers vary continually in the process of foundation pit excavation. This paper uses a finite element method to analyze the cause of pit wall displacement in the inward or outward horizontal directions. The analysis reveals that the displacements are actually a consequence of two opposing actions： subsidence and inward movement that are induced by uplift, outward movement and soil stiffness reduction under unloading condition. A contingency analysis on the foundation pit displacement for a practical project is presented to demonstrate how to make a better prediction. It shows that a more accurate prediction is possible if at the stage of certain excavated depth, in-situ test data are used to adjust the calculations and related parameters.
出处
《水力发电学报》
EI
CSCD
北大核心
2013年第1期223-229,共7页
Journal of Hydroelectric Engineering
基金
国家自然科学基金面上项目(50979047)
国家重点基础研究发展计划(973)项目(2010CB732103)
关键词
岩土力学
位移
有限元
基坑
开挖
rock and soil mechanics
displacement
finite element method
foundation pit
excavation
