摘要
土体的稳定和变形是密不可分的,由于土体材料本身可能具有应变软化特性,失稳破坏首先开始于土体内最薄弱的区域,逐渐贯穿,因此土坡破坏是一个局部破坏逐渐扩展以至贯通形成滑裂面的渐进破坏过程。采用有限单元法可以将稳定问题和土体内部的应力和变形分析结合起来。本文即采用强度折减有限元方法,运用摩尔-库仑屈服准则对逆作基坑稳定进行强度折减有限差分法数值模拟,并将分析结果分别与Junbu法,瑞典条分法和Prandtl(普朗德尔)法计算结果进行对比。发现由于开挖与支护的影响,逆作法土体滑裂面有别于边坡土体滑裂面,得到支护墙体的不同位置处土体破坏模式。
The soil stability and deformation is inseparable and the soil material itself may have a strain softening properties,slope failure is a partial failure gradually extended to form slip crack. Combined the stability and the internal stress and deformation analysis of the soil with the finite element method in the article,base on the strength reduction theory to analysis the safety factor of the whole process of TDCM,and compared the analysis results with Junbu method,Sweden slice method and Prandtl method. Due to the influence of excavation and supporting,the soil slip crack surface of TDCM is different from the slope soil slip crack surface. Get the soil failure mode of the support of the wall in different position.
出处
《土木工程学报》
EI
CSCD
北大核心
2013年第S1期314-318,共5页
China Civil Engineering Journal
基金
国家自然科学基金(51108135)
哈尔滨工业大学科研创新基金(2012092)
季节性冻土区铁路列车行驶路基震动反应与稳定性研究(51078111)
关键词
逆作法
有限差分法
强度折减
深基坑
Top-Down Construction Method(TDCM)
finite difference method
strength reduction
deep foundation pit
