【摘要】 某高层建筑基坑在施工过程中由于没有严格按照设计施工、基坑边坡土层没有完全封闭、边坡项部和底部裸露,致使雨水从坡顶排水沟下部渗到边坡面层内,经雨水浸泡后的土体抗剪强度降低,大量土块失稳落下,喷射混凝土面层内形成了大片空洞,锚索的预应力损失,最终导致整个面层坠下,造成塌方事故。采用二分法改进的极限分析有限元法对该基坑边坡进行模拟,得到了基坑边坡的安全系数和滑动面,用二分法对土体强度参数进行折减,提高了极限分析有限元法的求解效率。更多还原

【Abstract】 The foundation pit landslide of a tall building is analyzed.The waterproof measure of supporting project has deficient.The top and foot of the foundation pit slope is not closed by concrete coverage.The rainfall enters the soil under the coverage.So the soil is scoured out.The prestressing force of the bolt lost.At last,the foundation pit landslide occurred.Limit analysis by finite element method and dichotomy are combined with together to used in foundation pit slope.Based on the mechanism of limit analysis,latent slip surface and safety factors are obtained.更多还原