摘要
基坑开挖导致周围既有建筑物地基承载力减损是一个值得关注的问题。本文基于工程应用较广的极限平衡理论,讨论了临近基坑既有建筑物荷载作用下地基临界滑移面的形状,提出了一种考虑基坑开挖影响的地基土破坏时临界滑移面模式,并利用滑楔法推导出相应的极限承载力估算公式。在此基础上,用给出的公式分别计算了基坑边坡、基础所处位置及土的内摩擦角取不同值时的地基极限承载力系数。将所得解答与已有文献中的试验数据和太沙基的地面水平、基础底面光滑时的理论解进行了对比分析。结果表明该方法简单实用,估算位于基坑附近一定范围内的地基承载力,效果较好。
It is notably the case that an excavation is likely to significantly reduce the bearing capacity of a nearly foundation. This paper deals with the evaluation of the beating capacity of a shallow footing located near an excavation. By means of the limit equilibrium theory the critical ground sliding surface of the excavation under the load of neighboring structure is discussed. A new failure pattern of critical sliding surface is put forward, and an estimation equation of the ultimate bearing capacity is derived by using the wedge method. With the above approach, the bearing capacity coefficients near an excavation are obtained for various slope angles, footing locations and internal friction angles. The solutions are compared with the experimental values from the literature and Terzaghi＇ s theory on the bearing capacity of flat- surface ground. The results show that the calculated values are reasonable within a certain range from the crest of excavation slope.
出处
《土木工程学报》
EI
CSCD
北大核心
2005年第8期95-101,共7页
China Civil Engineering Journal
基金
国家科学技术部专项研究基金(2002EG231201)
关键词
极限荷载
临近基坑
临界滑移面
承载力减损
limit load
near excavation
critical sliding surface
loss of bearing capacity
