摘要
天然边坡在削坡工程施工阶段或竣工后,往往形成上下部不同坡度的边坡。离心模型试验与现场试验结果表明,这类边坡有两种破坏模式。一种是滑裂面始于坡顶,另一种是滑裂面始于坡面。利用极限分析上限法理论讨论并确定边坡发生不同破坏模式的条件,从而给出极限开挖深度、设计开挖深度小于极限开挖深度时的稳定安全系数以及设计开挖深度大于极限开挖深度时的土压力,为解决天然边坡削坡工程中的稳定性设计问题提供理论依据。
During or after cutting of natural slopes, different gradients of slopes are usually formed on the upper part and the lower part. According to results of centrifuge model tests and in-situ tests, there are two failure patterns of the slopes. One is the failure plane starting at the top of the slopes, and the other is the failure plane starting on the surface of the slopes. The critical depth of the two failure patterns were calculated by use of the upper-bound theory. Through comparison between the two critical depths under same conditions, the conditions for occurrence of the two failure patterns were discussed and defined. Then the critical depth, safety factor in case of the excavation depth less than the critical depth and the soil pressure in case of the excavation depth larger than the critical depth were given. These results were meaningful to the design of slope cutting.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2008年第4期566-573,共8页
Chinese Journal of Geotechnical Engineering
关键词
边坡
削坡
上限法
离心模型试验
极限开挖深度
稳定安全系数
土压力
slope
slope cutting
upper-bound method
centrifuge model test
critical excavation depth
safety factor
earthpressure
