摘要
边坡稳定的极限分析方法只适用于比例加载的情况。当其上所受到的全部或部分载荷发生往复变化时,应该采用安定分析来评价边坡的安全性。通常边坡除了受到恒定的重力作用以外,地下水的作用也是一个不能忽视的因素。而由于降雨等原因,地下水位往往会在一定范围内往复变化,使得在稳定的地下水位以上的部分岩土体经常处于干湿循环的状态。根据率形式的Koiter机动安定定理,提出了考虑地下水位往复变化情况的边坡安定上限分析方法。利用抗剪强度参数折减定义的安全系数,定量地计算载荷变化对边坡稳定性的影响。最后通过一个直立边坡的简单算例证明了提出的分析方法的有效性。
Upper bound limit analysis of slope stability is only applicable for proportional loading. In case of alternate loading and unloading, a shakedown analysis is necessary for its long term safety evaluation. Actually, besides gravity load, groundwater is also an important factor to slope stability. However, groundwater level usually changes with the rainfall or some other environmental factors, which may induce alternate wetting and drying to part of the slope. This is a disadvantage for the slope safety. In this paper, an upper bound shakedown analysis based on strong version of Koiter's theorem is presented to analyze slope stability under such as an alternate load. Safety factor, which is defined by shear strength reduction of the materials, is adopted by a quantitative analysis to represent the influence of alternate load on slope stability. A simple example is adopted to verify the availability of this method.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2004年第11期1693-1697,共5页
Rock and Soil Mechanics
