极端冰雪条件下岩石边坡倾覆稳定性分析  

OVERTURNING STABILITY ANALYSIS OF ROCK SLOPE UNDER EXTREME SNOW DISASTERS CONDITIONS

作　　者：张永兴[1,2] 宋西成[1] 王桂林[1,2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400030

出　　处：《岩石力学与工程学报》2010年第6期1164-1171,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家科技支撑计划项目(2008BAC47B02)

摘　　要：探讨极端冰雪作用,推导典型岩石边坡在极端冰雪条件下倾覆稳定系数的表达式。通过计算分析,揭示饱水岩石边坡倾覆稳定系数在不同的坡角、坡高、滑面倾角和张裂隙深度情况下随冻深变化的规律性,绘制饱水岩石边坡倾覆稳定系数与边坡几何要素之间的关系图;同时分析非饱水状况下岩石边坡倾覆稳定系数随冻深、坡角、坡高、滑面倾角、张裂隙积水深度等变化时的变化规律。研究表明,当考虑极端冰雪灾害影响时岩石边坡倾覆稳定系数发生较为明显的变化:随冻深、滑面倾角、张裂缝深度、坡高等的增大而下降,随坡角的减小而减小,冻结深度是影响岩石边坡倾覆稳定性的主要因素之一。Firstly,the calculation formula for coefficient of overturning stability under the condition of extreme snow disaster is derived.Secondly,the regularity for coefficient of overturning stability with the changes of frost depth is revealed,which considers different slope angles,slope heights,dip angles of the slide plane,and depths of tension fractures for saturated rock slope.Diagrams which express the relationship between the coefficients of overturning stability and geometric factors are drawn when the rock slope is saturated.Then the variation of the coefficient of overturning stability for unsaturated rock slope is revealed,which also considers different geometric factors such as frost depth,slope angle,slope height,dip angle of the slide plane,and the water-emerging depth of tension fractures and so on.The conclusions can be drawn that the coefficient of overturn stability of rock slope changes significantly when considering the impact of extreme snow disaster.The bigger the frost depth,dip angle of the slide plane,the depth of tension fractures and slope height are,the smaller the coefficient of overturning stability is.The smaller the slope angle is,the smaller the coefficient of overturning stability is.The frost depth is one of the main factors which impact the overturning stability of rock slopes.

关 键 词：边坡工程 岩石边坡 极端冰雪灾害 倾覆稳定性 冻深 

分 类 号：P642.22[天文地球—工程地质学]