极端冰雪条件下的顺层岩质边坡滑移稳定性分析  

Sliding Stability Analysis of Bedding Rock Slope Considering Extreme Snow Disasters

作　　者：张永兴[1,2] 王韵斌[1] 宋西成[1] 

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：《防灾减灾工程学报》2011年第4期351-357,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家科技支撑计划项目(2008BAC47B02)资助

摘　　要：推导了典型岩石边坡在极端冰雪条件下的滑移稳定系数的表达式;通过计算分析,揭示了岩石边坡滑移稳定系数随裂隙内水深、坡高、坡角、滑面倾角等因素变化的规律及与冻深的关系,并绘制岩石边坡滑移稳定系数与边坡几何要素之间的关系图。研究表明,当考虑极端冰雪灾害影响时,岩石边坡滑移稳定系数发生较为明显的变化:随裂隙饱水程度、坡面角、主滑面倾角的增加而降低,随主滑面抗剪强度的减小而降低;裂隙饱水程度越高、坡体高度越低、坡面角越小、主滑面倾角越大的边坡的滑移稳定系数,对裂隙冰冻胀力的反应越敏感。Firstly,the calculation formula of the safety factor on sliding stability in condition of extreme snow disaster is derived.Secondly,through the calculation and analysis,the variation law of the safety factor on sliding stability with the changes of water depth in cracks,slope height,slope angle,inclination of structural surface of rock slope is revealed,so is the relationship between the factor and frost depth.Then diagrams which express the relationship between the coefficients of sliding stability and geometric factors are drawn when the rock slope is saturated.Studies show that,when considering the impact of extreme snow disaster,the safety factor on sliding stability of rock slope changes significantly.The safety factor decreases when the depth of the water in cracks,slope angle and inclination of structural surface increase,and when the shear strength of structural surface decreases.The effect of the frost pressure on the safety factor of sliding slope is more obvious when the depth of water in cracks is greater,slope height is lower,slope angle is smaller,and inclination of structural surface is bigger.At last,several suggestions are given for prevention and control measures of sliding slope.

关 键 词：冰雪灾害 岩质边坡 冻深 冻胀力 稳定性分析 

分 类 号：U213.1[交通运输工程—道路与铁道工程]