基于强度折减动力分析法的岩体边坡稳定性分析  

Rock Slope Stability Analysis by Strength Reduction Dynamic Method

作　　者：聂柏松[1] 沈振中[2] 仲良[1] 高金强[3] 

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学水资源高效利用与工程安全国家工程研究中心,江苏南京210098 [3]水利部海河水利委员会水资源保护科学研究所,天津300170

出　　处：《水电能源科学》2013年第9期131-134,共4页Water Resources and Power

基　　金：江苏省自然科学基金青年基金资助项目(SBK201240863)

摘　　要：针对在强度折减动力分析法中折减系数与关键点位移关系曲线拐点不易判断的问题,采用强度折减法将边坡岩土体的内聚力、内摩擦角、抗拉强度折减后,利用数值分析软件进行静动力计算,以边坡潜在滑动体关键点位移时程曲线和折减系数与关键点位移关系曲线判断出折减系数的范围,通过分析绘制在同一坐标系下不同折减系数时潜在滑动体关键点位移时程曲线的变化趋势,较为准确地确定拐点及其相应的稳定安全系数,并以浩口水电站厂房后缘边坡为例,通过对其进行动力稳定性分析,验证了所提方法的可行性和合理性。There exist limitations when evaluating the seismic stability of a slope by traditional pseudo static method or time history of safety factor analysis method. Static and dynamic calculations are conducted after reduction of shear strength and tensile strength. Stability and the safety factor are estimated based on the trend of the key points＇ displace- ments and reduction factor-displacement curves of the key points at the end of the earthquake. A relatively accurate inflec- tion point and corresponding safety factor are determined through analysis of the key points＇ displacements under different reduction factor in the same coordinate system. As an application of this method, the seismic stability of a slope behind Haokou hydropower plant is evaluated and the safety factor under earthquake is obtained, which verifies the feasibility and rationality of the proposed method for slope stability analysis.

关 键 词：边坡 动力稳定性 地震作用 强度折减动力分析法 位移时程曲线 折减系数 

分 类 号：TU457[建筑科学—岩土工程]