基于验算点法的地震力作用下边坡可靠性分析

发布时间：2018-02-08 09:03

本文关键词： 道路工程高边坡传递系数法可靠性分析地震力验算点法　出处：《中国公路学报》2016年11期 　论文类型：期刊论文

【摘要】：为了给地震力作用下滇西南地区高边坡稳定性分析提供一种切实可行的可靠性分析方法,针对地震力作用下影响边坡可靠性计算的主要变量(主要考虑地震力的随机性和不确定性、边坡岩土体抗剪强度参数的不确定性),并全面考虑变量的实际分布规律和变量之间的相互关系,采用传递系数法建立引入地震力作用的边坡极限状态方程,再采用验算点法对极限状态方程进行求解,对其中非正态变量进行当量正态化处理。通过对极限状态方程的求解和分析,得出地震力作用对边坡可靠性指标的具体影响程度、滇西南地区高边坡可靠性指标、破坏概率分别与地震力之间的关系、地震力作用下影响边坡可靠性的主要变量的分布规律。结果表明:地震力的作用对边坡的可靠性指标影响显著,地震力作用下的可靠性指标相比于无地震力作用下减少了50%~97%;滇西南地区边坡稳定的可靠性指标随着地震力的增大而减小,破坏概率随着地震力的增大而增大;不同地震烈度下的水平地震峰值加速度均近似服从极值Ⅰ型分布,抗剪强度参数均近似服从正态分布,且抗剪强度参数之间具有一定的相关性。
[Abstract]:In order to provide a feasible reliability analysis method for the stability analysis of high slope in southwest Yunnan under earthquake force, In view of the main variables (mainly considering the randomness and uncertainty of seismic force) that affect the reliability calculation of slope under the action of seismic force, Considering the uncertainty of shear strength parameters of slope and soil mass and considering the actual distribution law of variables and the relationship between variables, the limit state equation of slope with seismic force is established by using transfer coefficient method. Then the limit state equation is solved by checking point method, and the non-normal variable is treated with equivalent normalization. By solving and analyzing the limit state equation, the concrete influence degree of seismic force action on slope reliability index is obtained. The relationship between reliability index, failure probability and seismic force of high slope in southwest Yunnan, The distribution law of the main variables influencing the slope reliability under the action of seismic force. The results show that the effect of seismic force on the reliability index of slope is significant. The reliability index under the action of earthquake force is less than that under the action of no earthquake force, and the reliability index of slope stability in southwest Yunnan decreases with the increase of seismic force, and the failure probability increases with the increase of earthquake force. The peak acceleration of horizontal earthquakes under different earthquake intensities is similar to the distribution of extreme value type I, and the parameters of shear strength are similar to normal distribution, and there is a certain correlation between the parameters of shear strength.
【作者单位】：长安大学公路学院;南昌工程学院土木与建筑工程学院;云南云岭高速公路工程咨询有限公司;
【基金】：国家自然科学基金项目(40802068)
【分类号】：U416.14

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