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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。
In order to provide a feasible reliability analysis method for the stability analysis of high slopes in southwestern Yunnan under the action of seismic forces, aiming at the main variables that affect the reliability calculation of slopes under seismic forces (mainly considering the randomness of seismic forces and not Certainty and uncertainty of shear strength parameters of slope rock and soil mass). Considering the actual distribution law of variables and the mutual relationship between variables, the limit state equation of slope with seismic force is established by using the transfer coefficient method. Finally, the limit state equation is solved by the check point method, and the normalization of the non-normal variables is normalized. Through the solution and analysis of the equation of state of limit, the concrete influence degree of the earthquake force on the slope reliability index, the reliability index of the high slope in southwestern Yunnan, the relationship between the failure probability and the earthquake force, the earthquake force The distribution of the main variables influencing the slope reliability. The results show that the effect of seismic force has a significant impact on the reliability index of slope, and the reliability index under seismic force reduces by 50% -97% compared with that without seismic force. The reliability of slope stability in southwestern Yunnan The index decreases with the increase of earthquake force and the probability of failure increases with the increase of earthquake force. The horizontal seismic peak accelerations under different earthquake intensities all approximate the extremum type I distribution, and the shear strength parameters are approximately obeyed Normal distribution, and shear strength parameters between a certain correlation.