基于非确定性分析法的顺层边坡抗震性研究

Measurement of the Seismic Behavior of Bedding Slopes Based on Uncertainty Analysis

顺层岩质边坡的抗震性指标大部分都是非确定的,无法用固定阈值衡量。提出基于非确定性分析法的顺层边坡抗震性性能研究,将顺层岩质边坡看作若干个叠加的薄板;运用非确定性分析法计算各个薄板的动力安全系数和动力极限状态方程,并对顺层边坡动力极限状态方程进行求解,可得在地震作用力下顺层边坡动力可靠度指标与顺层边坡失效概率之间的关系;评估地震作用力下顺层边坡整体稳定性,同时综合考量顺岩边坡的最小平均安全系数以及平均失效概率,得出评估结果。实验结果显示,在地震作用力下,顺层边坡坡高、坡角、岩层倾角对顺岩边坡抗震性能影响显著,评估结果与实际结果一致。

Seismic indexes of bedding rock slopes are mostly uncertain and cannot be measured by a fixed threshold.An uncertain analysis-based method of measuring the seismic behavior of bedding rock slopes is proposed.The bedding rock slope is regarded as several superimposed thin plates.The dynamic safety factor and the dynamic limit state equation of each thin plate are calculated by an uncertain analysis method,and the dynamic limit of bedding rock slope is calculated.The relationship between the dynamic reliability index and failure probability of the bedding slope under earthquake can be obtained by solving the dynamic limit state equation,and the overall stability of the bedding slope can be evaluated under seismic force.The minimum average safety factor and average failure probability of the bedding slope can be comprehensively considered,and the evaluation results can be obtained.The experimental results show that the height,angle,and dip angle of the bedding slope have a significant influence on the seismic performance of the bedding slope under seismic force,and the evaluation results are consistent with the actual results.