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为了提高传统顺层岩质边坡地震响应的时程分析方法的计算效率,以及在地震作用下边坡动力可靠度评价指标的选取方法中考虑地震随机性的特征,运用Newmark-β法和MATLAB/Simulink工具建立了顺层岩质边坡地震响应的简化计算方法,基于Monte Carlo法进一步给出了安全系数与可靠度时程的计算方法。根据边坡工程技术规范中规定的边坡稳定安全系数最低要求值和实际工程中可接受的边坡最大允许破坏概率,提出了最低安全要求可靠度和最大允许失效可靠度2个新的评价指标,并给出了相应的计算方法。最后,采用2个新的评价指标对地震作用下边坡动力可靠性进行综合评判。结果表明:提出的顺层岩质边坡地震响应简化计算方法合理可行,且具有较高的计算效率和精度;与其他的边坡地震可靠度评价方法相比,该方法采用2个新的评价指标评价地震作用下边坡动力可靠性的方法可靠,其考虑了边坡地震可靠度随机性的特征,且与边坡工程技术规范和实际工程风险相结合,计算结果能更真实地反映地震作用下边坡的安全状况,更具合理性和工程适用性。
In order to improve the computational efficiency of the time-history analysis method of the seismic response of the conventional bedding rock slope and to consider the randomness of the earthquake in the selection method of the reliability evaluation index of the slope under the earthquake, the Newmark-β method and the MATLAB / Simulink tool is used to establish a simplified method to calculate the seismic response of bedding rock slope. Based on Monte Carlo method, the calculation method of safety factor and reliability time history is given. According to the minimum required value of slope stability safety factor and the acceptable maximum allowable failure probability of slope in practical engineering, two new evaluation indexes are put forward, namely, the minimum safety requirement reliability and the maximum allowable failure reliability , And gives the corresponding calculation method. Finally, two new evaluation indexes are used to evaluate the dynamic reliability of slope under earthquake. The results show that the simplified calculation method of seismic response of bedding rock slope is reasonable and feasible, and has high computational efficiency and accuracy. Compared with other slope reliability evaluation methods, this method uses two new evaluation methods The method of evaluating the reliability of slope dynamic under earthquake is reliable, which takes into account the randomness of seismic reliability of slope and is combined with the engineering specifications of the slope and the risk of actual project. The calculation results can more truly reflect the influence of the seismic action Slope security, more reasonable and engineering applicability.