摘要
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 traditional time history analysis method for seismic response of bedding rock slopes and consider the random characteristics of earthquake in the selection method for evaluation index of dynamic reliability of slopes under earthquake action,a simplified calculation method for seismic response of bedding rock slopes was established using the Newmark-β method and Matlab/Simulink. And then the calculation methods for time histories of safety factor and reliability were further given based on the Monte Carlo method.According to the specified minimum of safety factor of slope stability in the technical specification for slope engineering and the maximum allowable failure probability of slope in practical engineering,two new evaluation indexes,that is,minimum safety-requiredreliability and maximum allowable failure reliability as well as the corresponding calculation methods were put forward.Moreover,dynamic reliability of slopes under earthquake action was comprehensively assessed by two new evaluation indexes.The results show that the proposed simplified calculation method for seismic response of bedding rock slopes is reasonable and feasible,with high calculation efficiency and accuracy.The proposed evaluation method for dynamic reliability of slopes by dint of two new evaluation indexes under earthquake action is reliable,compared with other evaluation methods.It takes the random characteristics of seismic reliability of slopes into account.Combining the seismic reliability of slopes with the technical specifications of slope engineering and practical engineering risks,the computing results can realistically reflect the security status of slope under earthquake action.Hence,the results with high rationality apply to the practical engineering.
作者
陈训龙
高荣雄
龚文惠
李逸
彭永浩
CHEN Xun-long GAO Rong-xiong GONG Wen-hui LI Yi PENG Yong-hao(Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan 430074, Huhei, Chin)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2017年第7期33-40,共8页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51278217)
华中科技大学研究生创新创业基地项目(0118650010)
