考虑结构面震动劣化效应的岩质边坡块体动力稳定性评价  

Dynamic stability evaluation of rock slope blocks considering vibration degradation effect of structural plane

作　　者：高丙丽[1] 刘拴 任建喜[1] 蔡智云[2] 张金厚 张路青[3] Gao Bingli;Liu Shuan;Ren Jianxi;Cai Zhiyun;Zhang Jinhou;Zhang Luqing(Xi'an University of Science and Technology,Xi'an 710054,China;Northwest Hydropower Engineering Co.,Ltd.,Powerchina,Xi'an 710065,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]西安科技大学,陕西西安710054 [2]中国电建西北勘测设计研究院有限公司,陕西西安710065 [3]中国科学院地质与地球物理研究所,北京100029

出　　处：《土木工程学报》2024年第1期97-110,共14页China Civil Engineering Journal

基　　金：国家重点研发项目(2019YFC1509703);陕西省重点研发计划(2021ZDLGY07-08)。

摘　　要：为解决岩质边坡块体在地震作用下的动力稳定性评价问题,基于结构面的循环剪切数值试验研究结构面的震动劣化效应,从而构建结构面震动劣化数学模型;结合坐标投影原理提出考虑结构面强度震动劣化效应的块体动力稳定性系数计算方法;基于数值分析法研究地震波波动特性对岩质边坡块体稳定性的影响,并进一步基于突变理论提出位移动力响应放大系数突变判据,最后形成一套以块体动力稳定性系数时程曲线和位移动力响应放大系数共同评价块体动力稳定性的评价体系,拓展地震作用下块体动力稳定性评价新思路。研究表明,结构面震动劣化效应不仅受循环剪切幅值、循环剪切次数及相对运动速度影响,还与起伏角度密切相关;通过算例证实了考虑结构面震动劣化的块体动力稳定性系数计算方法的准确性,所提出的以块体动力稳定性系数时程曲线和位移动力响应放大系数的共同评价体系更加安全可靠,将促进块体动力稳定性理论的发展,对边坡地质灾害的防治具有重要的科学意义和应用价值。To evaluate dynamic stability of rock slope block under seismic action,the seis-mic degradation effect of the structural plane is studied based on the numerical cyclic shear test of the structural plane,in order to establish the mathematical model of seismic degrada-tion of the structural plane.Based on the principle of coordinate projection,the calculation method of dynamic stability coefficient of rock block considering the degradation effect of structural plane strength vibration is proposed.By adopting the numerical analysis method,the influences of seismic wave fluctuation characteristics on the stability of rock slope blocks are studied,and furthermore the mutation criterion of displacement dynamic response ampli-fication coefficient is proposed based on the mutation theory.Finally,an evaluation system for the dynamic stability of rock blocks is established by combining the time-history curve of the block dynamic stability coefficient with the displacement dynamic response amplification coefficient,so that the block dynamic stability evaluation method under seismic action can be extended.The research results show that the seismic degradation effect of the structural plane is affected by the cyclic shear amplitude,shear cycles,and relative motion velocity,and it is also closely related to the undulation angle.The accuracy of the calculation method of the block dynamic stability coefficient considering the seismic degradation of the structural plane is verified by the study case.The proposed evaluation system is safe and reliable,which shall be beneficial to the development of the block dynamic stability theory as well as the prevention and control of slope geological disasters.

关 键 词：结构面震动劣化 岩质边坡块体 坐标投影 失稳判据 动力稳定性评价 

分 类 号：TU457[建筑科学—岩土工程]