考虑地震力作用方向的危岩稳定性研究  

Study of Stability of Dangerous Rock Considering Action Direction of Seismic Force

作　　者：刘海军[1] 赵建军[2] 祝正南 许文桓[1] 黄健[2] 

机构地区：[1]国核电力规划设计研究院重庆有限公司,重庆401121 [2]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059 [3]重庆136地质队,重庆401147

出　　处：《三峡大学学报（自然科学版）》2014年第3期61-65,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(41102190)

摘　　要：在危岩稳定性评价中,地震力作用方向是一个极为重要的因素.为解决目前危岩稳定性评价中仅把地震力作用方向假定为水平向的问题,借助函数极值理论提出了地震力最危险的作用方向的计算公式,并结合圆形分布进行验证.最后,利用该公式研究了四川某公路隧道出口段不同类型危岩的最危险地震力作用方向,分析结果表明：地震力最危险作用方向在347.4～359.8°,与水平面夹角随着地震动峰值加速度增大而减小,并且当地震动峰值加速度超过0.4g,地震力最危险作用方向与水平面夹角在0～30°,此时危岩体可能产生抛射破坏.The direction of seismic force is an extremely important factor in the stability assessment of dangerous rock.Now in the stability assessment of dangerous rock,it takes the horizontal direction as the action direction of seismic force.To resolve this problem,a calculation method considering the critical direction of seismic force is put forward with theory of function extreme values,and it is verified by circular distribution.Finally,we use the formula to study the different types of dangerous rock＇s critical seismic force direction at a road exit zone in Sichuan Province.The analysis shows that：the critical action direction of seismic force is from 347.4°to 359.8°,the angle between the action direction and horizontal plane will be decreased as the increase of the peak ground acceleration; and when the peak ground acceleration is more than 0.4g,the angle between the critical action direction of seismic force and horizontal plane is from 0°to 30°,at that time the dangerous rock may failure in the mode of trajectory.

关 键 词：危岩 地震力最危险作用方向 圆形分布 拟静力法 

分 类 号：TU943.2[建筑科学—建筑技术科学]