摘要
坐落于背后山古滑坡前缘堆积体之上的四川省汉源县在5.12汶川特大地震中出现了罕见的高烈度异常现象。针对此种现象,利用ANSYS有限元软件分析了汶川地震对背后山古滑坡稳定性的影响。通过有限元地震时程反应分析,计算得到了汶川地震汉源背后山滑坡的安全系数时程、速度时程及位移和应力矢量场,以此分析判断此滑坡是否发生整体滑动。在此基础上,针对坡肩附近等关键部位,分析其受力和振动速度效应,并运用4种安全系数确定方法计算了滑面和关键点的安全系数值。结果表明:背后山古滑坡在汶川地震中并未发生整体滑动,但在坡肩附近会出现局部拉张开裂,高烈度异常与滑坡滑动无关。
The rare intensity anomaly phenomenon occurred in Hanyuan county which is located on front of Beihoushan ancient landslide in Sichuan Province in Wenchuan earthquake, use ANSYS to analyze the impact of Wenchuan earthquake on the stability of Beihou Mountain ancient landslide. Through finite element seismic re- sponse analysis method, the factor of safety time history, velocity time history and displacement, stress vector field were obtained, and based on above results it was judged whether the landslide slid or not as a whole. On the basis, the key parts like the slope shoulder were set to analyze the stress and vibration velocity effect. Besides, the safety factor values on the sliding surface and key points were calculated by four methods. The results show that in Wenchuan earthquake Beihoushan ancient landslide hadn＇ t slid integrally, while there were some cracks near the slope shoulder and the intensity anomaly had nothing to do with the landslide failure.
出处
《世界地震工程》
CSCD
北大核心
2015年第3期211-219,共9页
World Earthquake Engineering
基金
河北省高等学校科学技术研究指导项目(Z2015025)
中央高校基本科研业务费资助项目(Z2015025)
国家自然科学基金(50978237)
关键词
汶川地震
稳定性分析
安全系数
烈度异常
Wenchuan earthquake
stability analysis
factor of safety
intensity anomaly
