摘要
雅安地震引发吴家山地区老滑坡体发生失稳现象,安置GPS监测系统对该地区进行了变形监测。在区域地质条件基础上,运用极限平衡法分析坡体稳定性;利用FLAC3D三维显式有限差分程序建立模型,输入地震波分析地震作用下坡体的变形情况,并结合实际GPS监测结果,探讨变形规律。稳定性分析表明地震作用导致边坡稳定性大幅下降,引起了此次边坡变形失稳;同一地震作用下不同土层的动响应程度不同,老滑坡体对地震作用更加敏感;数值模拟结果揭示了地震作用下坡体的变形情况,与实际监测结果进行了对比分析,对研究坡体变形有借鉴意义。
The Wujiashan old landslide was re-activated in the Ya＇an earthquake. The deformation of the landslide is monitored by a GPS monitoring system. The slope stability is analyzed with limit equilibrium method based on the regional geological conditions. The deformation under earthquake is analyzed inputting seismic wave based on a three-dimensional explicit finite difference model using FLAC3D. The deformation rule is discussed incorporation with the actual deformation obtained by GPS monitoring system. The results show that the slope stability safety is decreased greatly under earthquake which caused the slope failure; dynamic response degree in different soil layers is different under the same earthquake magnitude that the old landslides are more sensitive. The numerical results present the slope deformation under earthquake, comparing with actual results, which could be a reference for the deformation study.
出处
《工程勘察》
2014年第6期34-38,共5页
Geotechnical Investigation & Surveying
