摘要
地震是引起边坡失稳的重要因素之一,文章以怒江上游干流左岸一边坡为例,利用Flac3D软件对其在地震工况下的稳定性进行了数值模拟分析。通过对比得出:在天然工况下,边坡塑性区域分布范围较小且零星,剪应变增量和位移场分布均合理分布,边坡处于稳定状态;在地震工况下,塑性区域形成贯通面,剪应力增量集中分布在基岩与变形带分界面,并且位移大幅增加,此时边坡处于失稳破坏状态。文章对揭示边坡在地震作用下失稳机制提供有益参考。
Earthquake is one of the prime reasons for slope failure. Based on the case of a large-scale deformable body located on upstream Nujiang River, the authors make the numerical simulation by use the software of Flac3D . Comparisons showed：the distribution of plastic zones under initial earth stress is sporadic, the distribution of shear strain zones and lateral displacement under initial earth stress is reasonable rational;Under seismic load, there arise the complete connection of the plastic zones of the slope. The shear strain distributes on the boundary of deformable area and pedestal rock and the displacement contour of horizontal direction arises, so the slope is thought to be instable under seismic load drastically. The results are helpful to further research on the mechanism of slope instability under earthquakes.
出处
《防灾科技学院学报》
2015年第1期47-52,共6页
Journal of Institute of Disaster Prevention
关键词
数值模拟
稳定性分析
地震
Flac3D
numerical simulation
Flac3D
stability analysis
earthquake
