摘要
在断层节理较为发育的岩石山体发生滑坡时,岩石块体是主要组成。岩石块体因具有较大的离散特征,相互间基本不具备黏性,所以容易发生滑移,尤其在地面振动的影响下更容易发生远距离的运移。文章介绍了一种在二维模型非连续变形分析方法(DDA)的基础上发展的三维模型,相比二维模型能够更好地描述滑坡介质的横向和纵向位移,可以界定整个滑坡的沉积区范围。模拟结果表明,加载地震波后块体滑坡运移距离显著提高,滑坡滑移区的最大横向距离也显著增加,而且滚动中的岩石更容易增加弹跳高度和距离。研究最后预测舟曲县局部敏感地区的岩石滑坡距离和沉积范围,并评价其危险程度。预测模拟结果表明,舟曲县附近山体的几个滑动面对县城的危险性较低,而靠近两河口中白龙江沿岸的几个滑坡面危险性较高。文章可为舟曲县周围的灾害点预判提供参考。
When a landslide occurs in a rock slope with well-developed fault joints,rock blocks are its main component.Because of their large discrete characteristics and lack of cohesion,rock blocks are prone to long-distance sliding,especially under the influence of seismic wave loading.In this respect,this study develops a three-dimensional model based on a two-dimensional discontinuous deformation analysis model.Compared with the 2D model,the proposed model can better describe the lateral and longitudinal displacements of landslide media and define the sedimentary area of an entire landslide.The simulation results showed that after loading seismic waves,the movement distance of the block landslide and the maximum lateral distance of the landslide sliding zone are both significantly increased.Moreover,the rolling rocks are more likely to increase their bounce height and distance under seismic wave loading.Finally,the distance and sedimentary range of rock landslides in local sensitive areas of the Zhouqu area are predicted,and their danger levels are evaluated.The predicted simulation results indicate that several sliding surfaces near Zhouqu County have low risks to the county,whereas those located near Lianghekou and along the bank of the Bailong River have high risks.This study can provide a reference for predicting disaster points around Zhouqu County.
作者
武震
张慧文
吴俭俭
陈安安
WU Zhen;ZHANG Huiwen;WU Jianjian;CHEN An'an(Lanzhou Institute of Seismology,CEA,Lanzhou 730000,Gansu,China;Gansu Lanzhou Geophysics National Observation and Research Station,Lanzhou 730000,Gansu,China;Provincial Key Laboratory of Desertification Combating,Gansu Desert Control Research Institute,Lanzhou 730070,Gansu,China;Postdoctoral Research Workstation,Gansu Desert Control Research Institute,Lanzhou 730070,Gansu,China)
出处
《地震工程学报》
北大核心
2025年第4期911-924,共14页
China Earthquake Engineering Journal
基金
中国地震局基本科研业务费(2020IESLZ04)
中国地震局星火计划(XH20019)
甘肃省自然科学基金(22JR5RA824)
甘肃省科技重大专项计划(21ZD4FA011)。
关键词
地震波加载
数值模拟
岩石滑坡
危险性评价
seismic wave loading
numerical simulation
rock landslide
hazard assessment
