水位变动下三峡库区堆积层滑坡失稳机制研究  

Instability mechanism of accumulation landslide in Three Gorges Reservoir Area under water level fluctuation

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作  者:韦秉旭[1] 王起 周琰 张寒冰 WEI Bingxu;WANG Qi;ZHOU Yan;ZHANG Hanbing(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Guangxi Road Construction Engineering Group Co.,Ltd.,Nanning 530000,China)

机构地区:[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]广西路建工程集团有限公司,广西南宁530000

出  处:《交通科学与工程》2024年第6期66-73,共8页Journal of Transport Science and Engineering

基  金:湖南省自然科学基金项目(2018JJ2431)。

摘  要:库区堆积层滑坡失稳的地质灾害越来越得到广大学者的关注,水位变动是诱发滑坡失稳的重要原因之一。以三峡库区二道河滑坡为研究对象,基于非饱和流⁃固耦合数值方法,根据实际工程的水位波动情况设计了四种水位变动工况,运用仿真计算软件FLAC3D探讨库区滑坡的渗流特性、位移响应、塑性破坏及稳定性演变规律,并深入研究其失稳机制。研究结果表明:三峡库区二道河滑坡为典型的动水压力滞后型滑坡,水位上升期和低水位恒定期对滑坡有利,高水位恒定期和水位下降期对滑坡不利;随着水位的变动,安全系数的变化呈现出急剧增加、快速下降、急剧降低、缓慢回升四个阶段;水位快速下降会引起滑体部位产生位移突变,应重视滑坡前缘的防护及加固。研究成果可为堆积层滑坡失稳机制分析及滑坡治理提供科学依据。The geological hazards of landslide instability in the Three Gorges Reservoir Area are catching increasingly more attention from scholars.Water level changes are an important factor inducing landslide instability.By taking the Erdaohe Landslide in the Three Gorges Reservoir Area as the research object,based on the unsaturated fluid-solid coupling numerical method,four operation conditions for water level fluctuation were designed according to the water level fluctuation in the Three Gorges Reservoir Area.Meanwhile,the simulation computation software FLAC3D was adopted to discuss the seepage characteristics,displacement response,plastic failure,and stability evolution law of landslides in the reservoir area,with the landslide instability mechanism deeply explored.The results show that the research object of this paper is the typical hydrodynamic pressure lag type landslide,the water level rising period and the low water level constant period are favorable to the landslide,and the high water level constant period and the water level falling period are unfavorable for the landslide.Additionally,the safety factor change experiences four stages of increasing sharply,decreasing rapidly,decreasing dramatically,and slowly increasing with the water level variation.The rapid water level drop causes sudden displacement variation of the sliding body,and attention should be paid to the protection and reinforcement of the front edge of the landslide.The research results can provide a scientific basis for instability mechanism analysis of accumulation landslides and landslide control.

关 键 词:三峡库区 滑坡 水位变动 流⁃固耦合 失稳机制 

分 类 号:U414[交通运输工程—道路与铁道工程]

 

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