摘要
三峡库区城市建设往往由于特殊的工程地质条件叠加降雨影响,导致边坡失稳。以重庆市巫山县江东新区金鸡岭滑坡为例,通过分析多年地表位移监测数据,得出滑坡变形特征,利用有限元软件,采用渗流-应力耦合计算方法分析在排水工程作用下边坡渗流特征,通过强度折减法,探究地下水位变化对的边坡稳定性的影响。研究结果表明:金鸡岭滑坡的变形程度与降雨并无直接关联,只有连续、集中的降雨引起地下水位升高才会使金鸡岭滑坡产生明显变形。随着排水时间的增加导致地下水位逐渐降低,坡体内孔隙水压力逐渐减少,坡体位移变形面积、最大位移量降低,稳定性系数逐渐提高,但稳定性系数的增长幅度呈现下降趋势。研究成果验证了地下水渗流是控制金鸡岭滑坡变形的主要驱动力,排水措施的防治效果显著,滑坡现已处于稳定状态,也证实在富水边坡中实施地下排水隧洞措施是有效的,对类似边坡的防灾治理可提供借鉴。
In the Three Gorges reservoir area,the slope instability is often caused by the special engineering geological conditions and the influence of rainfall.Taking Jinjiling landslide in Jiangdong New District,Wushan County,Chongqing as an example,the characteristics of landslide deformation were obtained through the analysis of surface displacement monitoring data for many years.The seepage and stress coupling calculation method was used to analyze the seepage characteristics of slope under the action of drainage engineering by using finite element software.The results show that the deformation degree of Jinjiling landslide is not directly related to rainfall,and only the continuous and concentrated rainfall can cause the rise of groundwater level to produce obvious deformation of Jinjiling landslide.With the increase of drainage time,the groundwater level gradually decreases,the pore water pressure in the slope body gradually decreases,the displacement deformation area and the maximum displacement of the slope body decrease,and the stability coefficient gradually increases,but the growth range of the stability coefficient shows a downward trend.The research results verify that groundwater seepage is the main driving force to control the landslide deformation in Jinjiling,and the drainage measures have a remarkable effect on prevention and control,and the landslide is now in a stable state.It also confirms that the implementation of underground drainage tunnel measures in the water-rich slope is effective,and can provide reference for the disaster prevention and control of similar slopes.
作者
张子盼
张枝华
黄波林
秦盼盼
董星辰
ZHANG Zi-pan;ZHANG Zhi-hua;HUANG Bo-lin;QIN Pan-pan;DONG Xing-chen(College of Civil Engineering&Architecture,China Three Gorges University,Yichang 443002,China;Chongqing Geological Exploration Bureau 208 Hydrogeology Engineering Geology Team,Chongqing 400700,China;Hubei Key Laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang 443002,China)
出处
《科学技术与工程》
北大核心
2025年第23期9725-9733,共9页
Science Technology and Engineering
基金
国家自然科学基金(U23A2045)
重庆市巫山县科技局科技项目(wskjxm)
重庆市地矿局开放基金(208-KC-202310)。
关键词
边坡稳定性
地下水渗流
排水效果
数值模拟
slope stability
groundwater seepage
drainage effect
numerical simulation
作者简介
第一作者:张子盼(2000-),男,汉族,湖北宜昌人,硕士研究生。研究方向:地质灾害研究与防治。E-mail:1773275468@qq.com;通信作者:张枝华(1980-),男,汉族,四川宜宾人,博士,高级工程师,硕士研究生导师。研究方向:地质灾害研究与防治。E-mail:471316266@qq.com。
