摘要
为探讨金沙江乌东德水电站坝址金坪子滑坡Ⅱ区排水治理效果,在分析滑坡地质及变形监测资料基础上,建立滑坡地质力学模型,应用MIDAS-GTS及Geo-Slope软件,采用流固耦合作用的数值分析方法,分析对比实施排水工程前后的滑坡孔隙水压力及稳定性,对排水治理效果进行评价。研究表明,①滑坡变形破坏模式属典型松脱式,变形多集中于前缘,中部次之,后缘最小,且变形速率与降雨量呈线性正相关,最适宜采取排水措施进行工程治理。②排水治理后,在天然工况下,前缘最大正孔隙压力降低51.36%,后缘最大负孔隙压力提升39.36%;在降雨工况下,前缘最大正孔隙压力降低24.98%,后缘最大负孔隙压力提升63.06%,排水措施较大程度上改善了坡体内的孔隙水压力特征。③排水治理后,滑坡稳定性显著提高,天然状态下滑坡稳定性系数提升10%以上,降雨状态下提升35%以上。其研究成果可为类似滑坡工程治理提供借鉴。
In order to discuss the drainage treatment effect of Jinpingzi landslide area II at Wudongde Hydropower Station dam site of Jinsha River,establishing geomechanical model of landslide based on the analysis of landslide geology and deformation monitoring data,and using MIDAS-GTS and Geo-Slope software,the pore pressure and stability of landslide before and after the implementation of drainage engineering is analyzed and compared,and the effect of drainage treatment is evaluated.The research results show that:①the deformation and failure mode of landslide is typical loose type,the deformation is mainly concentrated in the front edge,followed by the middle part,and the rear edge is the smallest.Moreover,the deformation rate is positively correlated with rainfall,so it is most suitable to take drainage measures for engineering treatment.②After drainage treatment:under natural conditions,the maximum positive pore pressure of the front edge is reduced by 51.36%,and the maximum negative pore pressure of the trailing edge is increased by 39.36%;under the rainfall condition,the maximum positive pore pressure of the front edge is reduced by 24.98%,and the maximum negative pore pressure of the trailing edge is increased by 63.06%.The drainage measures greatly improve the pore water pressure characteristics in the slope body.③after drainage treatment,the stability of the landslide is significantly improved,the stability coefficient of the landslide increased by more than 10%in the natural state and 35%in the rainfall state.The research results of this paper have important reference significance for similar landslide engineering treatment.
作者
邓燕红
Deng Yanhong(E-XI Institute of Geo-engineering Survey and Explore,Yichang,Hubei 443002)
出处
《资源环境与工程》
2020年第4期586-593,共8页
Resources Environment & Engineering
关键词
滑坡
排水治理
流固耦合
数值模拟
极限平衡
landslide
drainage treatment
fluid solid coupling
numerical simulation
limit equilibrium
