库水波动下堆积层滑坡稳定性研究  

Research on the colluvial landslide stability during reservoir water level fluctuation

作　　者：赵瑞欣[1,2] 殷跃平[3] 李滨[2] 王文沛[3] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质科学院地质力学研究所,北京100081 [3]中国地质调查局地质环境监测院,北京100081

出　　处：《水利学报》2017年第4期435-445,共11页Journal of Hydraulic Engineering

基　　金：十二五国家科技支撑重点项目(2012BAK10B01)

摘　　要：堆积层滑坡是三峡库区中最常见的地质灾害类型。库水位的不同变化速率对滑坡稳定性影响显著。以三峡库区凉水井滑坡为例,分析了±0.2、±0.4、±0.6、±0.8、±1.0、±1.2、±1.4、±1.6、±1.8和±2.0 m/d 10种速率下,0.01、0.1、1和10 m/d 4种不同饱和渗透系数的堆积层滑坡在库水上升和下降过程中的稳定性变化规律。在此基础上提出了针对堆积层滑坡的三峡库区水位调度风险等级划分方案,认为库水位升降速率小于0.6 m/d为低风险,在0.6 m/d与0.8 m/d之间为中风险,大于0.8 m/d为高风险。利用实际库水位变动获得的安全系数曲线结合地质灾害等级划分方法,直观地显示了凉水井滑坡长期风险过程。研究结果对于滑坡的监测预警和水库调度具有一定的应用价值。Colluvial landslide is a very common geological disaster in the Three Gorges Reservoir Area.Changes of water level in different rate significantly influence on landslide stability. Taking the Liangshui-jing landslide as an example, the stability of the colluvial landslide were analyzed with ten rates between0.2 to 2.0 m/day and four different saturated permeability coefficients of colluvial landslide in the processof water rise and drawdown in the reservoir. Based on which, the risk grading scheme of the water levelregulation was put forward for the colluvial landslide in the Three Gorges reservoir area,taking v〈 0.6 m/day as a lower risk, and 0.6 m/day〈 v〈 0.8 m/day as a medium risks, and v〉 0.8 m/day as a highrisk. Using the safety coefficient curve calculated under the real fluctuation of water level in the reservoirand the method combined with the geological disaster hierarchies, the long-term risk of landslide processcurve was shown intuitively. The results have certain application values for landslide monitoring and warn-ing and reservoir scheduling in Three Gorges Reservoir Area.

关 键 词：三峡库区 堆积层滑坡 库水位变化 渗透系数 稳定性分析 成灾风险 

分 类 号：TV697.3[水利工程—水利水电工程]