库水波动下堆积层滑坡稳定性研究

发布时间：2018-02-27 14:02

本文关键词： 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　出处：《水利学报》2017年04期 　论文类型：期刊论文

【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。
[Abstract]:The accumulation layer landslide is the most common type of geological hazard in the three Gorges Reservoir area. The stability of the landslide is significantly affected by the varying rate of reservoir water level. Taking the Liangshui well landslide in the three Gorges Reservoir area as an example, In this paper, the stability of four different saturated reservoir landslides with different saturation permeability coefficients (卤0.2, 卤0.4, 卤0.6, 卤0.8, 卤1.0, 卤1.2, 卤1.4, 卤1.6, 卤1.8 and 卤2.0 m-1 / d) at 10 different rates of saturation permeability coefficient were analyzed. Based on the above analysis, the stability of the three Gorges landslide with different saturated permeability coefficients during the process of rising and falling of reservoir water was put forward. Project of risk classification for water level regulation in reservoir area, It is considered that the rise and fall rate of reservoir water level is low risk, the middle risk is between 0.6 m / d and 0.8 m / d, and the risk is higher than 0.8 m / d. The safety coefficient curve obtained from the actual water level change of reservoir is combined with the classification method of geological hazard grade. The long-term risk process of Liangshui well landslide is shown intuitively. The research results have certain application value for landslide monitoring and warning and reservoir operation.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国地质科学院地质力学研究所;中国地质调查局地质环境监测院;
【基金】：十二五国家科技支撑重点项目(2012BAK10B01)
【分类号】：P642.22

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