滑坡体渗流场与库水位波动响应关系研究——以三峡库区李家坡滑坡为例  

Research on response relationship between seepage field in landslide and reservoir water level fluctuation: case of Lijiapo landslide in Three Gorges Reservoir area

作　　者：孙莹洁[1] 郭宁[1] 潘尚涛[1] 

机构地区：[1]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《人民长江》2014年第7期66-69,共4页Yangtze River

基　　金：中国地质调查局库水波动下地下水孔隙水变化实时监测与地质灾害预测评价(1212010814012)

摘　　要：以三峡库区李家坡滑坡为研究对象,在滑坡体下部建立了集孔隙水压力、水分含量于一体的实时监测系统,依托采集的长期连续观测数据,开展库水位升降过程中滑坡体地下水渗流场的变化规律研究。结果表明,库水位上升过程中,滑坡体内孔隙水压力的变化趋势与库水位保持一致但相对滞后,滞后时间最长达19 h;库水位下降过程中孔隙水压力的变化趋势与库水位上升时近似,但由于地下水回流影响滞后时间相对较长,最长达到32 h。库水位升降过程中水分含量实时监测数据及变化曲线能较好反映滑坡体含水量的响应规律,此规律若与孔隙水压力相结合,可较好地分析滑坡体地下水渗流场的变化过程,为后续滑坡的模型建设及稳定性评价提供可靠的数据支持,同时为同类型滑坡的研究提供借鉴。In view of Lijiapo landslide in Three Gorges Reservoir area, a real-time monitoring system composed of pore water pressure and water content is constructed in the lower part of landslide. Based on the long-term and continuous monitoring data, the variation law of groundwater seepage field in the landslide mass with the reservoir water level fluctuation is studied. The re-sults show that the variation trend of the pore water pressure in the landslide mass is consistent with that of reservoir water level when water level rising, but relatively lags behind and the maximum lagging time is up to 19 h; the variation law of pore water pressure is similar with the rise of water level when the reservoir water level drops, the lagging time is much longer because of groundwater reflow and the maximum lagging time reaches 32 h. The real-time monitoring data and variation curve of water con-tent can well reflect the response law of landslide water content and in the combination with the pore water pressure, the evolution of groundwater seepage field in the landslide can be better analyzed to provide reliable data for numerical simulation and stability evaluation of the landslide.

关 键 词：库水位升降 滑坡体 渗流场 响应关系 三峡库区 

分 类 号：P642.22[天文地球—工程地质学]