中文摘要：

第四系残坡积堆积（Q4^dl＋cl）土和滑坡堆积（Q4^del）土,其岩性变化较大且土体密实程度不同对其渗透性有较大影响,室内直接测试其渗透系数较困难。首先,在王正塝滑体上开展双环渗透试验,测得了不同位置的渗透系数;其次,利用滑带土土样,开展了增减湿循环条件下的土水特征曲线测试,将实验室测得的土水特征曲线离散点,采用3种经典的土-水特征曲线模型进行拟合;最后,根据van Genuchten拟合的土水特征曲线和饱和渗透系数,采用van Genuchten经验公式估算了其非饱和渗透系数。研究表明：该滑坡体土层的饱和渗透系数为1.15×10^-7-366×10^-7m/s,相差100倍的数量级,这主要是滑体不是均匀土体,入渗快的地方可能存在水的优势入渗通道的原因;对离散的试验数据采用3种模型拟合效果较好,这3种模型对该滑坡体非饱和土具有较好的实用性;相关研究成果可为王正塝滑坡非饱和非稳定渗透计算提供参数依据,并对同类型土体非饱和水力学参数的确定具有一定的借鉴意义。

英文摘要：

Quaternary talus residue accumulation soil（Qdl＋cl4）and landslide accumulation soil（Qdel4）have many changes in lithology and compaction.This leads to different permeability,and makes it difficult to conduct the direct test indoor.This study first measured the coefficient of permeability at different places through in-situ double-ring tests and then tested the soil-water characteristic curves using an undisturbed specimen,including both wetting and drying paths.The scattered points measured in the test were bestfitted using three famous models of soil water characteristic curves.Last,the unsaturated permeability coefficient was estimated according to van Genuchten soil water characteristic curve and the saturated permeability coefficient.Research shows that：permeability coefficients are 1.15×10-7~366×10-7 m/s,a difference as much as 100 times the number of level,because that sliding body is not uniform soil,and the fast infiltration places may be the water advantage of infiltration channel.The discrete experimental data are simulated with three famous soil water characteristic curves.The three models have good fitting effect.These three models have good practicability for the unsaturated soil in this area.Through these studies,the unsaturated hydraulic parameters are determined for the unsaturated seepage analysis of Wangzhengbang landslide,and the technique can be used as reference for similar soils.