Intrusive granite dykes and their weathered layers can have great effects on seepage into slopes and on their stability. However, few studies of this topic have been reported. Using the Zhonglincun landslide as an example, we investigate the impact of a dyke and its weathered layer on the formation mechanism of a rainfall-induced residual soil slope failure. The sliding mass of Zhonglincun landslide is mainly composed of residual soils of both tuff and an intrusive granite dyke. We used laboratory soil column tests to obtain rainfall infiltration characteristics of the two residual soils. The SEEP/W mode of Geo-studio software was then used to replicate the above soil column tests to back-analyze unsaturated hydraulic parameters of the two soils, which were later used to simulate seepage fields and stress-strain fields of the slope under Typhoon Tailim. The results indicate that the movement of rainwater in the residual soil of the granite dyke is much faster than that of the residual soil of the tuff. Rainwater infiltrates rapidly into the granite soil, and then flows laterally into the tuff residual soil, raising the groundwater table in the slope, especially near the contact between the two residual soils. This leads to a rapid increase in pore-water pressure and initiates the serious deformation of the landslide. The granite dyke and its residual soil have played a key role in the formation of Zhonglincun landslide.

侵入性花岗岩堤及其风化层可能对渗入斜坡及其稳定性有很大影响。但是，有关该主题的研究很少。以中林村滑坡为例，研究了堤坝及其风化层对降雨引起的残余土坡破坏的形成机理的影响。中林村滑坡的滑移质主要由凝灰岩的残余土和侵入性花岗岩堤构成。我们使用实验室土壤柱测试来获得两种残留土壤的降雨入渗特征。然后，使用Geo-studio软件的SEEP / W模式来复制上述土柱测试，以反分析两种土的非饱和水力参数，后来被用来模拟台风台林下边坡的渗流场和应力应变场。结果表明，花岗岩堤坝残余土壤中雨水的运动比凝灰岩残余土壤中雨水的运动快得多。雨水迅速渗入花岗岩土壤，然后横向流入凝灰岩残留土壤，从而提高了斜坡中的地下水位，特别是在两种残留土壤之间的接触附近。这导致孔隙水压力迅速增加，并引发了滑坡的严重变形。花岗岩堤及其残余土壤在中林村滑坡形成中起着关键作用。雨水迅速渗入花岗岩土壤，然后横向流入凝灰岩残留土壤，从而提高了斜坡中的地下水位，特别是在两种残留土壤之间的接触附近。这导致孔隙水压力迅速增加，并引发了滑坡的严重变形。花岗岩堤及其残余土壤在中林村滑坡形成中起着关键作用。雨水迅速渗入花岗岩土壤，然后横向流入凝灰岩残留土壤，从而提高了斜坡中的地下水位，特别是在两种残留土壤之间的接触附近。这导致孔隙水压力迅速增加，并引发了滑坡的严重变形。花岗岩堤及其残余土壤在中林村滑坡形成中起着关键作用。