泾河南塬黄土的渗透特征及孕灾机制

[目的]分析泾河南塬黄土的渗透各向异性特征,并探讨该地区滑坡的孕灾机制,以期为黄土分布区雨水入渗型滑坡的灾害防治提供指导。[方法]通过野外调查和渗透试验,分析该地区裂隙土以及不同土层的渗透特征。[结果]裂隙土的渗透系数远大于均质土,裂隙的存在为水的入渗提供优势渗流通道。不同土层渗透系数对比表明,马兰黄土因大、中孔隙多以及节理裂隙发育,其渗透系数最大,而古土壤的渗透系数最小。[结论]泾河南塬黄土具有明显的渗透各向异性,水与裂隙共同作用已成为该地区的一种恶性灾害链模式。

Infiltration Characteristics and Disaster-forming Mechanism of Loess in South Jinghe Tableland

[Objective] The characteristics of the permeability anisotropy of the South Jinghe tableland were analyzed, and the disaster-pregnant mechanism of landslides was discussed in order to provide guidance for disaster prevention and control of rainwater infiltration landslides in the loess distribution area.[Methods] Through field investigation and infiltration test, the infiltration characteristics of fractured soil and different soil layers in this area were analyzed.[Results] The permeability coefficient of fractured soil was much higher than that of homogeneous soil. Comparison of permeability coefficients of different soil layers showed that the permeability coefficient of Malan loess was the largest due to large and medium porosity and joint fracture development, while the permeability coefficient of the paleosol was the smallest.[Conclusion] The soil in South Jinghe tableland has significant permeability anisotropy. The mechanism of water-fissure disaster-forming has become a malignant disastrous chain model in this area.