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泾河南塬黄土的渗透特征及孕灾机制
洪勃1,2, 杜少少3, 李喜安2, 王力1,2, 王少林3, 张航泊3
1.矿山地质灾害成灾机理与防控重点实验室, 陕西 西安 710054;2.长安大学 地质工程与测绘学院, 陕西 西安 710054;3.陕西省地质调查中心, 陕西 西安 710054
摘要:
[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。
关键词:  黄土  黄土裂隙  渗透系数  优势渗流通道  孕灾机制
DOI:10.13961/j.cnki.stbctb.2019.03.013
分类号:P642.22;X43
基金项目:国家自然科学基金面上项目“基于三维微观结构的黄土湿陷性成因及潜蚀黄土场地湿陷机理研究”(41572264),“基于结构单元堆积理论的黄土湿陷性预测模型研究”(41877225);中央高校基本科研业务费专项资金“长安大学优秀博士学位论文培育”资助项目(300102268717);矿山地质灾害成灾机理与防控重点实验室开放课题资助课题(KF2017-16)(KF2017-17)。
Infiltration Characteristics and Disaster-forming Mechanism of Loess in South Jinghe Tableland
Hong Bo1,2, Du Shaoshao3, Li Xi'an2, Wang Li1,2, Wang Shaolin3, Zhang Hangbo3
1.Key Laboratory of Mine Geological Hazards Mechanism and Control, Xi'an, Shaanxi 710054, China;2.School of Geological Engineering and Geomatics, Chang'an University, Xi'an, Shaanxi 710054, China;3.Shaanxi Geological Survey Center, Xi'an, Shaanxi 710054, China
Abstract:
[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.
Key words:  loess  loessial fracture  permeability coefficient  preponderance flow path  disaster-forming mechanism