裂隙-黏土间水量交换率试验研究

发布时间：2018-06-12 03:03

本文选题：黏土 + 优势流　；参考：《哈尔滨工业大学学报》2017年08期

【摘要】：裂隙为污染物(或降雨)入渗提供了重要的优势通道,裂隙与土体之间的水量交换是裂隙中优势流的重要形式,通过水量交换率进行数学描述.而目前的研究主要针对砂土中的圆柱形裂隙,对于黏土中的平板形裂隙与黏土间水量交换率的研究目前处于空白.本研究针对黏土中裂隙的特点设计一套试验装置,通过含水量传感器和张力计等测量系统,定量研究裂隙-黏土间的水量交换率,并得到裂隙-黏土间的界面渗透系数.研究发现水量交换率在渗透初期最大,随着土中基质吸力的降低而降低,裂隙-黏土间的界面渗透系数比土体的饱和渗透系数大一个数量级.当土体的初始含水量不同时,随着渗透的进行,不同初始含水量土体中的水量交换率趋于一致,约为7×10~(-6)s~(-1).
[Abstract]:The water exchange between the fissure and the soil is an important form of the dominant flow in the fissure, which is described mathematically by the water exchange rate. However, the current research is mainly focused on the cylindrical fractures in sand, and the research on the water exchange rate between flat fractures and clay in clay is still blank. According to the characteristics of fracture in clay, a set of experimental device is designed in this paper. The water exchange rate between fracture and clay is quantitatively studied by measuring system such as water content sensor and tensometer, and the interfacial permeability coefficient between fracture and clay is obtained. It is found that the water exchange rate is the largest in the initial stage of infiltration and decreases with the decrease of the suction of the matrix in the soil. The interfacial permeability coefficient between the fissure and clay is one order of magnitude larger than the saturated permeability coefficient of the soil. When the initial water content of the soil is different, the water exchange rate in the soil with different initial water content tends to be the same, which is about 7 脳 10 ~ (-1) ~ (-1) ~ (-1).
【作者单位】：哈尔滨工业大学深圳研究生院;武汉大学水利水电学院;
【基金】：国家自然科学基金(51379053)
【分类号】：TU442

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