丁国平, 胡成, 陈华丽, 陈刚, 李亮. 2012: 衡水地面沉降区黏性土体渗透特征研究. 工程地质学报, 20(1): 82-87.
    引用本文: 丁国平, 胡成, 陈华丽, 陈刚, 李亮. 2012: 衡水地面沉降区黏性土体渗透特征研究. 工程地质学报, 20(1): 82-87.
    DING Guoping, HU Cheng, CHEN Huali, CHEN Gang, LI Liang. 2012: PERMEABILITY CHARACTERISTICS OF CLAY IN LAND SUBSIDENCE CENTER AT HENGSHUI,HEBEI,CHINA. JOURNAL OF ENGINEERING GEOLOGY, 20(1): 82-87.
    Citation: DING Guoping, HU Cheng, CHEN Huali, CHEN Gang, LI Liang. 2012: PERMEABILITY CHARACTERISTICS OF CLAY IN LAND SUBSIDENCE CENTER AT HENGSHUI,HEBEI,CHINA. JOURNAL OF ENGINEERING GEOLOGY, 20(1): 82-87.

    衡水地面沉降区黏性土体渗透特征研究

    PERMEABILITY CHARACTERISTICS OF CLAY IN LAND SUBSIDENCE CENTER AT HENGSHUI,HEBEI,CHINA

    • 摘要: 弱透水层或(和)弱透水性夹层中低渗透性黏土体的存在是地面沉降赖以形成的物质基础,其渗透特征是影响地面沉降评价、模拟与预测的最基本参数之一。本文以华北平原衡水沉降中心区的钻孔黏性土样为对象,利用高压三轴渗透试验仪进行了土样的渗透试验。结果表明:黏性土体的渗透系数随土体埋深和渗透压力增加而呈现总体逐渐减小的趋势,在时间上总体表现为开始时迅速减小而后逐渐趋于稳定的特点,但是由于地下水位季节性波动或者地下水大量被抽取,部分地层黏土其渗透系数与总体趋势有所差异。最后文章结合电镜扫描试验及分形技术分析了土体微观结构对其渗透特征的控制作用。

       

      Abstract: The clay with low permeability in aquitard or/ and interbedded layer is the substance base of subsidence in the Huabei Plain,China.The seepage flow characteristics in clay can greatly impact the evaluation,simulation and prediction of the land subsidence.In this paper,soil samples are taken from the subsidence center at Hengshui and tested in laboratory.First,seepage tests are carried out by the high confining pressure triaxial seepage equipment.The test results indicate that the permeability of clay changes with the soil depth and the applied seepage pressure.The greater the soil depth and the seepage pressure are,the smaller the permeability is.Temporally,the permeability of the clay decreases rapidly at the beginning of the test.Then it stabilizes gradually.But due to the seasonally groundwater level fluctuations or excessive groundwater pumpage,the permeability values of some clay soil samples show different patterns.Finally,electron microscope scanning and fractal technology are used to analyze the control effect of microstructure of clay on the seepage flow characteristics.

       

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