延安Q3原状黄土渗透各向异性及微结构分析

doi:10.13278/j.cnki.jjuese.20180156

吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (5): 1389-1397.doi: 10.13278/j.cnki.jjuese.20180156

延安Q₃原状黄土渗透各向异性及微结构分析

洪勃^1,2, 李喜安¹, 王力^1,2, 李林翠¹

1. 长安大学地质工程与测绘学院, 西安 710054;
2. 陕西省地质调查院矿山地质灾害成灾机理与防控重点实验室, 西安 710054

收稿日期:2018-06-16 出版日期:2019-09-26 发布日期:2019-10-10
通讯作者: 李喜安(1968-),男,教授,博士生导师,主要从事黄土地质灾害方面的教学与科研工作,E-mail:dclixa@chd.edu.cn E-mail:dclixa@chd.edu.cn
作者简介:洪勃(1987-),男,博士研究生,主要从事黄土工程地质及其灾害防治研究,E-mail:hongbo@chd.edu.cn
基金资助:
国家自然科学基金项目（41877225，41572264）；中央高校基本科研业务费专项资金项目（300102268717）；矿山地质灾害成灾机理与防控重点实验室开放课题（KF2017-16，KF2017-17）

Permeability Anisotropy and Microstructure of Yan'an Q₃ Loess

Hong Bo^1,2, Li Xi'an¹, Wang Li^1,2, Li Lincui¹

1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China;
2. Key Laboratory of Mine Geological Hazards Mechanism and Control, Shaanxi Institute of Geological Survey, Xi'an 710054, China

Received:2018-06-16 Online:2019-09-26 Published:2019-10-10
Supported by:
Supported by National Natural Science Foundation of China (41877225, 41572264), Fundamental Research Funds for the Central Universities, CHD (300102268717), Opening Topics of Key Laboratory of Mine Geological Hazards Me-chanism and Control (KF2017-16,KF2017-17)

摘要/Abstract

摘要： 为研究原状马兰黄土的渗透各向异性，以延安削山造地重大工程开挖所揭露的完整黄土剖面中的马兰黄土层为研究对象，采用室内变水头渗透试验获取不同埋深不同渗流时长原状黄土垂直向和水平向的渗透系数，并对试验前后黄土试样垂直向和水平向SEM（scanning electron microscope）电镜扫描结果进行分析，从微观结构上揭示原状马兰黄土结构各向异性的原因。结果表明：原状黄土垂直向和水平向饱和渗透系数具有显著各向异性，且垂直向和水平向渗透系数都随渗流时间的持续而减小，各向异性渗透性能在时间尺度上具有某种衰减关系；同时，原状黄土各向异渗透性能随埋深的增大而逐渐减弱；土颗粒结构的接触、排列方式是导致黄土原生各向异性的根本原因，也是导致渗流初始阶段渗透系数各向异性的原因，而渗流作用产生的次生结构各向异性则使渗透系数各向异性在时间尺度上表现得更为明显。

关键词: 黄土, 渗透各向异性, 原生孔隙, 次生孔隙, 微观结构

Abstract: In order to study the anisotropic permeability of undisturbed loess, Yan'an Q₃ loess with obvious anisotropy was chosen as the research object. The vertical and horizontal permeability coefficients of different deep-buried undisturbed loess were measured by variable water head permeability tests in laboratory. The results showed that the vertical permeability coefficient of undisturbed loess was larger than the horizontal permeability coefficient of the same horizon. In addition, both vertical and horizontal permeability coefficients of undisturbed loess decreased with the increase of burial depth of loess, and the anisotropy of undisturbed loess was weakened as the burial depth increased, which indicates that anisotropic undisturbed loess gradually become isotropic with the increase of buried depth. Furthermore, in order to investigate the anisotropy of undisturbed loess from microstructure, the longitudinal and transversal sections of undisturbed loess in different buried depths were characterized by SEM (scanning electron microscopy). It was found that the contact and arrangement of soil particles are the fundamental factors resulting in the anisotropic loess.

Key words: loess, permeability anisotropy, primary porosity, induced porosity, microstructure

中图分类号:

P642.131

洪勃, 李喜安, 王力, 李林翠. 延安Q₃原状黄土渗透各向异性及微结构分析[J]. 吉林大学学报(地球科学版), 2019, 49(5): 1389-1397.

Hong Bo, Li Xi'an, Wang Li, Li Lincui. Permeability Anisotropy and Microstructure of Yan'an Q₃ Loess[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(5): 1389-1397.

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延安Q₃原状黄土渗透各向异性及微结构分析

Permeability Anisotropy and Microstructure of Yan'an Q₃ Loess

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