«上一篇/Previous Article|本期目录/Table of Contents|下一篇/Next Article»

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第44卷

期数:

2022年第04期

页码:

581-592

栏目:

工程地质与环境灾害

出版日期:

2022-07-15

文章信息/Info

Title:

Characteristics of Microstructure and Collapsible Mechanism of Malan Loess in Loess Plateau, China

文章编号:

1672-6561(2022)04-0581-12

作者:

魏亚妮¹; 范 文¹; 2*; 麻广林¹

(1. 长安大学 地质工程与测绘学院,陕西 西安 710054; 2. 信息产业部电子综合勘察研究院,陕西 西安 710054)

Author(s):

WEI Ya-ni¹;  FAN Wen¹; 2*;  MA Guang-lin¹

(1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 2. China Electronic Research Institute of Engineering Investigations and Design, Xi'an 710054, Shaanxi, China)

关键词:

马兰黄土;  湿陷性;  微结构;  孔隙分布;  黏粒;  湿陷机理;  CT扫描;  黄土高原

Keywords:

Malan loess;  collapsibility;  microstructure;  pore size distribution;  clay particle;  collapsible mechanism;  CT scanning;  Loess Plateau

分类号:

P642.13⁺1

DOI:

10.19814/j.jese.2022.03047

文献标志码:

A

摘要:

黄土微结构的认识和刻画在研究黄土宏观湿陷变形行为以及揭示其内在机理方面扮演不可或缺的角色。选取黄土高原甘肃兰州、庆阳以及陕西横山、洛川、泾阳等5个地区马兰黄土试样,通过开展室内湿陷试验、微米级CT扫描以及压汞测试,厘清不同地区马兰黄土的微结构特征,分析对比湿陷过程中孔隙分布的变化规律,以此探讨马兰黄土的湿陷机理。结果表明:5个地区马兰黄土湿陷性在区域上整体表现为从西北向东南逐渐减弱的趋势; 兰州和横山地区马兰黄土的微结构以单粒架空/镶嵌为主,前者颗粒排列疏松,后者排列相对密实; 庆阳、洛川和泾阳地区马兰黄土中黏粒支托结构相对明显; 黄土湿陷过程中,孔径在3～60 μm区间的粒间孔隙体积减小幅度最大,为湿陷提供主要空间。5组黄土微结构特征及湿陷前后孔隙分布变化表明,黄土湿陷与否取决于两方面因素:一是黄土内部需有发生湿陷的空间,孔隙分布特征对湿陷性强弱有重要影响,集中分布的粒间孔隙有利于湿陷发生; 二是需有能够引起湿陷的动力因素,桥接形式的黏粒发生水化膨胀是引起颗粒滑移进而发生湿陷的重要动力之一。

Abstract:

Characterization of loess microstructure plays an important role in the research of collapse behavior and mechanism. Laboratory collapse tests, micro X-ray CT scanning and mercury intrusion porosimetry were conducted on Malan loess located in Lanzhou and Qingyang areas of Gansu, and Hengshan, Luochuan and Jingyang areas of Shaanxi, to characterize their microstructure, analyze the collapse differences and variations, and finally discuss collapse mechanism. The results show that Malan loess collapsibility decreases from northwest to southeast in Loess Plateau. Malan loess in Lanzhou and Hengshan areas both show interlocking and overhead structures with inter-particle pores, while the particles packing is loose in the former and dense in the latter. Clays buttress of loess is apparent in Qingyang, Luochuan and Jingyang areas, which determines the distribution of intra-particle pores. In the process of collapse, the pores in the diameters of 3 to 60 μm present significant decrease in volume, which provide main space for loess collapse. Microstructures and pore size distribution variations of five samples of loess collected from Lanzhou, Qingyang, Hengshan, Luochuan and Jingyang areas, indicate that two factors determine loess collapse. One is that there is sufficient space in loess provided for collapse, pore size distribution has important influence on the collapsible degree, the loess with intensive inter-particle pores is most likely to collapse; the another is that there are forces in loess which can induce collapse, hydration swelling of clay bridge between particles can be considered as an important inducement for collapse.

参考文献/References:

[1] 吕龙龙,廖红建,伏映鹏,等.基于应变能密度映射的黄土结构性参数研究[J].岩石力学与工程学报,2022,41(2):399-411.
LU Long-long,LIAO Hong-jian,FU Ying-peng,et al.Study on Structural Parameter of Loess Based on the Mapping of the Strain Energy Density[J].Chinese Journal of Rock Mechanics and Engineering,2022,41(2):399-411.
[2] 陈存礼,胡再强,高 鹏.原状黄土的结构性及其与变形特性关系研究[J].岩土力学,2006,27(11):1891-1896.
CHEN Cun-li,HU Zai-qiang,GAO Peng.Research on Relationship Between Structure and Deformation Property of Intact Loess[J].Rock and Soil Mecha-nics,2006,27(11):1891-1896.
[3] 朱兴华,彭建兵,同 宵,等.黄土地区地质灾害链研究初探[J].工程地质学报,2017,25(1):117-122.
ZHU Xing-hua,PENG Jian-bing,TONG Xiao,et al.Preliminary Research on Geological Disaster Chains in Loess Area[J].Journal of Engineering Geology,2017,25(1):117-122.
[4] 孙萍萍,张茂省,程秀娟,等.黄土高原地质灾害发生规律[J].山地学报,2019,37(5):737-746.
SUN Ping-ping,ZHANG Mao-sheng,CHENG Xiu-juan,et al.On the Regularity of Geological Hazards on the Loess Plateau in China[J].Mountain Research,2019,37(5):737-746.
[5] 胡志平,温 馨,张 勋,等.湿陷性黄土地区海绵城市建设研究进展[J].地球科学与环境学报,2021,43(2):376-388.
HU Zhi-ping,WEN Xin,ZHANG Xun,et al.Review on Sponge City Construction in Collapsible Loess Area[J].Journal of Earth Sciences and Environment,2021,43(2):376-388.
[6] OSIPOV V I,SOKOLOV V N.Factors and Mechanism of Loess Collapsibility[M]∥DERBYSHIRE E,DIJKSTRA T,SMALLEY I J.Genesis and Properties of Collapsible Soils.Loughborough:Springer,1994:49-64.
[7] 范 文,魏亚妮,于 渤,等.黄土湿陷微观机理研究现状及发展趋势[J].水文地质工程地质,2022,http:∥kns.cnki.net/kcms/detail/11.2202.P.20220525.1943.002.html.
FAN Wen,WEI Ya-ni,YU Bo,et al.Research Progress and Prospect of Loess Collapsible Mechanism in Micro-level[J].Hydrogeology and Engineering Geology,2022,http:∥kns.cnki.net/kcms/detail/11.2202.P.20220525.1943.002.html.
[8] 谢婉丽,王延寿,马中豪,等.黄土湿陷机理研究现状与发展趋势[J].现代地质,2015,29(2):397-407.
XIE Wan-li,WANG Yan-shou,MA Zhong-hao,et al.Research Status and Prospect of Loess Collapsibility Mechanism[J].Geoscience,2015,29(2):397-407.
[9] 范 文,邓龙胜,于 渤,等.黄土三维微结构[M].北京:科学出版社,2022.
FAN Wen,DENG Long-sheng,YU Bo,et al.Three-dimensional Microstructure of Loess[M].Beijing:Science Press,2022.
[10] 高国瑞.中国黄土的微结构[J].科学通报,1980,25(20):945-948.
GAO Guo-rui.Microstructure of Loess in China[J].Chinese Science Bulletin,1980,25(20):945-948.
[11] 雷祥义.中国黄土的孔隙类型与湿陷性[J].中国科学:B辑,1987(12):1309-1318.
LEI Xiang-yi.Classification of Loess Pores in Relation to Collapsibility[J].Science in China:Series B,1987(12):1309-1318.
[12] ROGERS C D F.Types and Distribution of Collapsible Soils[M]∥DERBYSHIRE E,DIJKSTRA T,SMALLEY I J.Genesis and Properties of Collapsible Soils.Loughborough:Springer,1994:1-17.
[13] 李晓军,张登良.CT技术在土体结构性分析中的应用初探[J].岩土力学,1999,20(2):62-66.
LI Xiao-jun,ZHANG Deng-liang.Application of CT in Analysis of Structure of Compacted Soil[J].Rock and Soil Mechanics,1999,20(2):62-66.
[14] 胡瑞林,官国琳,李向全,等.黄土湿陷性的微结构效应[J].工程地质学报,1999,7(2):161-167.
HU Rui-lin,GUAN Guo-lin,LI Xiang-quan,et al.Microstructure Effect on the Subsidence of Loess[J].Journal of Engineering Geology,1999,7(2):161-167.
[15] WANG M,BAI X,FROST J D.Influence of Initial Water Content on the Collapsibility of Loess[M]∥HOYOS L R,ZHANG X,PUPPALA A J.Experimental and Applied Modeling of Unsaturated Soils.Shanghai:ASCE Press,2010:60-68.
[16] 徐 璐,孙永福,刘绍文,等.基于GIS实现湿陷作用对海岸带黄土微结构的影响研究[J].海洋科学进展,2018,36(3):423-434.
XU Lu,SUN Yong-fu,LIU Shao-wen,et al.Study on the Influence of Collapsibility on Coastal Loess Microstructure by GIS[J].Advances in Marine Science,2018,36(3):423-434.
[17] 高 英,马艳霞,张吾渝,等.西宁地区黄土增湿变形特性及微观结构分析[J].工程地质学报,2019,27(4):803-810.
GAO Ying,MA Yan-xia,ZHANG Wu-yu,et al.Analysis of Humidifying Deformation Characteristics and Microstructure of Loess in Xining Area[J].Journal of Engineering Geology,2019,27(4):803-810.
[18] LIU Z,LIU F Y,MA F L,et al.Collapsibility,Composition,and Microstructure of Loess in China[J].Canadian Geotechnical Journal,2016,53(4):673-686.
[19] LI P,XIE W L,PAK R Y S,et al.Microstructural Evolution of Loess Soils from the Loess Plateau of China[J].Catena,2019,173:276-288.
[20] LI X A,LI L C,SONG Y X,et al.Characterization of the Mechanisms Underlying Loess Collapsibility for Land-creation Project in Shaanxi Province,China:A Study from a Micro Perspective[J].Engineering Geo-logy,2019,249:77-88.
[21] WEI T T,FAN W,YU N Y,et al.Three-dimensional Microstructure Characterization of Loess Based on a Serial Sectioning Technique[J].Engineering Geology,2019,261:105265.
[22] DENG L S,FAN W,LIU S P,et al.Quantitative Research and Characterization of the Loess Microstructure in the Bailu Tableland,Shaanxi Province,China[J].Advances in Civil Engineering,2020,2020:3681382.
[23] WEI Y N,FAN W,YU B,et al.Characterization and Evolution of Three-dimensional Microstructure of Malan Loess[J].Catena,2020,192:104585.
[24] YU B,FAN W,FAN J H,et al.X-ray Micro-computed Tomography(μ-CT)for 3D Characterization of Particle Kinematics Representing Water-induced Loe-ss Micro-fabric Collapse[J].Engineering Geology,2020,279:105895.
[25] YU B,FAN W,DIJKSTRA T A,et al.Heterogeneous Evolution of Pore Structure During Loess Collapse:Insights from X-ray Micro-computed Tomography[J].Catena,2021,201:105206.
[26] HOU K,QIAN H,ZHANG Y T,et al.Relationship Between Fractal Characteristics of Grain-size and Physical Properties:Insights from a Typical Loess Profile of the Loess Plateau[J].Catena,2021,207:105653.
[27] 崔 强,段辉顺,毛 矛,等.不同气候环境下黄土胶结性状的试验研究[J].地下空间与工程学报,2019,15(1):52-59.
CUI Qiang,DUAN Hui-shun,MAO Mao.Experimental Investigation of Cementing Property in Loess Under Different Climate Environment Conditions[J].Chinese Journal of Underground Space and Engineering,2019,15(1):52-59.
[28] 王永焱,滕志宏.中国黄土的微结构及其在时代上和区域上的变化[J].科学通报,1982,27(2):102-105.
WANG Yong-yan,TENG Zhi-hong.Microstructure of Loess in China and Its Variation in Times and Region[J].Chinese Science Bulletin,1982,27(2):102-105.
[29] 郑晏武.中国黄土的湿陷性[M].北京:地质出版社,1982.
ZHENG Yan-wu.Collapsibility of Loess in China[M].Beijing:Geological Publishing House,1982.
[30] 孙建中.黄土学(上篇)[R].香港:香港考古学会,2005.
SUN Jian-zhong.Loessology(Volume Ⅰ)[R].Hong Kong:Hong Kong Archaeological Society,2005.
[31] 雷祥义.黄土显微结构类型与物理力学性质指标之间的关系[J].地质学报,1989,63(2):182-191.
LEI Xiang-yi.The Relationship Between the Microfabric Types and the Indices of Physico-mechanical Properties in Loess of China[J].Acta Geologica Sinica,1989,63(2):182-191.
[32] DENG L S,FAN W,CHANG Y P,et al.Microstructure Quantification,Characterization,and Regional Variation in the Malan Loess on the Loess Plateau in China[J].International Journal of Geomechanics,2021,21(8):04021143.
[33] WANG J D,LI P,MA Y,et al.Change in Pore-size Distribution of Collapsible Loess Due to Loading and Inundating[J].Acta Geotechnica,2020,15:1081-1094.
[34] 罗 浩,伍法权,常金源,等.马兰黄土孔隙结构特征:以赵家岸地区黄土为例[J].工程地质学报,2021,29(5):1366-1372.
LUO Hao,WU Fa-quan,CHANG Jin-yuan,et al.Pore Characteristics of Malan Loess:A Case Study at Zhaojia'an Landslide[J].Journal of Engineering Geo-logy,2021,29(5):1366-1372.
[35] 李同录,张 辉,李 萍,等.不同沉积环境下马兰黄土孔隙分布与土水特征的模式分析[J].水文地质工程地质,2020,47(3):107-114.
LI Tong-lu,ZHANG Hui,LI Ping,et al.Mode Analysis of Pore Distribution and Soil-water Characteristic Curve of Malan Loess Under Different Depositional Environments[J].Hydrogeology and Engineering Geology,2020,47(3):107-114.
[36] 孙建中,王兰民,门玉明,等.黄土学(中篇)[M].西安:西安地图出版社,2013.
SUN Jian-zhong,WANG Lan-min,MEN Yu-ming,et al.Loessology(Volume Ⅱ)[M].Xi'an:Xi'an Cartographic Publishing House,2013.
[37] DERBYSHIRE E,MELLORS T W.Geological and Geotechnical Characteristics of Some Loess and Loessic Soils from China and Britain:A Comparison[J].Engineering Geology,1988,25(2/3/4):135-175.
[38] KLUKANOVA A,SAJGALIK J.Changes in Loess Fabric Caused by Collapse:An Experimental Study[J].Quaternary International,1994,24:35-39.
[39] LI Y R,HE S D,DENG X H,et al.Characterization of Macropore Structure of Malan Loess in NW China Based on 3D Pipe Models Constructed by Using Computed Tomography Technology[J].Journal of Asian Earth Sciences,2018,154:271-279.
[40] LI X,LU Y D,ZHANG X Z,et al.Quantification of Macropores of Malan Loess and the Hydraulic Signi-ficance on Slope Stability by X-ray Computed Tomography[J].Environmental Earth Sciences,2019,78(16):522.
[41] WEI T T,FAN W,YUAN W N,et al.Three-dimensional Pore Network Characterization of Loess and Paleosol Stratigraphy from South Jingyang Plateau,China[J].Environmental Earth Sciences,2019,78(11):333.
[42] WEI Y N,FAN W,YU N Y,et al.Permeability of Loess from the South Jingyang Plateau Under Different Consolidation Pressures in Terms of the Three-dimensional Microstructure[J].Bulletin of Engineering Geology and the Environment,2020,79(16):4841-4857.
[43] YU B, FAN W,DIJKSTRA T A,et al.Pore Structure Evolution Due to Loess Collapse:A Comparative Study Using MIP and X-ray Micro-CT[J].Geoderma,2022,424:115955.
[44] DIJKSTRA T A,SMALLEY I J,ROGERSC D F.Particle Packing in Loess Deposits and the Problem of Structure Collapse and Hydroconsolidation[J].Engineering Geology,1995,40(1):49-64.
[45] ZHANG W P,SUN Y F,CHEN W W,et al.Collapsi-bility,Composition,and Microfabric of the Coastal Zone Loess Around the Bohai Sea,China[J].Engineering Geology,2019,257:105142.
[46] MELLORS T W.The Influence of the Clay Component in Loess on Collapse of the Soil Structure[M]∥DERBYSHIRE E,DIJKSTRA T,SMALLEY I J.Genesis and Properties of Collapsible Soils.Loughborough:Springer,1994:207-216.
[47] YUAN Z X,WANG L M.Collapsibility and Seismic Settlement of Loess[J].Engineering Geology,2009,105:119-123.

相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2022-03-30; 修回日期:2022-05-23投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(42002285,41630634)
作者简介:魏亚妮(1986-),女,陕西兴平人,讲师,工学博士,E-mail:weiyani@chd.edu.cn。
*通讯作者:范 文(1967-),男,内蒙古武川人,长安大学教授,博士研究生导师,工学博士,E-mail:fanwen@chd.edu.cn。

常用功能

更新日期/Last Update: 2022-07-30