Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 493-503.doi: 10.13278/j.cnki.jjuese.20170226

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Experiment on Pore Structures of Malan Loess at Different Buried Depth

Li Lincui1, Li Xi'an1,2, Hong Bo1, Wang Li1   

  1. 1. College of Geology Engineering & Geomatics, Chang'an University, Xi'an 710054, China;
    2. Open Research Laboratory of Geotechnical Engineering, Ministry of Land and Resources, Xi'an 710054, China
  • Received:2017-11-30 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Natural Science Foundation of China (41172255,41572264,41440044,41877225)

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Abstract: Loess samples were prepared using pore-filling method to observe and analyze their microstructures. The pore structures and the change with depth increase were analyzed by scanning electron microscope and digital image analysis system. The five samples belong to porous soil according to the void ratio or pore area ratio. The results indicate that the connectivity of loess pore decreased with depth increase gradually, the pore structure changed from unstable overhead macro pores or mesopores into stable small or micro mosaic pores,and quantitatively, the area of macro pores and mesopores decreased by 63.04%, while the area of small pores and micro pores increased by 40.57% and 22.47% respectively. By analyzing pore shapes, the area change of micro pores, small pores, mesopores and macro pores mentioned above was resulted from the area change of elongated or irregular pores. From the area point of view, in the micro pores, small pores, mesopores and macro pores, the elongated pores were dominant, and the number of all these four kinds of pores decreased in turn significantly. This is mainly determined by the number of round pores, indicating that the round pores are small.

Key words: Malan loess, scanning electron microscope, pore classification, pore size distribution, pore shape distribution

CLC Number: 

  • P642.13
[1] 洪宝宁,刘鑫.土体微细观结构理论与试验[M].北京:科学出版社,2010. Hong Baoning,Liu Xin.Theory and Experiment of Microstructure,Meso-Structure of Soils[M].Beijing:Science Press,2010.
[2] Muñoz-Castelblanco J A,Pereira J M,Delage P,et al.The Water Retention Properties of a Natural Unsaturated Loess from Northern France[J].Geotechnique,2012,62(2):95-106.
[3] Romero E,Gens A,Lloret A.Water Permeability,Water Retention and Microstructure of Unsaturated Compacted Boom Clay[J].Engineering Geology,1999,54(1/2):117-127.
[4] Romero E,Simms P H.Microstructure Investigation in Unsaturated Soils:A Review with Special Attention to Contribution of Mercury Intrusion Porosimetry and Environmental Scanning Electron Microscopy[J].Geotechnical and Geological Engineering,2008,26(6):705-727.
[5] Pagliai M,Vignozzi N,Pellegrini S.Soil Structure and the Effect of Management Practices[J]. Soil and Tillage Research,2004,79(2):131-143.
[6] Vanden Bygaart A J,Protz R,Tomlin A D.Changes in Pore Structure in a No-Till Chronosequence of Silt Loam Soils,Southern Ontario[J].Canadian Journal of Soil Science,1999,79(1):149-160.
[7] Cetin H.Soil-Particle and Pore Orientations During Consolidation of Cohesive Soils[J].Engineering Geology,2004,73(1/2):1-11.
[8] Messing I,Jarvis N J.Seasonal Variation in Field-Saturated Hydraulic Conductivity in Two Swelling Clay Soils in Sweden[J]. Journal of Soil Science,1990,41(2):229-237.
[9] 雷祥义.中国黄土的孔隙类型与湿陷性[J].中国科学:B辑,1987,17(12):1309-1316. Lei Xiangyi.Pore Type of Loess in China and Collapsibility[J].Science China:Series B,1987,17(12):1309-1316.
[10] 王常明,林容,陈多才,等.辽西黄土湿陷变形特性及湿陷后微观结构变化[J].吉林大学学报(地球科学版),2011,41(2):471-477. Wang Changming,Lin Rong,Chen Doucai,et al.Collapsibility Deformation Characteristic and Its Changes in Microstructure of Loess in West of Liaoning[J].Journal of Jilin University (Earth Science Edition), 2011,41(2):471-477.
[11] 赵景波,陈云.黄土的孔隙与湿陷性研究[J].工程地质学报,1994,2(2):76-82. Zhao Jingbo,Chen Yun.Study on Pores and Collapsibility of Loess[J].Journal of Engineering Geology, 1994,2(2):76-82.
[12] 陈开圣,沙爱民.压实黄土湿陷变形影响因素分析[J].中外公路,2009,29(3):24-28. Chen Kaisheng,Sha Aimin.Analysis of Factors Influencing Collapse Deformation of Compacted Loess[J]. Journal of China & Foreign Highway,2009,29(3):24-28.
[13] 张泽,周泓,秦琦,等.冻融循环作用下黄土的孔隙特征试验[J].吉林大学学报(地球科学版), 2017,47(3):839-847. Zhang Ze,Zhou Hong,Qin Qi. Experimental Study on Porosity Characteristics of Loess Under Freezing-Thawing Cycle[J]. Journal of Jilin University (Earth Science Edition), 2017,47(3):839-847.
[14] 蔺如生.渭北黄土微结构、孔隙及导水性的分析[J].陕西水利,1990(2):43-47. Lin Rusheng.Analysis of Microstructure,Pore and Water Conductivity of Weibei Loess[J].Shaanxi Water Resources,1990(2):43-47.
[15] 李兰.黄土微结构的试验研究[J].水文地质工程地质,2004(3):17-19. Li Lan.Study on Microstructure of Loess[J].Hydrogeology and Engineering Geology,2004(3):17-19.
[16] 李兰,王兰民,王峻.永登5.8级地震极震区黄土微结构孔隙性的定量研究[J].地震研究,2005,28(3):283-287. Li Lan,Wang Lanmin,Wang Jun.Quantitative Research on the Porosity of Loess in the Meizoseismal Area of the Yongdeng M 5.8 Earthquake[J].Journal of Seismological Research, 2005,28(3):283-287.
[17] 李兰,王兰民,刘旭.极震区黄土微结构的试验研究[J].中国地震,2005,21(3):369-377. Li Lan,Wang Lanmin,Liu Xu.Research on Loess Micro-Structure in the Magistoseismic Area[J].Earthquake Research in China,2005,21(3):369-377.
[18] 王永焱,林在贯.中国黄土的结构特征及物理力学性质[M].北京:科学出版社,1990. Wang Yongyan,Lin Zaiguan.The Structure and Physical Mechanics of Loess in China[M].Beijing:Science Press,1990.
[19] 吴义祥.工程黏性土微观结构的定量评价[J].中国地质科学院院报,1991,2(4):143-151. Wu Yixiang.Quantitative Approach on Micro-Structure of Engineering Clay[J].Journal of the Chinese Academy of Geological Sciences,1991,2(4):143-151.
[20] Pires L F,Cooper M,Cássaro F A M,et al.Micromor-phological Analysis to Characterize Structure Modifications of Soil Samples Submitted to Wetting and Drying Cycles[J]. Catena,2008,72(2):297-304.
[21] Vanden Bygaart A J,Protz R,Tomlin A D. Changes in Pore Structure in a No-till Chronosequence of Silt Lam Soils,Southern Ontario[J]. Canadian Journal of Soil Science,1999,79(1):149-160.
[22] Sveistrup T E,Haraldsen T K,Langohr R,et al.Impact of Land Use and Seasonal Freezing on Morphological and Physical Properties of Silty Norwegian Soils[J]. Soil & Tillage Research,2005,81(1):39-56.
[23] Fener M,Yesiller N. Vertical Pore Structure Profile of a Compacted Clayey Soil[J]. Engineering Geolo-gy,2013,166:204-215.
[24] 王梅,白晓红,杨晶.湿陷性黄土微观结构分析的试样制备[J].太原理工大学学报,2009,41(3):283-286. Wang Mei,Bai Xiaohong,Yang Jing.Method of Specimen Preparation for Collapsible Loess Microstructure Research[J].Journal of Taiyuan University of Technology,2009,41(3):283-286.
[25] Nie Baisheng,Liu Xianfeng,Yang Longlong,et al.Pore Structure Characterization of Different Rank Coals Using Gas Adsorption and Scanning Electron Microscopy[J]. Fuel,2015,158:908-917.
[26] Rasa K,Eickhorst T,Tippkötter R,et al.Structure and Pore System in Differently Managed Clayey Surface Soil as Described by Micromorphology and Image Analysis[J].Geoderma,2012,173/174:10-18.
[27] Klaver J,Desbois G,Littke R,et al.BIB-SEM Characterization of Pore Space Morphology and Distribution in Postmature to Overmature Samples from the Haynesville and Bossier Shales[J].Marine and Petroleum Geology,2015,59:451-466.
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