Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (S1): 237-244.doi: 10.16285/j.rsm.2021.1908

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Preliminary study on influencing factors and discrimination methods of dispersity of dispersive clay

LIU Jie1, 2, CUI Yu-yu1, 3, LU Zheng1, 2, YAO Hai-lin1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. Hubei Key Laboratory of Geo-Environmental Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-11-11 Revised:2022-01-05 Online:2022-06-30 Published:2022-07-14
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(42077261, 42077262, 41672312).

PDF (Chinese)

144

Abstract: The dispersity of dispersive clay in water is essential for the erosion and piping damage of dikes, channel slopes, and road slopes in dispersed land areas, and the discrimination of soil dispersion is prerequisite for engineering construction in dispersed land areas. In this paper, the tests such as pinhole test and crumb test are conducted to determine the dispersity of soil samples, then scanning electron microscope and X-ray diffraction are carried out to study the dispersion mechanism and microstructure of dispersive clay, and the primary and secondary influencing factors of soil dispersion are analyzed. Because of the strong linear relationship between the standard hygroscopic moisture content and the montmorillonite content of soil mineral composition, the distribution characteristics of montmorillonite content and pH value of typical dispersive clay are summarized by big data, a comprehensive discrimination method of soil dispersion based on the standard hygroscopic moisture content + pH value test is proposed, and the corresponding discrimination indices and discrimination procedures are given. Finally, it is verified with an engineering example. The results show that the existing environment with certain montmorillonite content and high pH value is the material basis and environmental guarantee for the dispersity of soil mass. If the requirements of montmorillonite content ≥ 10% and pH ≥ 8.5, the soil can be judged as dispersive clay; for soils out of this range, soil dispersity should be comprehensively judged in combination with the determination of dispersity of soil and field investigation results.

Key words: dispersive clay, dispersion mechanism, montmorillonite, standard hygroscopic moisture content, pH value

CLC Number: 

  • TU 411.2
[1] JI Sheng-ge, WANG Bao-zhong, YANG Xiu-juan, FAN Heng-hui. Experimental study of dispersive clay modified by calcium lignosulfonate [J]. Rock and Soil Mechanics, 2021, 42(9): 2405-2415.
[2] QIN Ai-fang, HU Hong-liang. Swelling characteristics of Gaomiaozi Ca-bentonite saturated in alkaline solution and prediction [J]. Rock and Soil Mechanics, 2020, 41(S1): 123-131.
[3] LIU Jie, YANG Yu-hua, YAO Hai-lin, LU Zheng, YUE Chan, . Experimental study on treatment of dispersive clay based on different modification methods [J]. Rock and Soil Mechanics, 2020, 41(S1): 163-170.
[4] TAN Yun-zhi, KE Rui, CHEN Jun-lian, WU Jun, DENG Yong-feng. Effect of sludge organic treated with alkaline solution and its mechanism [J]. Rock and Soil Mechanics, 2020, 41(5): 1567-1572.
[5] TAN Yun-zhi, LI Hui, WANG Pei-rong, PENG Fan, FANG Yan-fen, . Hydro-mechanical performances of bentonite respond to heat-treated history [J]. Rock and Soil Mechanics, 2019, 40(2): 489-496.
[6] ZHANG Yun-long, XIANG Wei, HUANG Wei, LIU Qing-bing, DAO Minh huan. Hydration evolution mechanism of sodium montmorillonite [J]. Rock and Soil Mechanics, 2019, 40(11): 4391-4400.
[7] HUANG Wei, XIANG Wei, WANG Jing-e, CHENG Chao-jie, CUI De-shan, LIU Qing-bing，. Development and application of digital image processing technology based soil tensile apparatus [J]. , 2018, 39(9): 3486-3494.
[8] HUANG Wei, XIANG Wei, LIU Qing-bing, DAO Minh-huan, WANG Zhen-hua, ZHANG Yun-long,. Associated evolutionary mechanism of hydration-pore for montmorillonite modified by ionic soil stabilizer [J]. , 2018, 39(10): 3631-3640.
[9] LIU Jian, CUI Peng, . Influence of water-soil chemical interaction on cohesive force: A case study of montmorillonite-quartz remolded soil [J]. , 2017, 38(2): 419-427.
[10] LIU Peng, LIU Jun-xin, MAO Hai-jun, YANG Zhong-tian, LIU Wei, WU Shang-wei, WANG Wen-qing,. Influences of γ-rays irradiation on strength and deformation behaviors of Gaomiaozi Na-bentonite [J]. , 2017, 38(10): 2949-2956.
[11] SUN Wen-jing, LIU Shi-qing, SUN De-an, WEI Zhen-fei. Influence of sand mixing ratio on swelling characteristics of bentonite-sand mixtures [J]. , 2016, 37(6): 1642-1648.
[12] ZHANG Tao, CAI Guo-jun, LIU Song-yu, LI Jun-hai, JIE Dao-bo，. Research on stabilization microcosmic mechanism of lignin based industrial by-product treated subgrade silt [J]. , 2016, 37(6): 1665-1672.
[13] ZHANG Long , SUN De-an , LIU Yue-miao，. Comparison between swelling properties of two Gaomiaozi Na-bentonites [J]. , 2016, 37(12): 3447-3454.
[14] HUANG Ming, ZHANG Jin-wu. Disintegration tests and energy dissipation characteristics of soft rock in acid and alkali solution [J]. , 2015, 36(9): 2607-2612.
[15] LIU Xin-rong ，ZHANG Liang ，FU Yan，. Experimental study of mechanical properties of argillaceous sandstone under wet and dry cycle in acid environment [J]. , 2014, 35(S2): 45-52.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] YAO Yang-ping, HOU Wei. Basic mechanical behavior of soils and their elastoplastic modeling[J]. , 2009, 30(10): 2881 -2902 .
[2] XU Jin-ming, QIANG Pei, ZHANG Peng-fei. Texture analysis of photographs of silty clay[J]. , 2009, 30(10): 2903 -2907 .
[3] XIANG Tian-bing, FENG Xia-ting, CHEN Bing-rui, JIANG Quan, ZHANG Chuan-qing. Rock failure mechanism and true triaxial experimental study of specimens with single structural plane under three-dimensional stress[J]. , 2009, 30(10): 2908 -2916 .
[4] SHI Yu-ling, MEN Yu-ming, PENG Jian-bing, HUANG Qiang-bing, LIU Hong-jia. Damage test study of different types structures of bridge decks by ground-fissure[J]. , 2009, 30(10): 2917 -2922 .
[5] XIA Dong-zhou, HE Yi-bin, LIU Jian-hua. Study of damping property and seismic action effect for soil-structure dynamic interaction system[J]. , 2009, 30(10): 2923 -2928 .
[6] XU Su-chao, FENG Xia-ting, CHEN Bing-rui. Experimental study of skarn under uniaxial cyclic loading and unloading test and acoustic emission characteristics[J]. , 2009, 30(10): 2929 -2934 .
[7] ZHANG Li-ting, QI Qing-lan, WEI Jing HUO Qian, ZHOU Guo-bin. Variation of void ratio in course of consolidation of warping clay[J]. , 2009, 30(10): 2935 -2939 .
[8] ZHANG Qi-yi. Study of failure patterns of foundation under combined loading[J]. , 2009, 30(10): 2940 -2944 .
[9] YI Jun, JIANG Yong-dong, XUAN Xue-fu, LUO Yun, ZHANG Yu. A liquid-solid dynamic coupling modelof ultrasound enhanced coalbed gas desorption and flow[J]. , 2009, 30(10): 2945 -2949 .
[10] TAO Gan-qiang, YANG Shi-jiao, REN Feng-yu. Experimental research on granular flow characters of caved ore and rock[J]. , 2009, 30(10): 2950 -2954 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd