水化学条件对高岭土压缩性的影响机理

doi:10.6040/j.issn.1672-3961.0.2017.442

山东大学学报 (工学版) ›› 2018, Vol. 48 ›› Issue (5): 109-117.doi: 10.6040/j.issn.1672-3961.0.2017.442

水化学条件对高岭土压缩性的影响机理

王者超^1,²(),王心语¹,韦昌富³,李崴¹,段广平¹,李帅¹,张春雨¹

1. 山东大学岩土与结构工程研究中心, 山东济南 250061
2. 东北大学深部金属矿山安全开采教育部重点实验室, 辽宁沈阳 110004
3. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室, 湖北武汉 430071

收稿日期:2017-09-04 出版日期:2018-10-01 发布日期:2017-09-04
作者简介:王者超(1980—),男,山东高唐人,教授,博士生导师,博士,主要研究方向为岩土工程. E-mail:wang_zhechao@hotmail.com
基金资助:
国家自然科学基金资助项目(51779045);国家自然科学基金资助项目(41572293);中国科学院大学生创新实践训练计划资助项目(Y110061Q01)

The effect of hydrochemical conditions on compression characteristics of kaolinite

Zhechao WANG^1,²(),Xinyu WANG¹,Changfu WEI³,Wei LI¹,Guangping DUAN¹,Shuai LI¹,Chunyu ZHANG¹

1. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China
2. Key laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110004, Liaoning, China
3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China

Received:2017-09-04 Online:2018-10-01 Published:2017-09-04
Supported by:
国家自然科学基金资助项目(51779045);国家自然科学基金资助项目(41572293);中国科学院大学生创新实践训练计划资助项目(Y110061Q01)

摘要/Abstract

摘要：

研究在不同水化学条件下高岭土的压缩特性，开展了不同化学溶液饱和条件下高岭土的一维固结试验。试验结果表明：在较低压力水平下，Na+或Ca²⁺明显降低了高岭土的压缩性，但随着离子浓度的增加，高岭土的压缩性又有提高的趋势，而高应力水平下离子浓度对高岭土压缩性的影响不明显；同一浓度下，Ca²⁺对试样压缩性的影响比Na⁺更明显；在酸性或碱性条件下高岭土压缩性均较中性条件下有所提高；回弹曲线同样受到水化学条件的影响。试验结果的作用机理为:水化学条件变化对高岭土压缩性的影响以物理-化学机制为主导，阳离子交替吸附作用与溶蚀、沉淀作用是改变土体压缩性的重要因素。为进一步揭示水-土化学作用的力学效应机理提供了依据。

关键词: 水化学条件, 高岭土, 压缩性, 力学模型, 物理-化学模型

Abstract:

In order to investigate the compression characteristics of kaolinite in various hydrochemical conditions, oedometer tests on kaolinite specimens saturated with acidic, alkaline and saline solutions were performed. The results indicated that Na⁺ and Ca²⁺ induced the compressibility of specimens significantly in low pressure level, while the increase of ion concentration made a growing trend in the compressibility of kaolinite; in the same concentration, the effect of Ca²⁺ on the compressibility of specimens was more obvious than Na⁺; in acidic or alkaline conditions, the compressibility of kaolinite was improved; hydrochemical condition also had effect on the rebound curve. Then the mechanism of the test was analyzed and it was considered that the effect of variation in hydrochemical conditions on compressibility of kaolinite included both mechanical model and physical-chemical model. Cation exchange and adsorption, dissolution and sedimentation were important influential factors of the compressibility of soil. The basis was provided for further revealing the mechanical mechanism of water-soil chemical interaction.

Key words: hydrochemical condition, kaolinite, compressibility, mechanical model, physical-chemical model

中图分类号:

王者超,王心语,韦昌富,李崴,段广平,李帅,张春雨. 水化学条件对高岭土压缩性的影响机理[J]. 山东大学学报 (工学版), 2018, 48(5): 109-117.

Zhechao WANG,Xinyu WANG,Changfu WEI,Wei LI,Guangping DUAN,Shuai LI,Chunyu ZHANG. The effect of hydrochemical conditions on compression characteristics of kaolinite[J]. Journal of Shandong University(Engineering Science), 2018, 48(5): 109-117.

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土类	设计含水率 ω₀/%	干密度 ρ_d/ (g·cm^-3)	试样直径 d/mm	初始高度 h₀/mm	颗粒密度 ρ_s/(g·cm^-3)	初始孔隙比 e₀
高岭土	48.3	0.858	61.8	20	2.65	2.09

编号	溶质	浓度/(mol·L^-1)	pH
S₁	去离子水		7
S₂	NaCl	0.50	7
S₃	NaCl	0.10	7
S₄	NaCl	0.05	7
S₅	CaCl₂	0.50	7
S₆	CaCl₂	0.10	7
S₇	CaCl₂	0.05	7
S₈	NaCl	0.10	4
S₉	NaCl	0.10	5
S₁₀	NaCl	0.10	9
S₁₁	NaCl	0.10	10

编号	总变形量/ mm	弹性变形量/mm	弹性变形所占比例/%
S₁	1.742	0.089	5.09
S₂	1.454	0.099	6.78
S₃	1.411	0.108	7.67
S₄	1.338	0.103	7.71
S₅	1.336	0.104	7.76
S₆	1.187	0.105	8.82
S₇	1.129	0.113	9.98
S₈	1.706	0.085	4.96
S₉	1.615	0.094	5.80
S₁₀	1.658	0.102	6.16
S₁₁	1.640	0.099	6.04

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水化学条件对高岭土压缩性的影响机理

The effect of hydrochemical conditions on compression characteristics of kaolinite

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