Journal of Shandong University(Engineering Science) ›› 2018, Vol. 48 ›› Issue (5): 109-117.doi: 10.6040/j.issn.1672-3961.0.2017.442

• Civil Engineering • Previous Articles     Next Articles

The effect of hydrochemical conditions on compression characteristics of kaolinite

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

  1. 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)

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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

CLC Number: 

  • U43

Table 1

Initial states of specimens"

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

Table 2

Preparation of solution"

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

Fig.1

Instrument and specimens saturating"

Fig.2

One-dimensional consolidation curves of kaolinite in solutions with various ion concentrations"

Fig.3

One-dimensional consolidation curves of kaolinite in solutions with various solutes"

Fig.4

One-dimensional consolidation curves of kaolinite in solutions with various pH values"

Table 3

Total deformation and elastic deformation of specimens in different solutions"

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

Fig.5

Electric charge on soil particle"

Fig.6

Cementation of soil particles"

Fig.7

Coefficient of compressibility of specimens at various pressure level in CaCl2 solution with different concentrations"

Fig.8

Coefficient of compressibility of specimens at 100~200 kPa in CaCl2 solution with various concentrations"

Fig.9

Axial strain of specimens at 200 kPa in solutions with various concentrations"

Fig.10

Coefficient of compressibility of specimens atvarious pressure levels in 0.1 mol/L NaCl solution with different pH values"

Fig.11

Rebound index of specimens in solutions with various concentrations"

Fig.12

Rebound index of specimens in 0.1 mol/L NaCl solution with various pH values"

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