Undrained shear strength of clays as modified by pH variations

被引：45
|
作者：
Spagnoli, Giovanni [1 ]
Rubinos, David [1 ]
Stanjek, Helge
Fernandez-Steeger, Tomas [1 ]
Feinendegen, Martin [2 ]
Azzam, Rafig [1 ]
机构：
[1] Rhein Westfal TH Aachen, Dept Engn Geol & Hydrogeol, D-52064 Aachen, Germany
[2] Rhein Westfal TH Aachen, Chair Geotech Engn, D-52064 Aachen, Germany
来源：
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT | 2012年 / 71卷 / 01期
关键词：
Undrained shear strength; Kaolinite; Na-smectite; pH; Ground improvement; AQUEOUS-ELECTROLYTE SOLUTIONS; MONTMORILLONITE SUSPENSIONS; HYDRAULIC CONDUCTIVITY; NA-MONTMORILLONITE; COMPACTED CLAY; CHARGE-DENSITY; KAOLINITE; DISSOLUTION; 25-DEGREES-C; BENTONITE;
D O I：
10.1007/s10064-011-0372-9
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The undrained shear strength of clays is an important geotechnical parameter used during construction processes. Several laboratory tests were performed on kaolinite and smectite mixed with pore fluids with different pH values. Vane shear tests were carried out and it was found that the undrained shear resistance for clays increased considerably if the pore fluid had a high or a low pH. A possible explanation could be the dissolution of Al3+ which acts as a coagulant, increasing the internal shear resistance. Geochemical computations, Al measurements and zeta-potential experiments were performed to confirm this theory. The research suggests varying the pH may make a useful contribution to soil improvement techniques.
引用
收藏
页码：135 / 148
页数：14
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