Influence of Pore Water Chemistry on the Swelling Pressure of Compacted Bentonite   Jia Jing-chao Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, China e-mail: jjcdut@yahoo.cn Yang Qing School of Civil and Hydraulic Engineering and The State Key Lab. of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China e-mail: qyang@dlut.edu.cn
			ABSTRACT

The effects of mechanical factors imposed on soils and physical character of soils on the swelling behaviors of bentonites have been studied by many researchers. However few investigations have been done into the effects of chemical character of pore electrolyte solutions of soils. In this paper, the experimental study on the influences of electrolyte solution concentration on the swelling pressure is conducted. The results indicate that the swelling pressure decrease with the increased concentration of pore solution. If the concentrations of solutions used to inundate the soil sample are lower than that ones used to prepare the soil sample, the swelling pressures are not necessarily larger than the ones obtained in the cases that the concentrations of solutions used to prepare and to inundate the sample is same.

Keywords: bentonite, swelling pressure, pore water chemistry

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