MICROSTRUCTURE AND DEFORMATION PROPERTIES OF POLLUTED CLAY BY Pb2+ CHEMICAL SOLUTION
LU Haijun1，LIAO Zhuwei1，WANG Qi1，ZHAO Ying2，CHEN Wei1
(1. Institute of Porous Mechanics，Wuhan Polytechnic University，Wuhan，Hubei 430023，China；2. Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：The microstructure and deformation properties of clay was affected by the migration of Pb2+ chemical solution. In order to investigate surface morphology and pore structure of polluted clay by Pb2+ pollutant，the scanning electron microscope(SEM) test and low-temperature N2 adsorption test were carried out. The results of microstructure tests show that pore of undisturbed clay is small. The soil particles are mainly lamination arrangement. Pore size of polluted clay is mainly near 10 nm，and secondary pore increases. The arrangement of soil particles transformed lamination to point-point under chemical solution. A series of tests are conducted，unconfined compressive strength test，direct shear test and consolidation test，to research deformation properties of polluted clay. The unconfined compressive strength，shear strength and consolidation properties of undisturbed clay were affected obviously by Pb2+ chemical solution. The unconfined compressive strength of polluted clay decreased with increasing of Pb2+ pollutant concentration. The shear strength index(c，) of polluted clay decreased with an increase of Pb2+ pollutant concentration. As Pb2+ pollutant concentration increased，void ratio(e) of polluted clay increased，compressibility coefficient() and compression index() increased，but compression modulus() decreased.
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2014, Vol. 33 
