Experimental study on strength and deformation characteristics of cement-modified expansive soil
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Abstract:
The conventional laboratory triaxial tests are carried out to study strength and deformation characteristics of cement-modified expansive soil by taking medium/weak expansive soil in Simashan as object of the study and cement as modified material.The results show that the plastic limit of expansive soil can be increased and the plastic limit index and free expansion rate can be reduced by cement modification.The triaxial stressstrain curve of cement-modified expansive soil presents three segments of elasticity,non-linear strengthening and stress softening.With the increase in confining pressure,the softening type gradually develops to hardening type.Both peak strength and residual strength increase with the increase in confining pressure.The specimens are in shear failure mode,and the shear failure angle conforms to the calculated value of MohrCoulomb theory.
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