Development of Failure Criterion for Partially Saturated Cohesive Soils

 

Hadi Ahmadi

Department of Civil Engineering, the University of Guilan, Rasht Iran

Mahyar Arabani

Associate Professor, Department of Civil Engineering, the University of Guilan, Rasht, Iran

Farzin Kalantary

Assistant Professor, Department of Civil Engineering, the University of Guilan, Rasht, Iran

ABSTRACT

Constitutive models of partially saturated soils have been widely used in geotechnical engineering. Most of these models depend on complicated parameters; among them, soil suction is the most important one. However, the equipment and level of expertise required for determination of this parameter during a test procedure is beyond the capabilities of most of geotechnical laboratories. Thus, a Constitutive model independent of soil suction may be very interested instead of such complicated laboratory measurements. In this research, a new Constitutive model of partly saturated soils is presented. This model is constructed based on a series of collected data from different authors and validated with their experimental results. Employing a dramatic and continuous transition of soil strengths from a fully saturated to completely dry condition is the base of this model. Soil parameters which were used in this approach are moisture content, plasticity indices, saturated-drained internal friction angle and unconfined compressive strength of soil in dry and hardened states. Based on presented equation in this research and introduced effective parameters, it is possible to determine partially saturated soils shear strengths without any measurement of soil suction.

Keywords: saturated soils; Constitutive models; Hyperbolic function; Matric Suction.

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