Shear strength of IS sand under various normal stresses

Durga Prasad, B and Hariprasad, C and Umashankar, B (2014) Shear strength of IS sand under various normal stresses. In: Indian Geotechnical Conference IGC-2014, 18-20 December 2014, Kakinada, India.

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Abstract

In the design of earth structures, the mobilized angle of shearing resistance of the soil deposit is assumed to be constant along the slip plane. However, since the early works of Taylor (1960) and Rowe (1962), many researchers have studied the effect of normal stress on the friction angle and the dilatancy of soil sample during shearing. In this paper, direct shear test apparatus was used to study the effect of normal stress on the shearing resistance and the dilatancy behavior of Indian Standard soil (Grade II) for a relative density of 70 % by varying the normal stress from 5 to 400 kPa. This paper provides details on the sample preparation, morphology of sand particles obtained using scanning electron microscopic (SEM) studies, and the shear strength envelope for IS sand (Grade II). INTRODUCTION Design and construction of earth works are becoming popular in the world. Shear strength of soil plays a major role in the design and it depends on the shape of the particles, relative density, and confining stresses. Mainly, Soil exhibit dilatancy behavior which increases with increase in relative density and decreases with increase in confining stress. The effective stress and density of soil affect the rate of dilatancy of soils and thereby their strength parameters (Bolton 1986). The strength and dilatancy behavior of the sands was studied by many researchers like Taylor; Bolton 1986; Li & Dafalias 2000. The shear strength and dilatancy behavior of the sand at very low confining stress was done to establish a correlation between peak friction angle, critical-state friction angle and on dilatancy (Chakroborty and Salgado 2010). The dilatancy towards critical states is central to an understanding of soil behavior. In order to know the local soil response at very shallow depths it is important to know how the soil will behave at low confining stresses. Mobilization of shear strength in

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