Dynamic Properties of Solani Sand At Small Strains Using Resonant Column Apparatus


Abstract eng:
Dynamic properties of soils vary significantly with the level of strain. During earthquakes, the behaviour of soil is much dependent on its dynamic characteristics. The behaviour of soils are very different at small and large strains. For laboratory tests, the resonant column apparatus (RCA) is a fairly precise device and widely used to measure the shear modulus and damping ratio of soils at low and medium strains. Conventional resonant column testing is based on the determination of the resonant frequency of a soil specimen by measuring the specimen response at different excitation frequencies. Himalayan region is a seismically active zone and Roorkee city in North India falls under its subduction zone. The city has experienced effect of earthquakes in the past and faces the danger of severe seismic threat in future also. Large area of Roorkee is covered by soil from the bed of Solani River i.e. Solani sand. In this paper, the strength characteristics of Solani sand has been investigated by a series of resonant column tests, which has been never reported in the literature. The fixed-free torsional resonant column tests were performed using a resonant column device and its associated software, GDSLAB. A number of resonant column tests were performed on cylindrical soil specimens to evaluate dynamic soil properties viz. shear modulus and damping ratio of the Solani sand. The paper presents, effects of two key parameters i.e. relative density and confining pressure on dynamic properties of Solani sand in the small shear strain range (0.001 % to 0.1 %). The effect of both relative density and confining pressure on the shear modulus is significant; however, effect of these parameters on the damping ratio is not so significant.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 886.:
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