Dynamic characteristics of saturated red clay under variable confining pressure

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 17-23.

WU Lianqi1,2,3,Xie Li2,Yang Xiao1

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Abstract

The stress path of real subgrade filler is very complicated, andthe traditional cyclic tri-axial dynamic tests are conducted under constant confining pressureand they can’t stimulate load-bearing states of real subgrade filler.Here, in order to simulate real stress states of roadbed under traffic load,cyclic tri-axial tests were conducted for saturated red clay atsouthern area of Jiangxi province under constant confining pressure (CCP) and variable one (VCP), respectively.Under three stress states of the same maximum stress state, the same mean one and the same initial one, effects of variable confining pressure on pore pressure development, rebound modulus and axial cumulative deformation of red clay were contrastively analyzed.The results showed that variable confining pressure cancauseincrease in pore pressure accumulation under three stress states; for the same maximum stress state, specimens’ rebound modulus is lower under variable confining pressure, their cumulative deformation is larger; for the same minimum stress state, the situation is opposite;for the same mean stress state, effects of variable confining pressure on long-term deformation characteristics of red clay can be neglected.

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red clay / variable confining pressure / stress paths / cyclic characteristics

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WU Lianqi1,2,3,Xie Li2,Yang Xiao1. Dynamic characteristics of saturated red clay under variable confining pressure[J]. Journal of Vibration and Shock, 2019, 38(17): 17-23

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