EXPERIMENTAL STUDY ON AXIAL STRAIN RATE OF FROZEN SOIL UNDER CYCLIC DYNAMIC LOAD

摘要

Based on of triaxial dynamic test at low temperature acted by varies amplitude cyclic loading, deformation behavior of frozen clay from BeiLu River near Qinghai-Tibet railway is studied. According to relation curves of time and residual strain of frozen soil under different temperature, frequency, confining pressure and water content, conclusions can be drawn as follows: dynamic load affects axial strain rate greatly, axial strain rate increases with stress ratio, decreases temperature dropping, frequency and water content rising, and increases with confining pressure linearly. Exponential function used to fit relations between stress ratio and temperature, water content, frequency and axial strain rate is presented, and mechanism of settlement caused by vibration inducing defreeze, the particular property of frozen soil, is explained.