循环球应力对饱和软黏土动应变发展规律的影响及其作用机制

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Abstract The cyclic spherical stress is very common in the dynamic stress field of soils；however，in previous researches，it was usually neglected. Based on the dynamic triaxial tests with cyclic confining pressure，the influences of cyclic spherical stress on the strain behavior of saturated clays are studied through coupling cyclic confining pressure and cyclic deviatoric stress. Moreover，the action mechanisms are also discussed. Test results show that the existence of cyclic spherical stress not only changes the development speeds of cyclic strain，but also changes the ratios of maximum compression strain to maximum extension strain. The influences are not only related to the phase differences between cyclic spherical stress and cyclic deviatoric stress，but also related to the amplitude of cyclic deviatoric stress. When the phase angle is 180°，the compressive strain develops more quickly；and when the phase angle is 0°，the tension strain develops more quickly. Based on the test results，the action mechanisms of cyclic spherical stress on the changes of dynamic strain behavior are explained from the perspective of the total stress and the effective stress，respectively.

Key words： soil mechanics cyclic spherical stress laboratory test saturated soft clay dynamic strain

Received: 19 November 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I5/1057

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