青藏冻结黏土滞回曲线形态特征的定量研究

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Abstract Morphological characteristics of hysteretic curves consist of closure，degree of width，degree of tilting to strain axis，intensive level and the area of the hysteretic curve. Residual strain ?p，the ratio ? of short axis length to long axis length，the gradient k of the long axis，the distance d between two center points of adjacent hysteretic curves，and the area S of the hysteretic curve are used to quantitatively measure morphological characteristics of hysteretic curves. Triaxial tests for different negative temperatures are carried out to study morphological characteristics of hysteretic curves of Qinghai—Tibet frozen clay. The test results show that：?p，?，k，d and S change little with increasing cycle numbers under the same dynamic load condition；therefore，average values of ?p，?，k，d and S are adopted to measure morphological characteristics of hysteretic curves；?p，?，d and S increase gradually，and k decreases gradually with increasing dynamic strain amplitude. In other words，closure decreases，degree of width increases，intensive level decreases，degree of tilting to strain axis increases and the area of the hysteretic curve increases with increasing dynamic strain amplitude，which indicate that residual plastic strain，viscosity，degree of microscopic damage and energy dissipation increase gradually，and stiffness decreases gradually.

Key words： soil mechanics Qinghai&mdash Tibet frozen clay hysteretic curves closure degree of width intensive level

Received: 19 June 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I1/208

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