Effect of cyclic loading on the residual strength of over-consolidated silty clay in a ring shear test |
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| Authors: | Yong Hong Guangming Yu Yingxia Wu Xiaoyu Zheng |
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| Institution: | (1) School of Civil Engineering, Qingdao Technological University, Fushun Road No.11, Qingdao, 266033, People’s Republic of China;(2) Construction Engineering College, Jilin University, Changchun, 130026, People’s Republic of China |
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| Abstract: | In this paper, the effect of cyclic loading on drained residual strength of over-consolidated silty clay is examined based
on the results from ring shear tests which were conducted with a sophisticated ring shear apparatus. Initially sheared to
form shear zones under different pre-consolidation pressures and at different shear rates (SRs), soil samples were then tested
under cyclic loading. After the cyclic loading application, the samples were re-sheared while the corresponding shear strengths
were measured. The results show that the effect of cyclic loading on residual strength is noticeable. The effect is related
to pre-consolidation history and SR of the soil samples. Under conditions of relatively low over-consolidation ratio (OCR),
the soil samples show an increase in residual strength with decreasing SR after cyclic loading. Most of the peak strength
values after cyclic loading are higher than the residual strength values obtained before cyclic loading. Two effects of cyclic
loading on the residual strength are identified: (a) If OCR is less than or equal to 3.0, the residual strengths measured
after cyclic loading are larger than those before cyclic loading; (b) If OCR is greater than or equal to 3.5, the residual
strengths after cyclic loading tend to become lower than those in the shear tests before cyclic loading. |
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