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| Probabilistic model of cumulative plastic strain of coarse-grained soil fill based on large-scale dynamic triaxial tests |
| LENG Wuming1,2, ZHAI Bin1, XU Fang1,2, ZHANG Qishu1, AI Xi1, HAN Xu1 |
1.School of Civil Engineering, Central South University, Changsha 410075, China;
2.National Engineering Lab for High Speed Railway Construction, Changsha 410075, China |
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Abstract The cumulative plastic deformation of subgrade soils under long-term cyclic dynamic loads is discrete. Firstly, a series of large-scale dynamic triaxial tests of a coarse-grained soil filling were conducted to investigate the development trend and variation law of cumulative plastic strain with confining pressure, dynamic stress and water content. The results show that the cumulative plastic strain and its stable value increase with the increase of dynamic stress and decrease with the increase of confining pressure, indicating that the increase of confining pressure can effectively inhibit the cumulative plastic deformation of the soil. The dynamic stability of the soil increases with the decrease of water content. Secondly, based on the semi-logarithmic prediction model, the relevance theory of grey systems is adopted to explore the correlation between the model parameters and water content and dynamic-static stress ratio, and a normality test is performed to demonstrate that the model parameter controlling the growth rate of the cumulative plastic strain of the coarse-grained soil obeys a normal distribution. Finally, based on the probability failure theory, a probabilistic model for predicting the cumulative plastic strain of coarse-grained soil fillings is proposed, which can predict the cumulative plastic strain development range of coarse-grained soil fillings under cyclic dynamic loadings.
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Received: 29 January 2019
Published: 28 July 2020
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