| Author Name | Affiliation | Postcode | | Yalin Zhu | 1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
2. Key Laboratory of Civil Engineering Structure and Materials, Hefei 230009, Anhui, China | 230009 | | Yanke Gao | School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China | | | Liming Wu | School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China | 230009 | | Qian Xu* | School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China | 230009 | | Juxiang Chen | 1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
2. Key Laboratory of Civil Engineering Structure and Materials, Hefei 230009, Anhui, China | 230009 |
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| Abstract: |
| Long-term cyclic train loading can cause settlement and deformation of the roadbed, affecting the normal operation of trains. In order to investigate the strain pattern of reinforced sandy soil under train loading, a series of dynamic triaxial tests were carried out using multi-stage loading, focusing on the effects of the number of reinforcement layers, the confining pressure and the mesh size of the geogrid on the accumulated plastic strain of reinforced sandy soil. And the prediction models were proposed. The test results show that: 1) The cumulative plastic strain versus vibration times of the specimens under different reinforcement layers exhibited three stages, namely the rapid development stage, the rate transformation stage and the stability stage; 2) The cumulative plastic strain decreases with increasing the number of reinforcement layers, but the magnitude of the effect of reinforcement on the cumulative plastic strain decreases with increasing the number of reinforcement layers, increasing the perimeter pressure and decreasing the mesh size of the geogrid have similar effects on the cumulative plastic strain pattern as increasing the number of reinforcement layers; 3) Combined with the cumulative plastic strain law, a comprehensive model is proposed and the coefficient of determination is greater than 0.99. The cumulative plastic strain evolution law can be effectively predicted. The significance of parameters A, B and C is analyzed in detail. The research can provide theoretical references for further understanding of the deformation characteristics and settlement prediction of railway subgrade. |
| Key words: reinforced sand dynamic triaxial test accumulated plastic strain predictive model. |
| DOI：10.11916/j.issn.1005-9113.2024041 |
| Clc Number:TU4 |
| Fund: |
