| Related citation: | Yalin Zhu,Yanke Gao,Liming Wu,Qian Xu,Juxiang Chen.Experimental Study of Cumulative Plastic Strain in Reinforced Sand Under Cyclic Loading[J].Journal of Harbin Institute Of Technology(New Series),2025,32(4):45-54.DOI:10.11916/j.issn.1005-9113.2024041. |
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| Author Name | Affiliation | | Yalin Zhu | School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
Key Laboratory of Civil Engineering Structure and Materials, Hefei 230009, Anhui, China | | 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 | | Qian Xu | School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China | | Juxiang Chen | School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
Key Laboratory of Civil Engineering Structure and Materials, Hefei 230009, Anhui, China |
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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. Moreover, 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. Furthermore,The cumulative plastic strain evolution law can be effectively predicted. The significance of parameters A, B and C is analyzed in detail. This study can provide theoretical references for further understanding of the deformation characteristics and settlement prediction of railway subgrades. |
| Key words: reinforced sand dynamic triaxial test accumulated plastic strain predictive model. |
| DOI：10.11916/j.issn.1005-9113.2024041 |
| Clc Number:TU4 |
| Fund: |
