Dynamic stress response in a novel prestressed subgrade under heavy-haul train loading: A numerical analysis
文献类型：期刊论文
| 作者 | Zhang, Qishu2; Dong, Junli3; Leng, Wuming3; Zhang, Cong2; Wen, Changping2; Zhou, Zhenhua1,4 |
| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2024-01-19 |
| 卷号 | 412页码:17 |
| 关键词 | Prestressed subgrade Track irregularity Heavy-haul train 3D finite element model Dynamic stress |
| ISSN号 | 0950-0618 |
| DOI | 10.1016/j.conbuildmat.2023.134749 |
| 英文摘要 | To explore the dynamic transient characteristics induced by passing heavy-haul trains in newly-developed prestressed subgrade, two three-dimensional finite element models were constructed in the time domain using ABAQUS software. These models are categorized as train-track-prestressed subgrade and train-trackunreinforced subgrade. The numerical models also incorporated the vertical track irregularity commonly found in heavy-haul railways. The investigation aims to discern the dynamic stress response differences in both types of subgrades under three distinct train axle loads. Model validation occurred through comparisons with field tests gathered from various heavy-haul railways in China, as well as analogous numerical simulation cases. The findings indicate that track irregularity results in an asymmetric distribution of dynamic stress on the subgrade surface beneath both left and right rails, aligned transversely with the subgrade centerline. Additionally, this asymmetry is notably pronounced. The peak dynamic stress on the subgrade surface beneath the rails for both subgrades increases with escalating train axle loads. However, the prestressed reinforcement structure (PRS) effectively modulates this phenomenon, with the controlling advantage intensifying as train axle load increases. The average dynamic stress level in the prestressed subgrade is marginally lower than in the unreinforced subgrade within the roadbed layer beneath rails. Furthermore, train axle loads amplify the variation level of dynamic stress in the subgrade. However, the variable coefficient of dynamic stress in the prestressed subgrade is less than in the unreinforced subgrade, suggesting that PRS contributes positively to maintaining subgrade dynamic stability. In terms of the longitudinal distribution of peak dynamic stress, both subgrades exhibit normal distribution at varying depths within the roadbed layer. Lastly, the additional dynamic stress in prestressed steel bars also rises with increasing train axle loads. Nonetheless, it remains substantially lower than the static target pre-tensile stress. Moreover, the dynamic responses of prestressed steel bars in different rows attenuate as depth increases away from the subgrade top surface. In summary, this study establishes that PRS significantly enhances the dynamic stability of railway subgrade. |
| 资助项目 | Science Foundation of China[2022M713654] |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001150780500001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/40457]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Dong, Junli |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410004, Peoples R China 3.Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Qishu,Dong, Junli,Leng, Wuming,et al. Dynamic stress response in a novel prestressed subgrade under heavy-haul train loading: A numerical analysis[J]. CONSTRUCTION AND BUILDING MATERIALS,2024,412:17. |
| APA | Zhang, Qishu,Dong, Junli,Leng, Wuming,Zhang, Cong,Wen, Changping,&Zhou, Zhenhua.(2024).Dynamic stress response in a novel prestressed subgrade under heavy-haul train loading: A numerical analysis.CONSTRUCTION AND BUILDING MATERIALS,412,17. |
| MLA | Zhang, Qishu,et al."Dynamic stress response in a novel prestressed subgrade under heavy-haul train loading: A numerical analysis".CONSTRUCTION AND BUILDING MATERIALS 412(2024):17. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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