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| Study on the Characteristics of Saturated Subgrade Mud Pumping under Train Load |
| ZHANG Jiasheng1, JIA Yu1, DING Yu2, WANG Xuan1, YAN Hongye3, CHEN Xiaobin1 |
1. Central South University, Changsha, Hunan 410083, China;
2. Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China;
3. China Academy of Railway Sciences Corporation Limited, Beijing 100081, China |
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Abstract Research purposes: The increase of heavy-haul train axle load enhances the dynamic stress at different depths of the subgrade, leading to more and more serious subgrade issues such as mud pumping. In this paper, a series of refined model tests were carried out to study the characteristics of mud pumping of saturated silty clay subgrade under the heavy-haul train load. The influence of cyclic loading amplitude and loading frequency on the axial strain, excess pore water pressure, and fine particles migration characteristics of the sample was analyzed.
Research conclusions: (1) The cyclic loading amplitude has a significant impact on the characteristics of mud pumping from silty clay subgrade. As the cyclic loading amplitude increases, axial strain and excess pore water pressure rise, intensifying mud pumping. (2) The loading frequency has a certain influence on the characteristics of subgrade mud pumping. In general, higher loading frequencies decrease the final axial strain and excess pore water pressure, reducing mud pumping quality post-test. The increased frequency can't accelerate the mud pumping severity, but can shorten the duration of mud pumping. (3) Under cyclic loading, the excess pore water pressure gradient drives the migration of fine particles in the subgrade soil, resulting in mud pumping. (4) The research results can provide a reference for the treatment of the mud pumping issues in the heavy-haul train subgrade.
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Received: 25 October 2023
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2024, Vol. 41 
