| 重载铁路粉质黏土填料回弹模量及预估模型研究 |
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| 引用本文： | 李长生. 重载铁路粉质黏土填料回弹模量及预估模型研究[J]. 路基工程, 2023, 0(2): 1-6. DOI: 10.13379/j.issn.1003-8825.202205008 |
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| 作者姓名： | 李长生 |
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| 作者单位： | 朔黄铁路发展有限责任公司，河北肃宁 062350 |
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| 基金项目： | 国家自然科学基金资助项目（51978672） |
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| 摘 要： | 以朔黄铁路广泛应用的粉质黏土填料为研究对象，采用杠杆仪法测定粉质黏土的回弹模量，研究含水率和干密度对重载铁路路基填料回弹模量的影响。研究表明：路基土体的回弹模量随干密度的增大而增大，随含水率的增大而减小；相比于干密度，土体的回弹模量对于含水率更敏感；提出可考虑含水率和干密度影响的路基基床土体弹性模量预估模型；通过实际铁路路基监测数据，验证模型在预估路基弹性变形方面的有效性。研究结果对于在外荷载和雨水联合作用下，进一步认识粉质黏土填料路基的弹性变形特性、状态评估与加固强化设计，具有参考价值。
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| 关 键 词： | 铁路路基 粉质黏土 杠杆压力仪法 回弹模量 干密度 含水率 |
| 收稿时间： | 2022-07-07 |
Research on Resilient Modulus and Prediction Model of Silty Clay Filler for Heavy-haul Railway |
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| Abstract: | Taking at the silty clay fillers widely used in the Shuozhou—Huanghua Heavy-haul Railway as the research object, the resilient modulus of silty clay was measured by lever method, and the effects of moisture content and dry density on the resilient modulus of silt clay filler for heavy-haul railway was studied. The research shows that the resilient modulus of subgrade soil increases with the increase of dry density and decreases with the increase of moisture content. Compared with dry density, the resilient modulus of soil is more sensitive to moisture content. A model for predicting soil elastic modulus of subgrade bed is proposed, which can consider the effects of moisture content and dry density. Through the actual railway subgrade monitoring data, the effectiveness of the model in predicting the elastic deformation of the subgrade is verified. The research results are of use and reference value for further understanding the elastic deformation characteristics, state evaluation and reinforcement design of silty clay filled subgrade under the combined action of external load and rainwater. |
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