| 地铁列车荷载作用下黏弹性地基动应力特征分析 |
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| 引用本文： | 丁智,李丹薇,谢宗星,魏新江.地铁列车荷载作用下黏弹性地基动应力特征分析[J].西北地震学报,2016,38(6):889-895. |
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| 作者姓名： | 丁智 李丹薇 谢宗星 魏新江 |
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| 作者单位： | 浙江大学城市学院土木工程系, 浙江 杭州 310015,浙江大学城市学院土木工程系, 浙江 杭州 310015,浙江大学海洋学院, 浙江 舟山 316021,浙江大学城市学院土木工程系, 浙江 杭州 310015 |
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| 基金项目： | 浙江省自然基金项目（LQ16E080008）；国家自然科学基金项目（51278463，51508506） |
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| 摘 要： | 基于Kelvin空间半无限体黏弹性解,以单个轮轴荷载为例,研究地铁列车荷载下地基土动应力状态、应力路径及主应力轴旋转等应力变化规律,并与相应弹性解下的各动应力特征进行对比分析,探讨更适用于工程实际的地基附加动应力特征解。结果表明:弹性地基与黏弹性地基中的各应力状态变化总体趋势、主应力轴旋转变化趋势相同,但极限应力状态各应力分量大小及应力路径形状有明显差别,考虑黏弹性解更符合软土区地铁长期变形实际工况;并对单轮荷载下动应力特征的黏弹性解进行参数分析,发现特征系数对应力分量影响具有不同特性。
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| 关 键 词： | 地铁 黏弹性地基 应力状态 应力路径 主应力轴旋转 |
| 收稿时间： | 2016/1/20 0:00:00 |
Dynamic Stress Characteristics of Viscoelastic Foundations under Subway Train Loads |
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| DING Zhi,LI Dan-wei,XIE Zong-xing and WEI Xin-jiang.Dynamic Stress Characteristics of Viscoelastic Foundations under Subway Train Loads[J].Northwestern Seismological Journal,2016,38(6):889-895. |
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| Authors: | DING Zhi LI Dan-wei XIE Zong-xing and WEI Xin-jiang |
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| Institution: | Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, Zhejiang, China,Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, Zhejiang, China,Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China and Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, Zhejiang, China |
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| Abstract: | This paper presents a comparative evaluation of elastic and viscoelastic solutions to identify more suitable and practical engineering solutions. Based on the viscoelastic solutions of a Kelvin''s space half-infinite body, as an example, we analyzed the dynamic stress response under moving subway loads to illustrate the characteristics of dynamic stress, the stress path, and the principal stress axis rotations. By applying two solutions, we found the numerical results for the development trends of the dynamic stress state and principal stress axis rotation to be similar. We also found discrepancies in the dynamic stress of the ultimate state and stress path. Additionally, our results indicate that a viscoelastic solution is more applicable to actual working cases of long-term metro tunnel deformation in soft soil areas. Moreover, according to our analysis of viscoelastic solutions of dynamic stress characteristics under single-wheel loads, we found different feature coefficients to have different influences on stress characteristics. |
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| Keywords: | subway viscoelastic foundation stress state stress path principal stress axes rotation |
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