| 车载下地基差异沉降对地铁隧道结构的影响分析 |
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| 引用本文： | 姜洲,高广运,戴海峰,刘欢. 车载下地基差异沉降对地铁隧道结构的影响分析[J]. 地下空间与工程学报, 2014, 10(6): 1433-1439 |
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| 作者姓名： | 姜洲 高广运 戴海峰 刘欢 |
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| 作者单位： | 1. 安徽省综合交通研究院股份有限公司,合肥 230001;2. 同济大学岩土及地下工程教育部重点实验室,上海 200092;3. 上海申元岩土工程有限公司,上海 200040 |
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| 基金项目： | 国家自然科学基金项目(51178342);高等学校博士点基金博导类资助课题(20130072110016) |
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| 摘 要： | 当地铁隧道地基存在差异沉降时,轨面在车载作用下会产生相应的不平顺,进而影响乘车的舒适度和行车的安全性。将地基视为弹性半空间,采用余弦函数模拟地基差异沉降槽,基于既有二系悬挂的车辆模型,建立车-轨-隧道-地基耦合模型,分析不同车速、差异沉降值、轨道-地基条件的组合情况下,钢轨支撑反力和隧道下卧土体竖向位移的变化规律。结果表明:随沉降槽深及车速的增加,轨下支撑反力及隧道下卧土体的变形显著增加,且随车速及轨下支撑刚度增大,沉降槽的影响也愈加明显;隧道结构及下卧土体变形随土质条件变化趋势受沉降槽深的影响较小。
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| 关 键 词： | 地铁 隧道结构 沉降槽 支撑力 变形 |
| 收稿时间： | 2014-08-19 |
Influence of Differential Subgrade Settlement on Metro Tunnel Structure under Train Load |
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| Jiang Zhou,Gao Guangyun,Dai Haifeng,Liu Huan. Influence of Differential Subgrade Settlement on Metro Tunnel Structure under Train Load[J]. Chinese Journal of Underground Space and Engineering, 2014, 10(6): 1433-1439 |
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| Authors: | Jiang Zhou Gao Guangyun Dai Haifeng Liu Huan |
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| Affiliation: | 1. Anhui Comprehensive Transportation Research Institute Co., Ltd, Hefei 230001, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University,Shanghai 200092, China;3.Shanghai Shenyuan Geotechnical Engineering Co., Ltd, Shanghai 200040, China |
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| Abstract: | Differential settlement of tunnel subgrade brings corresponding track irregularity under subway load,the latter affects the train operation safety and comfort.The cosine function is applied to simulate differential settlement trough of elastic half-space foundation. Based on the existing Secondary suspension vehicle model, the vehicle-rail-tunnel-subgrade coupled model is built to analyze the change rules of the force acting on the track bed and the deformation of subgrade soil under different combinations of velocity,settlement and rail-subgrade condition. The results show that with the increase of speed and the depth of settlement trough, the supporting force and the deformation of tunnel subgrade is significantly increased, and the influence of settlement trough is more and more obvious with the increase of speed and support stiffness. The deformation of tunnel structure and subgrade soil changes with soil condition, but the change rules do not appear to be affected by the depth of settlement trough. |
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| Keywords: | subway tunnel structure settlement trough supporting force deformation |
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