| 列车荷载对下穿盾构隧道影响的模型试验 |
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| 引用本文： | 李彦民.列车荷载对下穿盾构隧道影响的模型试验[J].福建工程学院学报,2019,0(6):539-544. |
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| 作者姓名： | 李彦民 |
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| 作者单位： | 中铁十八局集团第一工程有限公司 |
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| 摘 要： | 为研究地面线路运营对下穿盾构隧道结构的影响规律，基于相似比理论建立室内大型试验模型，模拟上部列车荷载作用下土层及其内部盾构隧道结构的受力变形过程，总结变形规律。结果表明，模型试验能够较好地反映外部荷载影响下土层以及内部盾构隧道结构的受力和变形特性；地表列车荷载在土层传递过程中，同一层面上沿地面线路方向的土压力大于两侧土压力，远离线路的地层受列车荷载影响相对较小，同一竖向截面土压力变化量由上至下逐渐减小，即外部荷载对浅层土的影响明显大于深层土；盾构隧道在地表列车行驶过程中，环向出现背车面受拉迎车面受压的受力特性，呈斜向压扁，纵向应变从中间交叉点向盾构隧道两侧逐渐减小，呈下凹压弯；盾构隧道埋深越小，受地表荷载影响越显著，增大一倍埋深对应纵向应变最大值减小约44.5%。
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| 关 键 词： | 列车荷载 盾构隧道 模型试验 土压力 结构应变 |
Model test study on the influence of train load on shield tunnel |
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| LI Yanmin.Model test study on the influence of train load on shield tunnel[J].Journal of Fujian University of Technology,2019,0(6):539-544. |
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| Authors: | LI Yanmin |
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| Institution: | The First Engineering Co., Ltd. of China Railway 18 Bureau Group |
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| Abstract: | In order to study the influence law of ground line operation on the shield tunnel structure, an indoor large-scale test model was established based on the similarity ratio theory to simulate the stress deformation process of the soil layer and its internal shield tunnel structure under the upper train load, and the deformation law was summarized. Results show that the model test can better reflect the stress and deformation characteristics of the soil layer and the internal shield tunnel structure under the influence of external loads. During the transfer of surface train loads in different soil layers, the earth pressure along the surface line is greater than that on both sides on the same level, and the layer far away from the line is relatively less affected by the train load. The amount of earth pressure change in the same vertical section gradually decreases from top to bottom, that is, the external load has a greater influence on the shallow soil layer than on the deeper ones. During the running of the surface train, the shield tunnel is pulled in the circumferential direction of the back, and the bearing surface is compressed, which is obliquely flattened. The longitudinal strain gradually decreases from the middle intersection to the sides of the shield tunnel, and is concavely bent. The smaller the buried depth of the shield tunnel is, the more significantly it is affected by the surface load. Doubling the buried depth corresponds to a decrease of the maximum longitudinal strain of about 44.5% |
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| Keywords: | train load shield tunnel model test earth pressure structural strain |
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