| 砂土层中盾构隧道竖向土压力的转移机理及其计算 |
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| 引用本文： | 高登.砂土层中盾构隧道竖向土压力的转移机理及其计算[J].公路,2011(11). |
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| 作者姓名： | 高登 |
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| 作者单位： | 福建省交通规划设计院; |
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| 摘 要： | 开展了Trapdoor试验来模拟砂土层中盾构隧道的开挖,研究了Trapdoor上部竖向土压力的转移机理,总结了国内外土拱区侧压力系数K的取值,与试验结果进行了对比并给出其建议值。分析结果表明,隧道上覆土体通过拱效应把作用在衬砌管片上的部分竖向土压力传递到两边不动土体,从而导致竖向土压力明显减小,而水平向土压力有所增加;当土拱效应充分发挥时,按侧压力系数K=1计算得到的Trapdoor上部竖向土压力与试验结果比较接近。
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| 关 键 词： | 盾构隧道 衬砌 砂土 土拱效应 土压力 侧压力系数 |
Transfer Mechanism and Calculation of Vertical Soil Pressure Acted on Shield Tunnel in Sandy Soil Layer |
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| GAO Deng.Transfer Mechanism and Calculation of Vertical Soil Pressure Acted on Shield Tunnel in Sandy Soil Layer[J].Highway,2011(11). |
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| Authors: | GAO Deng |
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| Institution: | GAO Deng(Fujian Provincial Planning and Design Institute of Communications,Fuzhou 350004,China) |
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| Abstract: | A trapdoor test is developed to simulate the excavation of the shield tunnel in the sandy soil layer.The transfer mechanism of vertical soil pressure acted on the shield tunnel is studied.The existing lateral pressure coefficient K in the soil arching is summarized,compared and recommended.The test results show that the vertical soil pressure acted on the shield tunnel is tranfered to the adjoining stationary soil by arching effect,and it is reduced significantly with the increasing of horizontal soil press... |
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| Keywords: | shield tunnel liner sandy soil soil arching effect soil pressure lateral pressure coefficient |
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