| 砂性地层中盾构隧道掘进围岩变形特性 |
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| 引用本文： | 张业炜,杨新安.砂性地层中盾构隧道掘进围岩变形特性[J].湖南科技大学学报(自然科学版),2011(4). |
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| 作者姓名： | 张业炜 杨新安 |
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| 作者单位： | 同济大学城市轨道与铁道工程系; |
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| 基金项目： | 铁道部科技研究开发计划重点项目(2006G007-E) |
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| 摘 要： | 以狮子洋隧道砂性地层段地质条件和施工资料为基础,建立有限差分数值计算模型.通过比较不同断面监测点随开挖进程的位移值,结果表明:先掘隧道围岩向中心收缩,上下部围岩变形明显大于两侧;后掘隧道对先掘隧道有横向外挤的作用,但对纵向几乎没有影响.对有、无渗流作用的2种工况的比较分析说明,起初渗流对围岩变形影响不大,但最终加剧了围岩的变形程度.提出了开挖面前方土体扰动的累积效应和累积效应曲线的确定方法,通过该曲线可确定土体扰动范围和程度,经过理论分析,认为影响土体位移速率的2个因素是土体与开挖面间距和盾构推力.
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| 关 键 词： | 盾构围岩 砂层 数值模拟 累积效应 |
Deformation characteristics of the shield tunnelling surrounding rock in sandy stratum |
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| ZHANG Ye-wei,YANG Xin-an.Deformation characteristics of the shield tunnelling surrounding rock in sandy stratum[J].Journal of Hunan University of Science & Technology(Natural Science Editon),2011(4). |
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| Authors: | ZHANG Ye-wei YANG Xin-an |
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| Affiliation: | ZHANG Ye-wei,YANG Xin-an(Department of Urban Track and Railway Engineering,Tongji University,Shanghai 200092,China) |
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| Abstract: | Based on the geological conditions and construction data in the sandy stratum of Shiziyang tunnel,the numerical model was established.By the comparison on the displacement of monitoring points in different sections during the excavation,it concluded that: the surrounding rock of the antecedence tunnel shrink to the centre,and the deformation of the top & bottom rock is obviously larger than that of the two sides.The antecedence tunnel has applied external force on the later tunnel;however,it has applied lit... |
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| Keywords: | tunnel surrounding rock sandy stratum numerical simulation cumulative effects |
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