| 大直径泥水平衡盾构浅覆土始发数值分析 |
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| 引用本文： | 刘方,高峰,徐汪豪.大直径泥水平衡盾构浅覆土始发数值分析[J].铁道标准设计通讯,2019(2):104-109. |
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| 作者姓名： | 刘方 高峰 徐汪豪 |
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| 作者单位： | 重庆交通大学土木工程学院;中铁工程设计咨询集团有限公司;西南交通大学土木工程学院 |
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| 摘 要： | 依托新建京张铁路清华园隧道工程,使用有限差分软件对大直径泥水平衡盾构的浅覆土始发掘进进行数值模拟。结果表明,未加固地层条件下,盾构始发时开挖面无法自稳。通过对比分析不同加固范围条件下洞门中心土体的挤出变形以及地表沉降变化规律,提出盾构始发地层加固的最佳范围,并获得在该加固范围下土体扰动引起的地表位移分布特征。
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| 关 键 词： | 铁路隧道 盾构隧道 泥水平衡盾构 浅覆土掘进 数值模拟 地表沉降 |
Numerical Analysis of the Launching of Large-diameter Slurry Balance Shield under Shallow Overburden |
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| Institution: | ,School of Civil Engineering,Chongqing Jiaotong University,China Railway Engineering Design and Consulting Group Co.,Ltd.,School of Civil Engineering,Southwest Jiaotong University |
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| Abstract: | Based on the Tsinghuayuan tunnel project of the newly-built Beijing-Zhangjiakou Railway,finite difference software is used to simulate the launching of large-diameter slurry balance shield under shallow overburden. The results of the simulation show that the excavation face can't remain stable while the launching is performed under the condition of unconsolidated stratum. By comparing and analyzing the deformation of the center soil of the portal part and the law of surface settlement under different reinforcement ranges,the optimal range of reinforcement in launching section is proposed and distribution characteristics of surface settlement are obtained. |
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| Keywords: | Railway tunnel Shield tunnel Slurry pressure balanced shield Tunneling under shallow overburden Numerical simulation Surface settlement |
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