| 下穿既有地铁盾构区间的矿山法隧道核心土优化分析 |
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| 引用本文： | 宗长江.下穿既有地铁盾构区间的矿山法隧道核心土优化分析[J].中南公路工程,2014(3):29-33. |
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| 作者姓名： | 宗长江 |
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| 作者单位： | 中铁二十局集团有限公司,陕西西安710016 |
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| 基金项目： | 国家科技支撑计划（2012BAG05B00）; 河北省高等学校自然科学青年基金项目（2011250） |
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| 摘 要： | 在穿越工程中,通常采用预留核心土技术控制隧道开挖过程中掌子面的稳定和变形。结合北京地铁6号线下穿既有盾构区间的矿山法隧道施工实例,对预留核心土的纵向长度和横向尺寸效应进行优化分析。研究结果表明：掌子面稳定性与其核心土高度成正比,而核心土纵向长度取0.5倍洞跨、上下底宽度比为2/3时利于掌子面稳定,其结论可供类似工程参考。
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| 关 键 词： | 盾构区间 下穿 矿山法 核心土 优化 |
Optimization Analysis of Core Soil of Mined Tunnel Crossing under the Existing Shield Tunnel |
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| ZONG Changjiang.Optimization Analysis of Core Soil of Mined Tunnel Crossing under the Existing Shield Tunnel[J].Central South Highway Engineering,2014(3):29-33. |
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| Authors: | ZONG Changjiang |
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| Institution: | ZONG Changjiang (China Railway 20th Bureau Group Corporation,Xi＇ an, Shanxi 710016, China) |
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| Abstract: | Technology of core soil was used to maintain excavation face stability and deformation during crossing engineering. Based on the engineering practices of beijing subway NO. 6 line with the mine tunneling method undererossing the existing shield interval of NO. 4 subway line. Optimiazation analysis of core soil of longitudinal length and horizontal size effect has been studied. The study show that the stability of core soil was proportional to it＇ s height, the reasonable longitudinal length was 0.5 times tunnel span and the ratio of top and bottom width was 2/3. The conclusion provides a good reference to similar works. |
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| Keywords: | shield interval undercrossing mine tunneling method core soil optimizaton |
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