研究目的:现阶段我国城市地铁建设呈现出地质环境复杂化趋势,亟需解决复杂地质条件下地铁隧道盾构设备选型难题,需根据水文地质环境确立盾构/TBM双模掘进设备选取原则,同时提出兼顾项目工期与造价的区间模式修正公式,本文基于深圳地铁14号线区间隧道工程,分析TBM及土压模式在微、中风化角岩中的实际掘进速率,验证双模盾构在复合地层的掘进适应性。
研究结论:(1)基于水文地质条件的双模盾构/TBM选型,需根据地层参数差异程度确定是否选取双模式,再结合单模盾构选型原则及地层参数进行区段模式判定,同时考虑沿线其他不良地质条件;(2)深圳地铁14号线布吉站—石芽岭站区间地层全断面硬岩、软岩不均段、软土段比例为5:3:2,结合盾构/TBM选型原则建议采用土压/TBM双模盾构;(3)基于工期及造价确定微、中风化岩层转换下限长度并进行区段模式修正;(4)本研究结论可为地铁区间隧道盾构/TBM双模掘进设备的选取提供具体流程及方法。
Abstract
Research purposes:China′s metro construction presents the trend of geological environment complexity, so it is urgent to solve the problem of metro tunnel shield equipment selection under complex geological conditions. It is required to establish the selection principles according to the hydro-geological environment for shield/TBM dual-mode excavation equipment, while proposing a correction function for the interval mode of both project duration and cost. Based on the interval tunnel project of Shenzhen Metro Line 14, this paper analyzes the actual tunnelling speed of TBM and earth pressure mode in micro and medium weathered stratum and verifies the adaptability of dual-mode shield tunnelling in the composite stratum.
Research conclusions:(1) For the selection of dual-mode shield/TBM based on geological conditions, it is necessary to determine whether to select dual-mode according to the difference of stratum parameters and determine the section mode by the selection principle of single-mode shield, while considering other adverse geological conditions along the line. (2) The proportion of hard rock, soft rock uneven section and soft soil section in the whole section of the Buji-Shiyaling section of Shenzhen Metro Line 14 is 5 ∶3 ∶2. Combined with the selection principle of shield/TBM, it is suggested to adopt the earth pressure/TBM dual-mode shield TBM. (3) Based on the construction period and cost, the limit length of the transition of the slightly and moderately weathered strata is determined, and the section mode is modified. (4) The research results can provide the specific processes and methods for the selection of shield /TBM dual-mode tunneling equipment in metro tunnel.
关键词
隧道工程 /
复合地层 /
双模盾构/TBM /
模式选取 /
掘进适应性
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Key words
tunnel engineering /
composite stratum /
dual-mode shield/TBM /
mode selection /
tunneling adaptability
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中图分类号：
U455
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参考文献
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脚注
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基金
国家重点研发计划(2016YFC0802201);国家自然科学基金面上项目(51578461)
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