研究目的: 为进一步探索高地应力软岩隧道大变形控制技术,本文以某隧道强风化炭质板岩段为研究背景,通过数值模拟和现场试验两种方式,对三台阶法(工况1)和超前导洞扩挖法(工况2)两种方案的大变形控制效果进行对比分析。
研究结论: (1)数值模拟与现场试验具有较高的一致性;(2)从隧道变形控制效果来看,工况2的最大变形量相较于工况1减小了10%左右,减小幅度较小,工况1和工况2的最大变形量远小于隧道预留变形量,两个方案控制变形的效果很明显;(3)从施工效率来看,工况2相较于工况1增加了导洞的开挖与支护,施工效率降低了23.07%;(4)综合变形控制效果与施工效率,推荐该隧道强风化炭质板岩段采用三台阶法施工;(5)本研究结果可为强风化炭质板岩隧道工程提供参考和借鉴。
Abstract
Research purposes: In order to further explore the large deformation control technology of soft rock tunnel with high in-situ geostress, this paper takes the strongly weathered carbonaceous slate section of a tunnel as the research background. Through numerical simulation and field test, the large deformation control effects of the three step method (working condition 1) and the advanced pilot tunnel expansion method (working condition 2) are compared and analyzed.
Research conclusions: (1) Numerical simulation and field test have high consistency. (2) From the tunnel deformation control effect, the maximum deformation of working condition 2 is reduced by about 10% compared with working condition 1, and the reduction is small. The maximum deformation of working condition 1 and working condition 2 is far less than the reserved deformation of the tunnel. The deformation control effect of the two working conditions is very obvious. (3) From the perspective of construction efficiency, compared with working condition 1, working condition 2 increases the excavation and support of pilot tunnel, and the construction efficiency is reduced by 23.07%. (4) From the perspective of comprehensive deformation control effect and construction efficiency, it is recommended that the strongly weathered carbonaceous slate section of the tunnel should be constructed by the three-step method. (5) The research results can provide reference for strong weathered carbonaceous slate tunnel.
关键词
高地应力 /
炭质板岩 /
大变形 /
开挖工法 /
隧道工程
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Key words
high geostress /
carbonaceous slate /
large deformation /
excavation method /
tunnel engineering
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中图分类号:
U45
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脚注
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基金
国家自然科学基金项目(51408008)
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