基于多因素评价的隧道围岩质量与超欠挖关系

发布时间：2018-06-05 03:44

本文选题：隧道工程 + 围岩质量　；参考：《岩土力学》2014年11期

【摘要】：围岩质量及施工方法是影响隧道超欠挖的本质原因,研究围岩质量与超欠挖的关系,对评价和预测超欠挖、判断隧道结构的稳定性具有重要意义。基于工程实测资料及数值试验,研究了跨度对隧道围岩质量的影响,进而建立了基于多因素评价的围岩质量修正指标。根据隧道开挖断面轮廓具有分形特征的特点,计算了鸳鸯会隧道20个典型断面轮廓分形维数,研究了围岩质量与超欠挖的关系,得出围岩质量多因素修正指标与超挖比及断面轮廓分形维数呈线性关系,随着围岩质量多因素修正指标的提高,超挖比和断面轮廓分形维数将降低,并根据复相关原理,建立了三者间的复相关关系,可为隧道围岩质量的正确评价及超欠挖分析提供有益参考。对比不同围岩分级方法与超欠挖的关系表明,基于多因素评价的BQ法在隧道工程中的适用性更好。
[Abstract]:The quality of surrounding rock and the construction method are the essential reasons that affect the over-underexcavation of the tunnel. It is of great significance to study the relationship between the quality of surrounding rock and the over-underexcavation, to evaluate and predict the over-underexcavation and to judge the stability of tunnel structure. Based on the measured data of engineering and numerical test, the influence of span on the quality of surrounding rock mass of tunnel is studied, and the correction index of surrounding rock quality based on multi-factor evaluation is established. According to the fractal characteristic of the section profile of tunnel excavation, the fractal dimension of 20 typical sections of Yuanyanghui tunnel is calculated, and the relationship between the mass of surrounding rock and over-excavation is studied. It is concluded that the multifactor correction index of surrounding rock mass is linearly related to the overbreak ratio and fractal dimension of cross-section profile. With the increase of multi-factor correction index of surrounding rock mass, the overbreak ratio and fractal dimension of cross-section profile will be reduced, and according to the principle of complex correlation, The complex correlation between them can provide a useful reference for the correct evaluation of the surrounding rock quality and the analysis of over-underexcavation. Comparing the relationship between the classification method of surrounding rock and over-underexcavation, it is shown that the method based on multi-factor evaluation has better applicability in tunnel engineering.
【作者单位】：北京科技大学土木与环境工程学院;世茂房地产控股有限公司;
【基金】：长江学者和创新团队发展计划资助项目(No.IRT0950) 国家自然科学基金(No.51074014)
【分类号】：U451.2

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