基于强度折减法的隧道围岩稳定性研究
发布时间：2018-08-08 19:51
【摘要】：围岩的稳定是地下工程支护结构稳定的关键,本文围绕围岩稳定性分析开展了一系列研究。首先针对地下工程围岩的地质历史特征,使用能够反映开挖扰动影响的Hoek-Brown准则作为岩体力学参数的估算方法,并基于隧道围岩次生应力分布及其松动失稳机制,提出了基于隧道拱顶下沉变形位移突变的围岩失稳判据;然后,通过将强度折减法与失稳判据相结合,建立了围岩自支护结构稳定的安全系数分析方法;最后,通过采用正交试验设计,并采用FLAC软件,对影响隧道围岩结构稳定安全系数的基本因素进行了敏感性分析。计算结果表明,地质强度指标起到关键控制作用,其余依次是开挖扰动因子、岩块单轴抗压强度、隧道埋深及跨度。
[Abstract]:The stability of surrounding rock is the key to the stability of support structure in underground engineering. Firstly, according to the geological and historical characteristics of surrounding rock of underground engineering, the Hoek-Brown criterion, which can reflect the influence of excavation disturbance, is used as the estimation method of rock mass mechanics parameters, and based on the distribution of secondary stress and the mechanism of loosening and instability of tunnel surrounding rock. Based on the sudden change of deformation displacement of tunnel arch roof, the failure criterion of surrounding rock is put forward, and then, by combining the strength reduction method with the criterion of instability, the safety factor analysis method for the stability of surrounding rock self-supporting structure is established. By using orthogonal test design and FLAC software, the sensitivity analysis of the basic factors affecting the stability and safety factor of surrounding rock structure is carried out. The calculation results show that the geological strength index plays a key role in controlling, and the others are the excavation disturbance factor, the uniaxial compressive strength of the rock block, the buried depth and the span of the tunnel.
【作者单位】： 湖南大学岩土工程研究所;
【基金】：国家自然科学基金项目(51078136) 深部岩土力学与地下工程国家重点实验室开放基金项目(SK LGDUEK0915)
【分类号】：U451.2
[Abstract]:The stability of surrounding rock is the key to the stability of support structure in underground engineering. Firstly, according to the geological and historical characteristics of surrounding rock of underground engineering, the Hoek-Brown criterion, which can reflect the influence of excavation disturbance, is used as the estimation method of rock mass mechanics parameters, and based on the distribution of secondary stress and the mechanism of loosening and instability of tunnel surrounding rock. Based on the sudden change of deformation displacement of tunnel arch roof, the failure criterion of surrounding rock is put forward, and then, by combining the strength reduction method with the criterion of instability, the safety factor analysis method for the stability of surrounding rock self-supporting structure is established. By using orthogonal test design and FLAC software, the sensitivity analysis of the basic factors affecting the stability and safety factor of surrounding rock structure is carried out. The calculation results show that the geological strength index plays a key role in controlling, and the others are the excavation disturbance factor, the uniaxial compressive strength of the rock block, the buried depth and the span of the tunnel.
【作者单位】： 湖南大学岩土工程研究所;
【基金】：国家自然科学基金项目(51078136) 深部岩土力学与地下工程国家重点实验室开放基金项目(SK LGDUEK0915)
【分类号】：U451.2
【参考文献】
相关期刊论文 前9条
1 张永兴;胡居义;何青云;王桂林;;基于强度折减法小净距隧道合理净距的研究[J];水文地质工程地质;2006年03期
2 谭代明;漆泰岳;莫阳春;;考虑时空效应的软弱围岩隧道施工稳定性研究[J];水文地质工程地质;2009年04期
3 陈星;李建林;;基于ADINA、ANSYS、FLAC的强度折减法[J];水文地质工程地质;2010年03期
4 吴梦军;张永兴;刘新荣;李p樛，
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