| 陶鼎,李大华,贺瑞,孟俊霞.黄土隧道围岩特性曲线及其数值计算方法[J].安徽建筑大学学报,2020,28(1):14-18 |
| 黄土隧道围岩特性曲线及其数值计算方法 |
| CHARACTERISTIC CURVE OF SURROUNDING ROCK OF LOESSTUNNEL AND ITS NUMERICAL CALCULATION METHOD |
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| DOI：10.11921/j.issn.2095-8382.20200103 |
| 中文关键词: 隧道工程 约束收敛法 围岩特性曲线 数值模拟 |
| 英文关键词: tunnel engineering constrained convergence method characteristic curve of surrounding rock numerical simulation |
| 基金项目:国家自然科学基金青年科学基金项目(41906168)。 |
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| 中文摘要: |
| 隧道围岩体系与支护体系的相互作用是隧道工程研究的核心问题。对于黄土隧道而言，基于约束收
敛法分析围岩变形规律，进而对围岩稳定性进行评价是一种黄土隧道研究的新方向新思路。本文基于FLAC3D
大型通用有限差分软件，采用双线性应变软化遍布节理模型模拟黄土垂直节理特性，对三种不同弹性模量下
大断面黄土隧道进行模拟并详细给出围岩特性曲线的数值求解方法。结果表明，在求解复杂边界条件下围岩
特性曲线推荐采用数值计算的方法，本文采用的反向荷载计算法能有效地求解复杂围岩条件下黄土隧道的围
岩特性曲线。随着位移的增加，也就是支护时机的推后，所需要的支护力在逐渐减小，围岩自承的荷载比重
在增大。随着黄土隧道围岩弹性模量的增大，隧道拱顶在达到相同位移所需要的支护力在减小，说明围岩条
件较好的时候可以适当减小支护强度。 |
| 英文摘要: |
| The interaction between the surrounding rock system and the support system is the core of the tunnel engineering
research. For loess tunnel，it is a new way to analyze the deformation law of surrounding rock based on constraint
convergence method，and then evaluate the stability of surrounding rock. In this paper，based on FLAC3D large-scale
general finite difference software，bilinear strain softening ubiquitous joint model is used to simulate large section loess
tunnel of high-speed railway，and the numerical solution method of surrounding rock characteristic curve is given in detail.
The results show that the numerical calculation method is recommended to solve the characteristic curve of surrounding
rock under complex boundary conditions，and the reverse load calculation method adopted in this paper can effectively
solve the characteristic curve of surrounding rock under complex surrounding rock conditions. |
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