软弱围岩隧洞位移和应力释放规律研究

发布时间：2018-03-16 16:46

本文选题：软岩隧洞　切入点：数值试验　出处：《地下空间与工程学报》2017年03期 　论文类型：期刊论文

【摘要】：软弱围岩强度低、自稳能力差,在隧洞施工中易引起不同程度的塌方,造成生命财产的损失。因此,研究及时支护情况下软岩隧洞围岩的位移和应力释放规律显得尤为重要。笔者采用三维数值方法系统研究了隧洞开挖过程中的位移变化规律,并结合二维数值分析方案研究了围岩应力释放系数随工作面推进的关系。研究表明:(1)埋深、洞径和洞型等对拱顶位移释放系数影响较小,而岩性对其影响显著;(2)拱顶位移释放随应力释放变化过程大致可分为3个阶段,且岩性越差达到相同位移释放率时所需的应力释放率也越大;(3)研究断面前后一倍洞径是围岩应力调整的主要阶段,且应力释放率随岩性的弱化而增强;(4)初期支护对岩性较差的隧洞效果更明显。
[Abstract]:The weak surrounding rock has low strength and poor self-stability. It is easy to cause different degree of collapse in tunnel construction, resulting in the loss of life and property. It is very important to study the displacement and stress release of surrounding rock in soft rock tunnel under the condition of timely support. The relationship between the stress release coefficient of surrounding rock with the advance of the working face is studied with the two-dimensional numerical analysis scheme. The results show that the depth, diameter and shape of the tunnel have little influence on the displacement release coefficient of the arch roof. The process of displacement release with stress release can be divided into three stages. And the larger the stress release rate required when the lithology is worse to reach the same displacement release rate, the larger the stress release rate is.) the main stage of stress adjustment of surrounding rock is the double diameter of the tunnel before and after the research section. And the stress release rate increases with the weakening of lithology) the initial support is more effective for the tunnel with poor lithology.
【作者单位】：西安理工大学岩土工程研究所;新疆水利水电勘测设计研究院;西安科技大学建筑与土木工程学院;
【基金】：国家自然科学基金(51179153,51509200) 西安理工大学博士学位论文创新基金(310-11202J306) 西安科技大学培育基金(2014036)
【分类号】：TV554;U451

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