期刊文献+

巷道开挖围岩应力时空效应研究 被引量:1

Study on Temporal and Spatial Effect of Surrounding Rock Stress in Roadway Excavation
下载PDF
导出
摘要 围岩应力状态是巷道开挖支护的控制因素,具有显著的应力松弛效应与开挖面空间效应。围绕巷道开挖围岩应力演化过程,采用Burgers黏弹性流变模型,初步解析了围岩环向、轴向与径向应力分布的时空效应问题,并探讨了时间、空间以及蠕变参数相关性。结果表明:采用Burgers模型能充分反映围岩应力松弛效应,三向应力均随时间推移而迅速降低直至稳定于某一平衡状态;围岩力学松弛行为是时间和空间的函数,环向应力随开挖面后方距离增大而增大,径向应力刚好相反,而轴向应力保持不变;在应力松弛初期,环向应力下降的速度明显大于轴向应力与径向应力。该研究可为岩体巷道工程稳定性预测以及加固分析提供理论基础。 The stress state of surrounding rock, which has a significant stress relaxation effect and a prominent tunnel face effect, is the controlling factor in terms of the lining installation. Surrounding the stress evolution process of rock around an advancing circular tunnel, the Burgers model is utilized to calculate stress distribution in the circumferential, axial and radial direction. The sensitivity analysis of the related parameters is carried out in association with the time - space effects as well as the rheological effect. The result shows that the Burgers model can fully reflect the rock stress relaxation effect, and surrounding rock stress declines rapidly with time elapses,ultimately stables at a balanced state;the mechanical relaxation behavior of surrounding rock is a time - space function, the hoop stress increases with the distance from the tunnel face increase, but on the contrary, the radial stress decreases with increasing the distance from the tunnel face, then the axial stress remains constant;prior to the stress relaxation, the descent rate of the hoop stress is significantly greater than that of the axial stress and the radial stress. This study can provide an advance theoretical basis for the stability prediction and the reinforcement analysis for the rock tunnel engineering.
作者 庞金昌 PANG Jin-chang(College of Architecture and Civil Engineering,Nantong Institute of Technology,Jiangsu Nantong 226000,Chin)
出处 《贵阳学院学报(自然科学版)》 2017年第3期70-73,共4页 Journal of Guiyang University:Natural Sciences
关键词 巷道开挖 应力松弛 BURGERS模型 开挖面空间效应 应力释放 Tunnel excavation Stress Relaxation Burgers model The face effects Stress release
  • 相关文献

参考文献8

二级参考文献108

共引文献680

同被引文献6

引证文献1

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部