直墙式黄土隧道围岩结构的地震动稳定性分析——底脚处应力集中对安全系数的影响

程选生;田瑞瑞;郑颖人

振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 214-218,.

PDF(1542 KB)
PDF(1542 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 214-218,.
论文

直墙式黄土隧道围岩结构的地震动稳定性分析——底脚处应力集中对安全系数的影响

  • 程选生1,2; 田瑞瑞1; 郑颖人2
作者信息 +

Earthquake wall rock stability analysis of vertical ridge loess tunnel——the impact of stress concentration at the feet of tunnel on the safety factor

  • Cheng Xuan-sheng1,2; Tian Rui-rui1; Zheng Ying-ren2
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文章历史 +

摘要

为了验证直墙式黄土隧道(洞)底脚处应力集中现象对围岩结构安全系数的影响,根据静力和动力分析模型,应用抗剪强度折减法和ANSYS软件,在现有研究的基础上,分析了底脚为直角时重力和地震作用下塑性区和安全系数的变化规律,并通过数值算例,研究了底脚为不同半径圆弧时围岩结构安全系数的变化情况。结果表明:在重力作用下塑性区最先出现在底脚偏上,直角的应力集中现象对围岩结构安全系数没有影响,地震作用下塑性区虽然最先出现在底脚处,但安全系数的降低并非底脚处应力集中现象的影响,从而为以后工程结构中直墙式隧道(洞)的成型和工程应用提供了理论依据。

Abstract

In order to verify the impact of stress concentration phenomenon at the feet of vertical ridge loess tunnel (hole) on the rock structure safety factor, in this paper, according to the static and dynamic analysis model, and using the shear strength reduction method and the ANSYS software, and being based on the existing study results, the change laws of plastic zone and safety factor are analyzed under the action of gravity and seismic when the angles are right at the feet of vertical ridge loess tunnel (hole), and through numerical examples the change laws of rock structure safety factor are studied when the angles are arc that the radius is different. The results shows that: the plastic zone under the gravity action firstly appears at upper foot of vertical ridge loess tunnel (hole), the stress concentration phenomenon of right angle has no effect on wall rock safety factor, and the plastic zone under earthquake action firstly appear at the right foot of vertical ridge unlined loess tunnel (hole), but the decrease of safety factor is’ t the reason of stress concentration phenomenon. And so a theory basis will be provided for the loess tunnel forming and engineering application.

关键词

地震 / 直墙式黄土隧道 / 围岩结构 / 稳定性分析 / 应力集中 / 结论

Key words

earthquake / vertical ridge loess tunnel / wall rock / stability analysis / stress concentration phenomenon / result

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导出引用
程选生;田瑞瑞;郑颖人. 直墙式黄土隧道围岩结构的地震动稳定性分析——底脚处应力集中对安全系数的影响[J]. 振动与冲击, 2011, 30(11): 214-218,
Cheng Xuan-sheng;Tian Rui-rui;Zheng Ying-ren. Earthquake wall rock stability analysis of vertical ridge loess tunnel——the impact of stress concentration at the feet of tunnel on the safety factor[J]. Journal of Vibration and Shock, 2011, 30(11): 214-218,

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