隧道出口洞门护坡对微气压波的影响

发布时间：2018-03-20 19:28

本文选题：护坡斜率　切入点：护坡面积　出处：《中南大学学报(自然科学版)》2014年10期 　论文类型：期刊论文

【摘要】：以动模型试验验证为基础,采用三维、可压缩、非定常N-S方程和k-ε双方程湍流模型,对隧道出口不同护坡条件下的微气压波进行数值模拟。研究得到端墙式隧道洞门条件下隧道出口护坡对微气压波的影响规律。研究结果表明:当护坡面积小于9倍隧道净空面积时,随着护坡面积的增加,微气压波幅值明显增大,当护坡面积大于9倍隧道净空面积时,隧道出口20 m处监测点微气压波不再随着护坡面积的增大而改变。当护坡由竖直变化至斜切斜率为1:1.125之间时,随着斜切斜率的减小,微气压波幅值线性降低,当护坡斜率减小为1:1.125时,隧道出口20m处微气压波幅值将稳定在82Pa左右,之后不再随护坡斜率减小而变化。
[Abstract]:In the dynamic model test as the basis, using three-dimensional, compressible, unsteady N-S equation and k- turbulence model, the exit of the tunnel slope under the condition of different micro pressure wave by numerical simulation. On influence of tunnel exit slope end wall tunnel portal under the condition of micro pressure wave results. Show that when the slope area is less than 9 times the tunnel clearance area, with the increase of slope area, the amplitude of the micro pressure wave increases, when the slope area is more than 9 times the headroom area of the tunnel, the tunnel exit 20 m monitoring points of the micro pressure wave with the increase of slope area no longer change. When the slope changes from vertical to oblique slope for 1:1.125, with the decrease of cutting slope, the amplitude of the micro pressure wave decreases linearly. When the slope slope decreased at 1:1.125, 20m at the tunnel exit amplitude of the micro pressure wave will stabilize at around 82Pa, with no longer Slope slope decreases and changes.

【作者单位】：中南大学交通运输工程学院轨道交通安全教育部重点实验室;
【基金】：中南大学研究生自主探索创新项目(2013zzts041) 高速铁路基础研究联合基金重点资助项目(U1134203) 中南大学教师研究基金资助项目(2013JSJJ014)~~
【分类号】：U453.1

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