沉管隧道管节沉放过程中河流环境对管节附加压力的影响分析

发布时间：2018-03-06 11:15

本文选题：隧道工程　切入点：沉管隧道　出处：《岩石力学与工程学报》2014年S1期 　论文类型：期刊论文

【摘要】：管节在沉放过程中受河流环境影响较大,现运用计算流体力学方法,数值实现管节在不同流速、水位等河流工况下沉放的全过程,得出沉管隧道管节下沉过程中管节侧壁的附加压强等数据。分析结果表明:在管节下沉过程中,管节一半进入基槽时为特殊位置,此时上下、左右压力差值出现较大波动;左右侧压力差作用点上移,上下面最小压力差作用点之间的距离随管节沉放达到最大,此时管节在上下面作用力下受到的弯矩最大;河流水位对管节侧壁附加压力影响不显著,对最大压力差作用点位置产生对应的提前、延缓;河流流速对侧壁附加压力差影响显著,得出管节进入特殊位置前后管节侧壁压强差值变化梯度与河流速度的关系,并给出拟合曲线。该分析结果可为管节沉放提供借鉴。
[Abstract]:The pipe joints are greatly affected by the river environment in the course of sinking. In this paper, using the method of computational fluid dynamics (CFD), the whole process of pipe node sinking and releasing under different flow velocity and water level is realized numerically. The additional pressure and other data of the side wall of the pipe joint during the sinking process of the immersed pipe tunnel are obtained. The analysis results show that in the course of the pipe node sinking, the half of the pipe node is in a special position when it enters the base groove, and the pressure difference between the left and the right is fluctuated greatly at this time. The distance between the upper and lower minimum pressure difference points reached the maximum with the sinking of the pipe joint, and the moment of the pipe joint was the largest under the upper and lower forces, while the river water level had no significant effect on the additional pressure on the side wall of the pipe joint. The influence of river velocity on the additional pressure difference of side wall is significant, and the relationship between the gradient of pressure difference of side wall and river velocity before and after the pipe node entering a special position is obtained. The fitting curve is given. The results can be used for reference.
【作者单位】：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金资助项目(51108190) 华南理工大学亚热带建筑科学国家重点实验室自主研究课题资助项目(2012ZC27)
【分类号】：U455.46

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