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

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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。

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关键词 ：隧道工程, 沉管隧道, 管节沉放, 河流环境, 附加压力, 数值模拟

Abstract：The tube section was influenced obviously by the river environment in the process of tube immersing. The additional pressure of the tube sidewall during the tube immersing can be obtained from numerical simulation on different river environments by computational fluid dynamics method. The analytical results show that when half tube is immersed in foundation trench at the particular moment，the difference of pressure around the tube surfaces changes significantly. Position of the left-right maximum differential pressure raises around the side，while the position of upper-lower maximum differential pressure reaches maximum as the tube is immersed. The river level has no effect on the additional pressure，and the location of the maximum pressure differential point scrolls horizontally. The river flow velocity has a great influence on sidewall additional pressure，and the relationship between the maximum difference in gradient and the river flow velocity near special place can been obtained. The analysis results can provide valuable reference for similar projects.

Key words： tunneling engineering immersed tube tunnel tube immersing river environment additional pressure numerical simulation

收稿日期: 2013-08-13

引用本文:

莫海鸿1，2，李亚东1，2，陈俊生1，2. 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[J]. 岩石力学与工程学报, 2014, 33(sl): 2971-2976.
MO Haihong1，2，LI Yadong1，2，CHEN Junsheng1，2. ANALYSIS OF INFLUENCE OF RIVER ENVIRONMENT ON ADDITIONAL PRESSURE OF TUBE SIDEWALL DURING TUBE IMMERSING. , 2014, 33(sl): 2971-2976.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/2971

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