摘要
为了研究大直径桥梁桩基础对水流的影响规律，采用计算流体力学（CFD）技术，计算分析桥梁桩基础引起的尾流流速分布及变化规律。结果表明：对于第1排桩基尾流流速分布，桩基中央区域及外缘的最大流速从C1到C2断面变化幅度最大，对于第2排桩基尾流流速分布，当桩基间距为2D时，随着沿程的增加，横向分布曲线逐渐变窄，并向w形分布过度，到C7断面时分布曲线由w形分布向U形分布转变，尾流最小流速较其它排列方式的最小流速还小；当桩基间距为3D、4D时，分布曲线从C6到C7断面逐渐由窄变宽，桩基中央区域及桩基外缘的峰值流速逐渐降低，尾流最小流速逐渐增大，断面流速差值逐渐缩小，但仍未恢复到无桩时的状态。
In order to study the influence law of large diameter bridge pile foundation on the water flow, use the computational fluid dynamics （CFD） technology to calculate and analyze the tail velocity distribution and variation law induced by the bridge pile foundation. The results show that： for the tail velocity distribution of the first row piles, the maximum velocity of the central region and the outer edge of the pile foun- dation varies the maximum amplitude from C1 to Cz section; for the tail velocity distribution of the second row piles, when the pile spacing is 2D, with the increase of along the process, the transverse distribution curve gradually become narrow, and to the W shape distribution, and the distribution curve shape distribution changes from w to U shape distribution at the C7 section, the minimum flow velocity of the tail velocity minimum is smaller than other arrangement; when the pile spacing is 3D or 4D, the distribution curve gradually changes from narrow to wide from C6 to C7 section, the peak velocity of the central region and the outer edge of the pile foundation gradually reduces, and the minimum velocity of the tail flow gradually increases, the velocity difference narrows gradually, but has not been restored to the state when no piles.
出处
《南水北调与水利科技》
CAS
CSCD
北大核心
2015年第B02期26-29,共4页
South-to-North Water Transfers and Water Science & Technology
基金
桥梁无损检测与工程计算四川省高校重点实验室资助项目（2013QYJ03）
关键词
桥梁桩基础
计算流体力学(CFD)技术
桩基间距
尾流流速
分布规律
bridge pile foundation
computational fluid dynamics （CFD） technology
pile foundation spacing
tail flow velocity
distribution law
