摘要
为验证将新型冲刷防护装置"模袋浮板"运用于管道冲刷的防护效果,建立了主流-渗流耦合模型,模拟单向流作用下管道附近的主流场和渗流场,验证了模袋浮板装置的有效性,研究了模袋浮板装置各设计参数对防护效果的影响。模拟结果显示,安装在管道上游的模袋浮板能显著降低管道附近的水流流速,降低土体中的渗流水头梯度,使管道受到有效保护。土体中的渗流水头梯度随浮板倾角的增大而减小,随悬空高度比的增大而增大,随浮板高度的增大而减小。渗流水头梯度与模袋浮板的有效高度呈非线性负相关关系,当有效高度超过临界值时,管道下方出现与主流方向相反的渗流。
Geotextile mattress with sloping plate(GMSP),a new countermeasure for scouring control,was introduced for scouring protection below underwater pipeline.A flow-seepage coupling model was established for the simulation of flow field and seepage field adjacent to the pipeline in a steady current.The protection effect of GMSP on a pipeline was validated.The influence of GMSP design parameters on the protection effect was also investigated.The results showed that GMSP is capable of decreasing the flow velocity near the pipeline and the seepage gradient below it,thus protecting the pipeline from the scouring.The seepage gradient reduces as the sloping angle of the plate and the plate height increase,and increases as the sand-pass opening increases.The result indicated a negative non-linear correlation between the seepage gradient and the effective plate height.When the effective plate height is over a critical value,the seepage flow under the pipeline reverses,i.e.in the opposite direction of the mainstream.
作者
朱晔慧
谢立全
ZHU Yehui;XIE Liquan(College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《人民长江》
北大核心
2019年第1期176-183,共8页
Yangtze River
基金
国家自然科学基金面上项目(51479137)
关键词
冲刷防护
模袋浮板
渗流
水头梯度
海底管道
scouring protection
geotextile mattress with sloping plate
seepage
water head gradient
seabed pipeline
