辽宁省普通公路桥墩抗冲刷防护形式数值模拟  

Numerical Simulation Study of Anti-Erosion Protection Form of Bridge Piers of Ordinary Highway in Liaoning Province

作　　者：张敏江[1] 周兴[1] 李依默[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2013年第3期440-445,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(40673045);辽宁省交通厅科研项目(201112)

摘　　要：目的探讨桥墩圆形石笼防护和矩形石笼防护对流场造成的影响,进而判断出何种防护形式更适合作为桥墩防护结构.方法采用GAMBIT软件建立计算模型,之后采用流场分析软件FLUENT,运用VOF方法对圆形石笼防护和矩形石笼防护进行数值模拟分析,从水流流速、动压力、河床剪切力、紊流强度四个方面进行研究.结果矩形石笼防护对流场的影响非常大,而且矩形石笼的阻水效果非常明显,这会影响水流的流势和河床的稳定,圆形石笼防护也有阻水效应,但是这种效应造成的影响较小.结论数值模拟分析发现圆形石笼防护更为合理,更加适合对桥墩进行防护.通过实际工程验明桥墩处采用圆形石笼防护可有效保护桥墩.Investigate the effect of the circular-gabion protection and the rectangular-gabion protection on the flow field, then we can determine which type of protection is more suitable as a protection structure of bridge pier. In this article, we will set up the computing models by using the software of GAMBIT, and then the flow field analysis software FLUENT and the method of VOF are applied to the numerical simulation analy- sis of the circular-gabion protection and the rectangular-gabion protection. Mainly from four aspects to carry on the research analysis, which include the flow velocity, the dynamic pressure, the bed shear stress and the turbulence intensity. Through a comparative analysis, the effect of the rectangular-gabion protection on the flow field is very large and the water blocking effect of the rectangular-gabion protection is very obvious, which will affect the water flow potential and the stability of the riverbed. The circular-gabion protection also has the water blocking effect, but its influence is very small. Through the numerical simulation analysis, we understand that the circular-gabion protection is more suitable as a protection structure of bridge pier. Through the implementation of actual project, we find out that the protective effect of the circular-gabion protection is really good and it effectively protects the bridge pier.

关 键 词：桥墩防护 石笼 数值模拟 速度场 动压力 剪切力 紊流强度 

分 类 号：U442.32[建筑科学—桥梁与隧道工程]