空隙率对钢筋石笼拖曳系数的影响研究

The Influence of Void Ratio on the Drag Coefficient of Reinforced Gabion

拖曳力系数是研究块体在水流作用下稳定性的重要参数,以往的研究较少考虑空隙的影响。建立了水流作用下具有一定空隙率的正六面体钢筋石笼稳定性的数值计算模型,并通过物理模型试验进行了验证,证明其具有较好的计算精度。在此基础上,通过对不同空隙率的钢筋石笼的计算表明:空隙率越大,拖曳力系数越小,钢筋石笼稳定性越好。拟合得到了拖曳力系数与空隙率之间的关系式,对常用的起动流速公式进行了修正,并得到了物理模型的验证,可用于正六面体钢筋石笼的抗冲稳定计算。

Drag force coefficient is an important parameter to study the stability of block under the action of water flow.Previous studies have not considered the effect of void.In this paper,a numerical model for calculating the stability of cubic reinforcement cages with voids under the action of water flow is established,and verified by the results of the physical model.It is proved that it has good calculation accuracy.On this basis,the calculation of reinforced concrete cages with different voids shows that the larger the void ratio is,the smaller the drag force coefficient is and the better the stability of the reinforced stone cage is by fitting the relationship between drag force coefficient and void ratio.It modifies the commonly used formula of starting velocity,and has been verified by the physical model.And it can be used to calculate the impact stability of hexahedron reinforced concrete cages.