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一般认为泥浆在运动时候,它的力学性质已经有别于通常的牛顿流体而是宾汉体了.因此剪应力应该用宾汉体的剪应力关系式.本文作者则持另外一种见解.认为泥浆是一种接近于沥青一类的粘性极大,弛豫时间极长的流体.本文讨论了泥浆的力学性质,并且进一步讨论了圆球在泥浆中作匀速直线运动时所受到的阻力.在讨论过程中,我们利用了人们熟知的粘性流体绕圆球运动的Stokes解,得到了一个简单的阻力公式.当圆球在重力和浮力作用下在泥浆中作沉淀运动时候,我们求出了沉降速度.在沉降速度为零时候,我们就可以求出“不沉粒径”和“宾汉体极限剪应力”的关系.我们把计算结果得到的理论公式和陕西水科所及黄委会水科所等单位的实验数据进行了比较,结果是令人满意的.
It is generally believed that when the mud is in motion, its mechanical properties are different from the usual Newtonian fluid but Bingham body. Therefore, the shear stress should use the shear stress relationship of Bingham body. The author of this paper holds another opinion. Slurry is a kind of fluid with close viscosity and extremely long relaxation time close to that of asphalt. This paper discusses the mechanical properties of mud, and further discusses the resistance of spheres to uniform linear motion in mud. During the discussion, we used the well-known Stokes solution of the viscous fluid around the sphere to obtain a simple formula for the resistance. When the sphere was subjected to sedimentation in the mud under gravity and buoyancy, we calculated the settlement. Speed. When the settling velocity is zero, we can determine the relationship between “not sinking particle size” and “binning body’s ultimate shear stress.” We get the theoretical formula of the calculation result and Shaanxi Institute of Water Science and Yellow River Water The comparison of the experimental data of Kesuo and other units shows that the results are satisfactory.