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问题1简单说明压实机械的种类及其工作原理.解答:土是由土粒子和在粒子中间的水分与空气组成.如果由外界对土施加一定压力,空气便会被挤压出来,使土的体积减小,密度增大,将这种作业称为压实.土能不能被充分压实,取决于此时水的含量.含水量少的土,由于土粒子间摩擦阻力大,会阻止粒子顺利移动,则很难压实.若适当增加含水量,由于水的润滑剂作用,便能充分压实.将这时的含水量称为最佳含水量.但是,含水量过大时,由于水占据了一定的间隙,相反会阻碍密度增加.如上所述,以增加外力为目的机械称为压实机械.压实机械按其工作原理可归纳为下列四种:(1)由转动滚子进行压实的机械(2)利用揉和作用进行压实的机械(3)利用振动作用进行压实的机械(4)利用冲击载荷进行压实的机械
Problem 1 A brief description of the type of compaction machine and how it works. Answer: Soil consists of soil particles and water and air in the middle of the particles. If some pressure is exerted on the soil by the outside world, the air is squeezed out and the soil Of the volume decreases, the density increases, this operation is called compaction.Earth can not be fully compacted, depending on the water content at this time.Water with low water content, due to friction between soil particles large, will prevent Particles move smoothly, it is difficult to compaction.If the appropriate increase in water content, due to the role of water lubricants, will be fully compacted .When the moisture content is called the best moisture content.However, when the water content is too large, As water occupies a certain gap, on the contrary will hinder the increase in density.As mentioned above, in order to increase the external force for the purpose of machinery known as the compaction machinery.Compaction machinery according to its working principle can be grouped into the following four: (1) by the rolling (2) Machines for compaction by kneading (3) Machines for compaction by vibration (4) Machines for compaction by impact load