我国铁路目前大部份采用碎石道床。线路石碴从疏松到密实,从脏污到干净,其实质就是单位体积石碴中间的空隙率的变化,钢轨下沉也与石碴空隙率的变化有直接关系。因此,如能采取科学的测试方法测得石碴的空隙率,对掌握道床技术状态、提高线路质量是很重要的。 我局在上海工业自动化仪表研究所和上海 At present, most of China’s railways use ballast beds. Line ballast from loose to dense, from dirty to clean, the essence is the unit volume of ballast in the middle of the porosity change, rail sinking and ballast porosity is also directly related to changes. Therefore, if we adopt the scientific test method to measure the porosity of ballast, it is very important to understand the technical condition of ballast bed and improve the quality of the line. I Bureau of Shanghai Institute of Industrial Automation Instruments and Shanghai