近年来,公路由于重型车辆通行,且交通量日益增大;机场由于机型越来越大,铁路也向重载方向发展。为使公路、机场道面和铁路基床不遭破坏。延长使用寿命,保证运营安全,对土基填筑的密实度的要求越来越高。过去常用的静力压实机械往往不能胜任。近年来,国内外各种型号的振动压路机相继生产出来,并广泛应用于填土工程压实工作中。这种机械化施工,速度快、效率高。使用传统常规检测手段控制填土压实密实度,与施工速度很不适应。国内外近年先后又研制生产了核子仪器,用以快速测定土的压实密实度。我们对土 In recent years, due to the passage of heavy vehicles on the highway, and the increasing traffic volume, the airport has grown in heavy load due to the increasing number of models. In order to make the road, the airport pavement and the railway bed not be damaged. Extend the service life, ensure the safety of operation, and the requirement for the density of earth-based filling is getting higher and higher. In the past often used static compaction machinery can not be competent. In recent years, various types of domestic and foreign vibration roller have been produced, and is widely used in filling compaction work. This mechanized construction, speed, high efficiency. The use of traditional conventional means of control compaction compaction compaction, and the construction speed is not adapted. In recent years, both at home and abroad have also developed and produced nuclear instruments for the rapid determination of compacted compaction of soil. We are on earth