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苏联对于路基土的压实问题,曾进行过许多研究。他们根据若干经受过50—100年,甚至更多年考验的老填土中的密度的研究结果,以及试验室的许多比较试验,得出了对不同土类应采用不同锤击次数的结论。并规定各种土类的总锤击次数,可大致采用下列数值:砂土60次,亚砂土(砂质垆坶)75次,亚粘土(粘土质起坶)90次,粘土120次。同时说明,如必须确定最佳密度所需的总锤击次数时,可将土加水至最佳含水量,然后开始逐层逐次增加锤击次数,将土击实。锤击次数自30次开始,每次增加15—20次,直至所得土的容重与前者相差不大于0.03—0.05克/公分~3为止。这样就突破了美国普氏法对各种土类均锤击相同次数的机械规定,使标准压实试
The Soviet Union conducted many studies on the compaction of subgrade soils. Based on the results of studies on the density of several old fillings that have been tested for 50-100 years or more years and many comparative tests in the laboratory, they have come to the conclusion that different numbers of hammering should be used for different soil types. And the provisions of a variety of soil total hammer times, can be roughly the following values: sand 60 times, sandy soil (sandy 垆 坶) 75 times, 90 times the clay (质 clay 坶 坶) 90 times, 120 times clay. In the meantime, if the total number of hits required to determine the optimum density have to be determined, the soil can be filled with water to the optimum moisture content, and then the number of peening starts to increase one by one, layer by layer, to solidify the soil. Hammer the number of times from 30 times, each increase of 15-20 times, until the resulting soil bulk density with the former difference of not more than 0.03-0.05 g / cm ~ This broke through the Platts law in the United States on all kinds of soil hammering the same number of mechanical requirements, so that the standard compaction test