土的击实试验影响因素

击实试验是土木工程中不可缺少的试验项目,对击实标准、试样制备、润滑剂、余土高度及土的重复使用5个影响击实成果的因素做了对比试验;同时,对试验结果进行了分析.通过土的击实影响因素对比试验,得出如下结论：随着击实功的增加,最大干密度增大,最优含水量反而减小;土样应采用未使用过的天然土或风干土制备,不允许采用使用过的土进行击实试验;余土高度应控制在4 mm之内;在击实试验中,应在击实筒及护筒内壁均匀地抹上一薄层凡士林,这些研究成果对击实原理的研究及击实试验均有一定的指导作用.

Influential factors of compaction test of soil

Compaction test is an indispensable experiment in civil engineering. This paper does some comparable experiments on influential factors of compaction test from the standard of compaction, soil kind, lubricating oil, the height which exceeds the height of tubeshaped objct and reused soil. At the same time the paper does also analyse results of comparable experiments. By comparable experiments which are done on influential factors of compaction, it is obtained that the maximum dry density increases while the best moisture content decreases with increasing the real hitting work; that the soil kind adopts natural soil or air-dried soil not reused and not allowing to adopt the soil used in compaction test; that the height which exceeds the height of tube-shaped objeci is less than 4 mm; that there is a thin layer petrolatum which is wiped on inboard wall of the real hit tube and protect tube. These positive results play a guiding role on compaction principle and test.