EXPLICATION OF THE MECHANIZM OF SOIL COMPACTION AND ITS APPLICATION TOCONSTRUCTION

通过对振动压实过程中土体致密化机理的探讨，研究了一种有效的土体压实方法。(1)振动荷载作用下土粒特性试验研究。通过试验研究了振动引起的土粒堆积现象。在实验中，煤颗粒受到振动载荷的作用，并在振动过程中测量其电导率。煤颗粒的电阻取决于每个颗粒之间的接触条件，即当颗粒之间的接触因振动载荷引起颗粒松动而消失时，电阻就会增加。研究了颗粒间电阻、振动条件、颗粒尺寸之间的关系，讨论了颗粒在振动过程中的行为。(2)用激振器进行模型试验，研究激振器的压实效果与其振动条件的关系。实验中，小型激振器在模型地基上振动，测量了激振器在地基上产生的密实力。讨论了密实力与激振器振动条件的关系。(3)振动压路机现场试验对模型试验结果进行了现场试验验证。根据(1)-(3)的研究结果，讨论了振动荷载作用下土体压实的机理，并指出了每种地基条件下的最佳振动频率的存在性。在此基础上，研究了最佳振动条件的确定方法。

Following studies were carried out to develop an efficient method for soil compaction through the discussion of the mechanism of the soil densification in vibratory soil compaction.(1)Experimental studies on the behavior of the soil particles under the vibrating load.Experiments were carried out to study on the packing phenpmenon of the soil particles induced by the vibration. In the experiments, the coal particles were subjected by the vibration load and its electrical conductivity was measured during vibration. Electrical resistance of the coal particles depends on the contact conditions between each particle, that is, when the contacts between particles disappear becouse of looseness of the particles induced by the vibrating load, the resistance will be increased. The relations among the electrical resistance among particles, vibrating conditions, particle sizes were investigated and the behavior of the particles during vibration was discussed.(2)Model experiments with an exciterModel experiments were carried out to study on the relationship among the compacting effects of the exciters and its vibrating conditions. In the experiments, a small-sized exciter vibrates on the model ground and the compacting force induced in the ground by the exciter was measured. The relationship between the compacting force and the vibrating conditions of the exciter was discussed.(3)Field experiments with vibratory rollersFiels experiments were carried out to confirm the results obtained through the model experiments.From the results of (1)-(3) studies, the mechanism of soil compaction under the vibrating load was discussed and then the existence of the optimum vibrating frequency for each ground condition was indicated. The method to determine the optimum vibrating conditions was studied with the base of those results of the studies.