EXPLICATION OF THE MECHANIZM OF SOIL COMPACTION AND ITS APPLICATION TOCONSTRUCTION

通过对振动压实过程中土壤致密化机理的探讨，提出了一种有效的土壤压实方法。(1)振动荷载作用下土壤颗粒行为的试验研究。在实验中，对煤粒施加振动载荷，并测量其在振动过程中的电导率。煤颗粒的电阻取决于颗粒间的接触条件，即当颗粒间的接触因振动载荷引起的颗粒疏松而消失时，颗粒间的接触会增大。研究了颗粒间的电阻、振动条件、颗粒大小之间的关系，讨论了颗粒在振动过程中的行为。(2)进行了激振器模型试验，研究了激振器压实效果与激振器振动条件之间的关系。在实验中，一个小型激振器在模型地面上振动，并测量了激振器在地面上产生的压实力。(3)振动压路机现场试验对模型试验结果进行了验证，根据(1)-(3)的研究结果，探讨了振动荷载作用下土的压实机理，指出了各种地基条件下最佳振动频率的存在。在此基础上，对确定最佳振动条件的方法进行了研究。

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.