EXPLICATION OF THE MECHANIZM OF SOIL COMPACTION AND ITS APPLICATION TOCONSTRUCTION

通过对振动压实机理的探讨，提出了一种有效的压实方法。（1）振动荷载作用下土颗粒运动特性的试验研究本文对振动荷载作用下土颗粒的堆积现象进行了试验研究。在实验中，煤颗粒受到振动载荷，并在振动过程中测量其电导率。煤颗粒的电阻取决于颗粒之间的接触情况，即当颗粒之间的接触由于振动载荷引起的颗粒松散而消失时，电阻将增大。研究了颗粒间电阻与振动条件、颗粒尺寸的关系，讨论了颗粒在振动过程中的行为。（2）激振器模型试验研究了激振器的压实效果与激振器振动条件的关系。在试验中，采用小型激振器在模型地基上进行振动，并测量了激振器在地基中产生的压实力。讨论了激振器振动条件与压实力的关系。（3）现场振动压路机试验通过现场振动压路机试验验证了模型试验的结果，并根据试验结果讨论了振动荷载作用下土壤的压实机理，指出了每种地基条件下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.