填石料的振动压实变形特性及压实机理试验研究

Experimental research on transforming characteristics and compaction mechanism of rockfill under the process of vibration compaction

在进行填石料常规土工试验的基础上,建立填石料振动压实的室内试验模型,采用平板振动器对填石料分层进行振动压实,利用水准仪观测填石料在振动压实中的沉降量,利用动土压力计观测填石层内的压力变化。试验结果表明:随着振动压实遍数的增加,填石层的沉降增加,密实度提高,但当沉降达到一定值以后,随着振动压实遍数的增加,填石层的沉降不增加反而减少,密实度降低。根据填石料在振动压实过程中的沉降变形特性及土压力的变化情况,结合应力波理论揭示填石料在振动压实中的压实机理。

Based on the routine test of rockfill, built indoor model experiment of it under the process of vibration compaction, the flat panel vibration machine was used to vibrate and compact the layered rockfill, the level instrument was used to observe the settlement of rockfill after vibration compaction, dynamical soil manometer was used to observe the pressure variety in the rockfill layer. The results show that, the settlement of rockfill increases with vibration compaction times adds, its density enhances, when the settlement of rockfill reaches some extent, it decreases instead increases with the vibration compaction increases, moreover the density reduces. According to the transform characteristic and soil pressure diversification of rockfill under the process of vibration compaction, the stress wave theory are combined to open out the compaction mechanism of rockfill under the process of vibration compaction.