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大型振动台模型试验和计算分析结果表明,土层液化对地面运动的影响主要表现为:液化段地面运动时程在形状、幅值和频谱等方面均有很大变化;而且,当孔压比达到0.6—0.7时土层液化就开始对地面运动产生影响。此外,波的短周期成份降低甚至被滤掉,长周期成份被放大,但是这种被滤掉或放大的周期段将随各种因素而变。输入地震波特征对液化时刻或液化开始起作用的时刻有重大影响,所得结果可用以很好解释液化宏观震害现象。
The results of large-scale shaking table model tests and calculations show that the effect of soil liquefaction on ground motion is mainly manifested in that the ground motion time in the liquefaction section varies greatly in terms of shape, amplitude, and frequency spectrum, and when the pore pressure ratio When it reaches 0.6-0.7, the liquefaction of the soil begins to affect the ground motion. In addition, the short-period component of the wave is reduced or even filtered out, and the long-period component is amplified, but the period of the filtered or amplified period will vary depending on various factors. The characteristics of input seismic waves have a significant influence on the moment of liquefaction or the moment when liquefaction begins to function. The results obtained can be used to explain the phenomenon of liquefaction macroscopic damage.