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强振动荷载作用下海底沉积物可能会发生液化。为了解粉土振动液化和再固结过程中波速特性与物理性质的变化规律,采用振动台试验模拟地震作用,针对不同状态的土体开展了波速测量和土体物理性质测试,研究了纵、横波速度的变化规律以及与物理性质之间的相关性。试验结果表明:与原始固结状态相比,粉土液化后纵、横波速度降低;液化再固结后土体纵、横波速度明显升高。纵、横波速度与沉积物物理性质具有良好的相关关系,与密度、平均粒径呈正相关,而与孔隙度、含水量具负相关性。相对于纵波速度,横波速度对沉积物的物理性质更敏感,能更好地刻画沉积物物理性质的变化。
Sea bottom sediments may liquefy under strong vibration loading. In order to understand the regularity of wave velocity characteristics and physical properties during the process of liquefaction and re-consolidation, the shaking table test was used to simulate the earthquake action. The wave velocity and physical properties of soils under different conditions were tested. The variation of shear wave velocity and the correlation with the physical properties. The experimental results show that compared with the original consolidation state, the longitudinal and transverse shear velocities of the silt decrease after liquefaction, and the longitudinal and transverse shear velocities of the soil after liquefaction and re-consolidation are obviously increased. Longitudinal and transverse wave velocities have a good correlation with sediment physical properties, and are positively correlated with density and average grain size, but negatively correlated with porosity and water content. Compared with the P-wave velocity, the S-wave velocity is more sensitive to the physical properties of the sediment and better characterizes the changes in the physical properties of the sediments.