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介绍美国最新一代动循环单剪系统的组成及其特点,分析原始真实地震荷载的输入方法,并对真实地震荷载的输入有效性进行验证。以美国Filter净砂为对象,选择冲击型与振动型地震波作为试验输入荷载,考虑砂土相对密度、上覆荷载,设计不同试验工况研究地震荷载特征及其对砂土震陷的影响,共计试验组数202组。试验结果表明:在同一砂土相对密度和上覆荷载条件下,振幅相同的振动型地震波引起的砂土震陷比冲击型地震波引起的砂土震陷大;砂土震陷主要由最大地震荷载峰值之前的各个较大峰值的地震波引起,其中最大峰值对应的地震波引起的砂土竖向应变最大;对于最大峰值之后的地震波,其峰值应达到该地震波最大峰值的80%左右才对砂土变形具有较明显的贡献作用;冲击型地震波最大峰值之后的各地震波对砂土变形影响不明显;对于振动型地震波,其最大峰值之前及最大峰值之后一定范围内的地震波作用共同决定着砂土变形的大小。
This paper introduces the composition and characteristics of the latest generation single-shear system in the United States, analyzes the input method of the original true earthquake load, and verifies the input validity of the real earthquake load. Based on the U.S. Filter clear sand, impact and vibration-type seismic waves are selected as the test input loads. Considering the relative density of sand and overburden, the seismic load characteristics and their effects on sand-subsidence are studied under different experimental conditions. Test group number 202 groups. The results show that under the same sand relative density and overburden condition, the sand-shaking caused by the shock wave with the same amplitude causes the sand-fall larger than that caused by the shock wave. The sand-subsidence is mainly caused by the maximum seismic load Which is caused by the seismic waves of each large peak before the peak, of which the vertical strain caused by the seismic wave corresponding to the maximum peak is the largest. For the seismic wave after the maximum peak, the peak value should reach about 80% of the maximum peak value of the seismic wave Which has a significant contribution. The seismic waves after the maximum peak of the impact seismic wave have no obvious effect on the deformation of the sand soil. For the seismic waves of the vibration type, the seismic waves within a certain range before and after the maximum peak value jointly determine the deformation of the soil size.