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砂土颗粒之间接触的法向分布和颗粒形状所引起的内在各向异性会对地基的地震响应有明显的影响。为了深入认识砂土内在各向异性对地层动力响应的影响,制作了专门的离心机模型箱以控制砂土的不同沉积方向模拟砂土的内在各向异性,并且通过一系列离心机振动模型试验再现了砂土内在各向异性对砂土动力学特性的影响,包括对地层加速度、位移和超孔隙水压力的影响。研究发现,尤其在饱和情况下,砂土的内在各向异性对砂土的动力学特性影响非常大,沉积方向为90度的砂样模型抗液化能力明显较差,导致较大的沉降。为了更加准确的预测结构物在地震区的动力特性,建议在工程设计中应考虑砂土内在各向异性的影响。
The normal distribution of the contact between the sand particles and the intrinsic anisotropy caused by the particle shape will have a significant effect on the seismic response of the foundation. In order to understand the influence of intrinsic anisotropy of sand on the formation dynamic response, a special centrifuge model box was designed to control the inherent anisotropy of sand simulated in different depositional directions of sand and sand. Through a series of centrifuge vibration model tests The effect of sand intrinsic anisotropy on the dynamic characteristics of sand, including the effect on formation acceleration, displacement and excess pore pressure, is reproduced. It is found that the intrinsic anisotropy of sand has a great influence on the dynamic characteristics of sand, especially under saturated conditions. The sand-liquefaction model with 90-degree sedimentary direction is significantly less resistant to liquefaction, leading to larger settlement. In order to more accurately predict the dynamic characteristics of the structure in the earthquake zone, it is suggested that the influence of the inherent anisotropy of sand should be considered in engineering design.