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通过土工离心机振动台试验研究了软粘土地基上建筑物不均匀震陷问题,考察了结构物不对称性对不均匀震陷的影响.试验采用超固结高岭土地基和三维不对称结构物模型,以及整体对称的随机地震波输入,并利用弯曲元监测施振前后软土地基剪切波速以表征软土结构的演化.试验表明,软土地基不均匀震陷由地震瞬时沉降和震后长期固结沉降组成,基础不均匀沉降主要发生在地震瞬时,震后长期沉降虽然显著但相对均匀.结构物对称性对软土地基震陷影响显著,与一维或二维结构相比,三维不对称结构引起了显著的不均匀震陷,该震陷量占地震引起总沉降的一半左右,导致基础呈现出复杂的空间扭转破坏特征.
Through the test of shaking table of geocentrifuge, the problem of uneven seismic subsidence of buildings on soft clay foundation was investigated, and the effect of structural asymmetry on the inhomogeneous seismic collapse was investigated. The overconsolidated kaolinite foundation and three-dimensional asymmetric structure model , As well as the input of stochastic seismic wave with overall symmetry, and using the curved element to monitor the shear wave velocity of soft soil foundation before and after the application of stochastic vibration to characterize the evolution of soft soil structure.The experiment shows that the non-uniform seismic settlement of soft ground is caused by the instantaneous subsidence of the earthquake and the long- The settlement of the junction and the basic uneven settlement mainly occur at the moment of the earthquake, although the long-term settlement after the earthquake is significant but relatively uniform.The symmetry of the structure has a significant influence on the seismic subsidence of the soft soil foundation. Compared with the one-dimensional or two-dimensional structure, the three-dimensional asymmetry The structure causes significant inhomogeneous seismic subsidence, accounting for about half of the total settlement caused by the earthquake, resulting in a complex space torsion failure characteristic of the foundation.