软弱土层中自由场地震响应离心模型试验中，采用层状剪切箱，研究了软弱土层中不同强度地震荷载作用下场地的响应。研究结果表明：地基土的地震响应与地震强度条件密切相关，地表地震加速度放大系数随着基岩入射地震强度的增大而减小，并且对土体的侧向位移和地表沉降等存在显著影响。

Centrifugal modeling technique was employed to study the dynamic earthquake response of free-field in soft soil. Three sets of earthquake input motions with different intensities were applied in the tests. Meanwhile, a laminar box was used to consider the flexible boundary during earthquakes. The earthquake responses of foundation soil were observed and presented. The results indicated that the performance of ground (lateral displacement and settlement) depended on the intensities of the excitation motions distinctively. A stronger earthquake leads to larger exact acceleration value. However, the acceleration amplification effect is reduced especially at the ground surface.