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地裂缝对工程结构的安全性影响巨大。在高烈度地区,若仍采用空间避让原则,势必浪费有限的土地资源,制约城市建设与经济发展。为了研究地裂缝场地的动力响应,使其得到更好的应用,以西安f4地裂缝为例,进行地裂缝场地地震动力响应振动台试验研究。试验结果分析表明:加速度放大系数与输入地震波类型和强度、土层性质和厚度及测点位置等因素有关;地裂缝场地加速度响应存在上、下盘效应,地表峰值加速度在裂缝处达到最大,并向两侧递减,下盘峰值加速度衰减速率比上盘快;裂缝两侧测点的加速度峰值存在时间差,上盘加速度变化频率较快。其研究成果将为地裂缝场地的工程应用提供参考。
Ground fissures have a huge impact on the safety of engineering structures. In areas with high intensity, if we still adopt the principle of space avoidance, we will inevitably waste limited land resources and restrict urban construction and economic development. In order to study the dynamic response of the ground fissure site and make it better applied, taking the f4 ground fissure in Xi’an as an example, the shaking table test on the dynamic response of the ground fissure site is carried out. The experimental results show that the acceleration amplification factor is related to the type and intensity of input seismic waves, the nature and thickness of soil layers and the location of measuring points. The acceleration response of ground fissures has the effects of both upper and lower plates, and the peak acceleration of the ground surface reaches the maximum at the fissures Decreasing on both sides, the lower peak acceleration decay rate faster than the plate; peak acceleration points on both sides of the crack there is a time difference, the disk acceleration changes faster. The research results will provide a reference for the engineering application of ground fissure sites.