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对大规模的城市建设行为,在当前振动源越来越多的情况下,总结了分析城市建设荷载的表现形式及其导致的场地土结构、性状的变化,得出场地土动力参数与剪切波速关系,测试研究场地土在不同密度、含水量、应力状态下剪切波速的变化情况,探讨了城市建设引发的场地土层动力特性变异规律,并与建筑场地打桩前后剪切波速变化的工程实例进行了对比分析。试验结果表明,地面建筑、地下工程、地下水开采等城市建设行为,造成了土体的密度、含水量以及应力变化,场地土剪切波速发生变更,引起场地土动力特性变异,整体或局部改变了建筑场地类别。建筑场地抗震设计应该适当考虑大规模城市建设引发的场地土动力特性变异对抗震参数取值的影响。
For the large-scale urban construction behavior, with the current vibration source more and more, the paper analyzes the manifestation of the urban construction load and the change of the soil structure and traits caused by the urban construction, and obtains the dynamic parameters of the soil and the shear The relationship between wave velocity and shear wave velocity of soil in different density, water content and stress state was tested and studied. The variation regularity of dynamic characteristics of soil layer caused by urban construction was discussed and compared with the project of shear wave velocity change before and after piling in construction site Examples were comparative analysis. The test results show that the urban construction behaviors such as ground construction, underground engineering and groundwater exploitation result in the change of density, water content and stress of the soil and the change of the shear wave velocity of the soil, causing the variation of the dynamic characteristics of the soil in the site and changing in whole or in part Construction site categories. Seismic design of building sites should give due consideration to the influence of the variation of the dynamic characteristics of the site on the seismic parameters due to the large-scale urban construction.