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本文以平均剪切模量作为衡量场地土质影响的指标,对唐山地震玉田异常区进行了研究。文中认为形成该异常区的原因是地表20米土层具有较高的平均刚度和土层中含有较多的粗颗粒土。文中通过不同架度土层(10米、20米、30米)的平均剪切模量与震害的对比,讨论了土层厚度对震害的影响。文中又进行了场地地震动反应计算,对比了场地振动特性与震害的关系。最后,利用现场资料验证了以平均剪切模量法进行小区划的可靠性。
In this paper, the mean shear modulus is used as an index to measure the soil quality of the site, and the anomaly area of Yutian in Tangshan earthquake is studied. It is believed that the reason for the formation of the anomalous zone is that the 20 m surface layer has a high average rigidity and the soil contains more coarse-grained soil. In this paper, the effect of soil thickness on earthquake damage is discussed through the comparison of average shear modulus and earthquake damage of soil layers of different scales (10m, 20m, 30m). In this paper, the ground motion response calculation is carried out, and the relationship between the vibration characteristics and the earthquake damage is compared. Finally, the reliability of zoning based on the average shear modulus method is verified by field data.