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北京市区沿三里河—西四—德胜门有一条地震高烈度异常带,其产生异常的原因众说不一。目前北京地区仍存在中等强度地震的波及与威胁,同时该区高层建筑正在日新月异的发展,因而探明这条高烈度异常的成因看来是很必要的。本文回顾了有关场地工程地质条件对地震动的影响的研究进展,详细分析了该区的工程地质和基岩构造情况,利用经作者扩展的SAP 5程序计算了典型剖面的地震反应。结果表明深度在1000—1500米的基岩凹陷对这一高烈度异常似有着控制性的影响。由于地面振动的卓越周期在1.0秒左右,将对该区的长周期结构(如高层建筑和烟囱等)带来不利影响。
Beijing Sanlihe-Xidi-Deshengmen area has an earthquake with high seismic intensity anomalies, the reasons for the abnormalities say different. At present, there is still the threat and intensity of moderate-intensity earthquakes in Beijing. At the same time, the high-rise buildings in this area are developing rapidly with each passing day. Therefore, it is necessary to find out the cause of this high intensity anomaly. This paper reviews the research progress on the impact of site geological conditions on ground motion, analyzes the engineering geology and bedrock structure in detail, and calculates the seismic response of a typical section by using the extended SAP 5 program. The results show that the depth of 1000-1500 m bedrock depression on this high intensity anomalies may have a controlling impact. Since the excellent period of ground vibration is around 1.0 second, it will adversely affect the long-period structure of the area such as high-rise buildings and chimneys.