Seismic Geophysical Exploration in Pingtan Strait Bridge, Fujian, East China Sea
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摘要: 全长3478m的平潭海峡大桥是一大型桥梁工程, 桥位自然条件恶劣, 工程地质条件复杂.为了克服浅层水域常见的电火花震源激发频率高、能量衰减快、探测深度浅等不足, 采用工程地震仪和振动冲击震源在海上开展地震反射波勘探工作, 结合地质钻探工作, 查明了桥址区的地层岩性分布、地质构造等工程地质问题, 为桥梁建设提供了重要的地质依据.工程应用表明: 在地球物理条件不利的情况下, 获得了较清晰的地震反射波, 其有效波主频为200Hz左右, 是水域工程地震勘探经济环保、简单有效的工作方法之一.Abstract: Building the Pingtan Strait bridge in Fujian Province, with a span of 3 478 m, is a very large project. Due to the bad natural conditions and insufficient investment capital, the engineering problems are very complex. According to the vibrating impact-model source, reflection seismic exploration was conducted to investigate the strata configuration and the geological conditions. At the same time, the evaluation was made of the geological engineering conditions for building the bridge.
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图 1 福建沿海中生代变质带地质简图
1.平潭-东山变质带; 2.福清-云霄变质带; 3.花岗岩类; 4.断裂带; 5.省界
Fig. 1. Sketch geological map of Mesozoic metamorphic belts of eastern Fujian
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