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根据埃及Gasco天然气公司工程场地的现场调查资料、地震活动性和地震灾害评估结果,对该场地进行了评估。通过浅源地震波折射勘探,对8个地震剖面上的土壤和岩石的弹性动态常数进行了分析。场地地面模型包括两层,分析表明它们具有从中值到高值的弹性动态常数,说明场地有良好的土壤条件和基岩岩性。同时,我们搜集和分析了研究区周围150 km半径范围内的历史和仪器记录地震,从构造环境、地震活动性、地质构造和主要地震的断层面解等方面进行了研究,认为场地受4个震源区的影响:苏伊士中部海湾、开罗—苏伊士地区、开罗西南和Beni-Suef地区。我们采用地震活动性统计方法并结合专家判定,确定了这些震源区内最大地震的矩震级(MW)。另外,依据场地峰值加速度(PGA)和反应谱,用随机方法对场地进行了地震灾害评估。4个震源区中, Beni-Suef地区距离工程场地最近,其PGA最大值为9.34 cm/s2,但这个值很小,表明地震不会对工程场地产生破坏性影响。最后,我们还模拟了阻尼为1%、3%和5%时的伪加速度场地反应谱。
The site was evaluated on the basis of on-site investigation data, seismic activity and seismic disaster assessment of the Gasco Gas project site in Egypt. The elastic dynamic constants of soils and rocks on eight seismic sections are analyzed by shallow seismic reflection. The site ground model consists of two layers and analysis shows that they have elastic dynamic constants from medium to high values, indicating that the site has good soil conditions and bedrock lithology. At the same time, we collected and analyzed historical and instrumental records of earthquakes within a radius of 150 km around the study area, and studied the tectonic environment, seismicity, geological structure and fault surface solutions of major earthquakes. We consider that the site is affected by 4 Impact of source regions: Central Gulf of Suez, Cairo-Suez Region, Southwest Cairo and Beni-Suef Region. We use seismicity statistics and expert judgment to determine the moment magnitude (MW) of the largest earthquake in these source regions. In addition, based on the peak acceleration (PGA) of the site and the response spectrum, a random earthquake disaster assessment of the site was conducted. Among the four focal zones, the Beni-Suef area is the closest to the project site with a maximum PGA of 9.34 cm / s2, but this value is small, indicating that the earthquake will not have a devastating impact on the site of the project. Finally, we simulated pseudo-acceleration field response spectra with damping of 1%, 3% and 5%.