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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Dynamic geotechnical properties evaluation of a candidate nuclear power plant site (NPP): P- and S-waves seismic refraction technique, North Western Coast, Egypt
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Dynamic geotechnical properties evaluation of a candidate nuclear power plant site (NPP): P- and S-waves seismic refraction technique, North Western Coast, Egypt

机译：候选核电厂厂址（NPP）的动态岩土特性评估：埃及西北海岸的P波和S波地震折射技术

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摘要

Determination of the dynamic geotechnical properties and V(s)30 of soil and rocks from seismic wave velocities serves as essential inputs for a foundation design cognizant of seismic site response and rock strength. This study evaluates a site which was suggested for a Nuclear Power Plant (NPP) in El-Dabaa area, north western coast of Egypt. On the near subsurface geology is made up of a thick succession of limestone overlain by a thin layer of soft soil. Assessment of geotechnical materials and V(s)30 of the near sub-surface lithological layers are required for design of the foundation of critical structures like turbo-generator and reactor buildings. Interpretation of ninety one shallow P-waves and S-waves seismic refraction profiles distributed within the study area in conjunction with data of 76 boreholes were undertaken to delineate the dynamic properties of shallow soil for construction NPP. The velocity of the P- and S-waves were acquired and interpreted using SeisImager Software Package, then the results were used to build a velocity-depth model to estimate the depth to the bedrock and the thicknesses of overburden layers. This model was verified using boreholes data dissected the seismic profiles to improve the final velocity depth model. The depth to bedrock was determined from both shallow seismic refraction profiles and boreholes. V(s)30, elastic moduli and dynamic geotechnical parameters were calculated and the site was classified as a National Earthquake Hazard Reduction Program (NEHRP) class "B". The values of seismic velocities, the engineering consolidations, and the strength parameters showed that the bedrock in the study area is characterized by more competent rock quality.
机译：根据地震波速度确定动态岩土特性和土壤和岩石的V（s）30，是识别地震现场响应和岩石强度的基础设计的重要输入。这项研究评估了一个建议在埃及西北海岸的El-Dabaa地区建造核电站的地点。在近地下，地质是由一层厚厚的石灰岩和一层薄薄的软土所覆盖。土工材料和近地下岩性层的V（s）30的评估对于关键结构（如涡轮发电机和反应堆建筑物）的基础设计是必需的。结合76个钻孔的数据，对研究区内分布的91个浅P波和S波地震折射剖面进行了解释，以勾勒出施工NPP的浅层土的动力特性。使用SeisImager软件包获取并解释了P波和S波的速度，然后将结果用于建立速度深度模型，以估算基岩的深度和覆盖层的厚度。该模型已使用解剖地震剖面的井眼数据进行了验证，以改善最终速度深度模型。基岩的深度是根据浅层地震折射剖面和井眼确定的。计算了V（s）30，弹性模量和动态岩土参数，并将该地点归类为“美国国家地震减灾计划”（NEHRP）类别“ B”。地震速度，工程固结和强度参数的值表明，研究区的基岩具有更胜任的岩质特征。

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