尾矿库工程场地的地震安全性评价

Seismic Safety Evaluation on Engineering Site of the Tailings Pond

针对某大型尾矿库加高扩容项目,开展工程场地的地震安全性评价。内容包括:对区域的地震构造、断裂活动性进行评价;确定震级上限、地震带起算震级、地震带b值和v4,确定潜在震源区的主破裂方向与分布函数;确定潜在震源区对场地基岩地震加速度峰值的贡献概率,给出50 a和100 a的不同超越概率基岩地震动加速度峰值和反应谱;经拟合基岩谱,获得场地设计地震动参数,并合成设计地表地震动时程曲线。研究成果可为大型尾矿库抗震设计提供理论依据和参考。

Aiming at a project of heightening and expanding large tailings pond,seismic safety evaluation on the engineering site was conducted. The research includes evaluation on seismic structure and fracture activity of a region;determination of magnitude limit,earthquake magnitude,seismic zone b and v4;establishment of the main fracture direction and spatial distribution function for the potential seismic source area;determination of the contribution probability of the potential seismic source area to the peak earthquake acceleration of bedrock in site;and description of the peak and reaction spectra of the bedrock seismic acceleration with different surpasses probability in the 50 years and 100 years. By fitting bedrock spectrum,the seismic parameters in designing the engineering site were obtained,and the ground seismic time-history curves were composited. The research results can provide theoretical basis and reference for design of seismic resistance for large tailings pond.