工程场地地震安全性评价研究

发布时间：2018-05-13 07:35

  本文选题：历史震害 + 地震　； 参考：《西安建筑科技大学》2017年硕士论文

【摘要】：我国历史上是个震害多发国家,地震发生频繁波及范围广。近年来随着国民经济的迅速发展,地震灾害带来的经济损失逐年增大。因此在重大项目建设前期针对其场地的地震安全评估显得尤为重要,以地震安全评价结果为依据,确定抗震设防标准。本文通过对我国历史震害资料的归纳总结,得出重大工程中地震地质灾害评估的重要性。并以某大型化工企业设备装置扩容改造项目为背景,结合现有的地震安全评估理论对工程所在地的场地的区域地震活动、地震概率危险性、土层反应和地震动参数等进行评价研究。(1)通过对工程场地区域大量地震资料的归纳分析得出评估区100年内发生7级以上地震的概率在0.33-0.65之间,对工程场地有较大影响的是汾渭地震带中的渭河地震亚带。地震活动性研究表明,评估区近场区地震活动的空间和时间分布离散性较大。(2)通过对评估区域地质情况的勘察研究得出层土的剪切波速介于150-540m/s之间,各层土密度介于1.8-2.4kg/m3之间,评估场地工程地震条件较好,整体稳定性较好。(3)通过概率危险性分析得出工程场地50年不同超越概率情况下等效震源距和等效震级,其中最小的等效震源距为78.62km,最大等效震级为7.30。(4)通过对地震动设计参数确定方法的研究,确定了工程场地设计地震动参数,并对工程所在地地质灾害进行了评价。
[Abstract]:China is a country with frequent earthquake damage in history. With the rapid development of national economy in recent years, the economic losses caused by earthquake disasters are increasing year by year. Therefore, it is very important to evaluate the seismic safety of the site in the early stage of the major project construction. Based on the results of the seismic safety evaluation, the standard of seismic fortification is determined. Based on the summary of historical earthquake disaster data in China, the importance of seismic geological hazard assessment in major engineering is obtained in this paper. Based on the project of equipment expansion and reconstruction in a large chemical enterprise, combined with the existing theory of seismic safety assessment, the regional seismic activity and seismic probability risk of the site of the project are studied. Based on the analysis of a large number of seismic data in the engineering site area, it is concluded that the probability of occurrence of earthquakes with M 鈮，

本文编号：1882260