基岩中深埋大型容器抗震分析  

ASEISMIC ANALYSIS OF LARGE STEEL VESSEL BURIED IN THE DEEP UNDERGROUND ENGINEERING

作　　者：王新征[1] 邹广平[2] 陈剑杰[1] 王春明[1] 李萍[3] 

机构地区：[1]西北核技术研究所,陕西西安710024 [2]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001 [3]交通运输部公路科学研究院,北京100088

出　　处：《岩石力学与工程学报》2013年第S2期3493-3500,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国防预研基金项目(KY201002C);中央级公益性科研所基本科研业务费专项资金(ZQ43111201);中国博士后科学基金项目(20110490344)

摘　　要：深埋地下包含放射性废物的大型容器,在较长的服役期限内需要对放射性屏蔽结构进行结构抗震分析。在分析地下结构抗震研究现状的基础上,提出采用试验与数值模拟相结合的手段作为深埋地下容器的抗震分析方法。分析基岩场地深地下地震动测量数据,总结地震动随深度变化规律,并拟合加速度、速度和位移幅值比随深度的变化曲线。基于场地活断层调查、地震动参数随深度变化规律及最不利设计地震动思想,对1989年10月18日的Loma Prieta地震的基岩场地测量数据进行变换,得到研究场地地下300 m处的设计地震动时程。采用弹塑性Mohr-Coulomb本构模型描述膨润土和混凝土的力学性能,并利用Wille土三轴试验仪和岩石三轴仪测得相关参数。最后采用有限元软件ABAQUS分析屏蔽结构在地震作用下的响应特征,结果表明,在该地震作用下膨润土与混凝土屏蔽层之间产生缝隙;膨润土局部区域产生塑性变形;顶部混凝土屏蔽层塑性变形较小,屏蔽结构处于安全范围内。本研究是对深地下结构抗震分析的有益探索。For the large steel vessel storing high-level radioactive waste buried in the deep underground engineering,the aseismic analysis of shielding structure from radioactivity is necessary in the long service time. On the base of analyzing the status aseismic for underground engineering,the method of combining the experiments and numerical simulation was put forward to aseismic analysis of the deep buried large scale vessel steel. After studying the observed seismic data in the basement rock,the rules of ground motion varying with depth were summarized,and the fitting curves between the amplitude ratio(acceleration,velocity and displacement) and depth were obtained. Based on above rules and curves,the investigation of active fault and the thought of the most unfavorable design ground motions,the design seismic ground motion at 300 deep m in the design site was received. It is modified from the records on the basement rock by the Loma Prieta earthquake taking place on October 18,1989. The elastoplastic Mohr-Coulomb(M-C) constitutive equation was selected to describe the bentonite and concrete,and the parameters of M-C were experimented on the Wille soil triaxial and rock triaxial apparatus respectively. At last,the seismic response of the shielding structure was analyzed with the finite element software ABAQUS. The results show that there are cracks between bentonite and steel vessel;plastic strain occurs in local region of bentonite layer; and the plastic strain of concrete layer is very small,which lies in the safety limit. The method in the paper is helpful for seismic design of underground engineering.

关 键 词：地震工程 深地下工程 高放射性废物处置 地下地震动 抗震分析 深埋大型容器 

分 类 号：TU435[建筑科学—岩土工程]