影响核电厂取水隧洞抗震性能的几个因素分析
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摘要
为了分析影响取水隧洞抗震性能的主要因素,运用动力时程反应分析方法,利用FLAC3D程序对某核电厂取水隧洞进行了抗震分析,并绘制衬砌内力包络图,分析地应力、应力释放系数、围岩弹性模量等参数变化对隧洞衬砌内力的影响。结果表明,随着初始地应力的增大,衬砌内力逐步增大;开挖时应力释放系数越小,二衬分担应力释放荷载比例越大,衬砌的内力也就越大;随着围岩弹性模量的增大,衬砌内力大幅度降低。该成果对隧洞抗震设计具有一定的参考价值和指导意义。
In order to analyze the factors of intake tunnel in seismic behavior,aimming at the nuclear power plant structure and adopting time domain analysis approach,seismic analysis of nuclear power project for intake tunnel is made with FLAC3D in this paper.The authors also protract envelope diagram of lining.The influences of variety of initial geostress、stress release factor and elastic modulus of wall rock on the inter force of lining are researched in the paper.The result shows that,with the increase of initial geostress,internal forces of the lining increased gradually;The lower of stress release factor is,the greater of ratio of the release load is,the greater of the internal force of lining is;With the increase of elastic modulus of wall rock,the internal force reduces significantly.The regularity so obtained can provide the basis of the tunnel earthquake-proof analysis.
In order to analyze the factors of intake tunnel in seismic behavior,aimming at the nuclear power plant structure and adopting time domain analysis approach,seismic analysis of nuclear power project for intake tunnel is made with FLAC3D in this paper.The authors also protract envelope diagram of lining.The influences of variety of initial geostress、stress release factor and elastic modulus of wall rock on the inter force of lining are researched in the paper.The result shows that,with the increase of initial geostress,internal forces of the lining increased gradually;The lower of stress release factor is,the greater of ratio of the release load is,the greater of the internal force of lining is;With the increase of elastic modulus of wall rock,the internal force reduces significantly.The regularity so obtained can provide the basis of the tunnel earthquake-proof analysis.
引文
[1]核电厂抗震设计规范[M].北京:国家地震局,1997.
[2]张鸿,毕继红,张伟.地铁隧道地震反应非线性分析[J].地震工程与工程振动,2004,24(6):146-153.
[3]李海波,马行东,李俊如,等.地震荷载作用下地下岩体洞室位移特征的影响因素分析[J].岩土工程学报,2006,28(3):358-362.
[4]陈健云,胡志强,林皋.超大型地下洞室群的随机地震响应分析[J].水利学报,2002(1):71-75.
[5]马行东,李海波,冯海鹏.动参数对三维洞室动态特性的影响分析[J].地下空间与工程学报,2006,2(1):83-86.
[6]Itasca Consulting Group Inc.FLAC-3D(Fast Lagrangian Analysis of Continua in 3 Dimensions),Version 3.00,Users Manual[R].USA:ItascaConsulting Group Inc,2006.
[2]张鸿,毕继红,张伟.地铁隧道地震反应非线性分析[J].地震工程与工程振动,2004,24(6):146-153.
[3]李海波,马行东,李俊如,等.地震荷载作用下地下岩体洞室位移特征的影响因素分析[J].岩土工程学报,2006,28(3):358-362.
[4]陈健云,胡志强,林皋.超大型地下洞室群的随机地震响应分析[J].水利学报,2002(1):71-75.
[5]马行东,李海波,冯海鹏.动参数对三维洞室动态特性的影响分析[J].地下空间与工程学报,2006,2(1):83-86.
[6]Itasca Consulting Group Inc.FLAC-3D(Fast Lagrangian Analysis of Continua in 3 Dimensions),Version 3.00,Users Manual[R].USA:ItascaConsulting Group Inc,2006.