基于FLAC3D江坪河水电站泄洪洞衬砌地震响应分析
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摘要
根据江坪河水电站工程资料,采用FLAC3D软件非线性分析方法对泄洪洞混凝土衬砌结构在地震作用下的响应进行动力计算;对衬砌上出现水平峰值位移和峰值应力最大的关键点进行跟踪,对某时刻衬砌上出现的最大水平位移与最大第一、三主应力进行分析。结果表明在地震波作用下,断层对衬砌结构应力影响明显,衬砌结构的应力最大响应时刻为4.4s;衬砌与断层相交处是衬砌结构的薄弱部位,应做加固处理。
According to the engineering data of Jiangpinghe Hydropower Station,nonlinear analytic method in FLAC3D software is adopted to calculate the seismic response of concrete lining structure of spillway tunnels,and the key points of horizontal peak displacement and peak stress on the lining are trailed.The maximum horizontal displacement and the largest first and third principal stress on the lining are analyzed.The results show that fault affect stress of lining structure under the earthquake wave and the response of stress of lining structure appears in 4.4s;the intersections of the lining and the fault are weak parts,they should be reinforced.
According to the engineering data of Jiangpinghe Hydropower Station,nonlinear analytic method in FLAC3D software is adopted to calculate the seismic response of concrete lining structure of spillway tunnels,and the key points of horizontal peak displacement and peak stress on the lining are trailed.The maximum horizontal displacement and the largest first and third principal stress on the lining are analyzed.The results show that fault affect stress of lining structure under the earthquake wave and the response of stress of lining structure appears in 4.4s;the intersections of the lining and the fault are weak parts,they should be reinforced.
引文
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[2]国胜兵,赵毅,赵跃堂,等.地下结构在竖向和水平地震荷载作用下的动力分析[J].地下空间,2002,22(4):314-319.
[3]刘宁.地震荷载作用下地下厂房洞室群的动力响应分析[J].水力发电学报,2011,30(6):25-29.
[4]胡海鑫,姜袁,雷敏.江坪河洞室群出口段围岩稳定性分析研究[J].中国农村水利水电,2010,(10):69-72.
[5]杨阳,肖明.地下洞室动力计算模型合理截取范围研究[J].中国农村水利水电,2011,(1):111-114.
[6]SL203-2000,水工建筑物抗震设计规范[S].
[7]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[8]李围.隧道及地下工程FLAC解析方法[M].北京:中国水利水电出版社,2009.
[9]杨文峰,张明聚,吕琦,等.基于FLAC3D的土钉支护结构地震稳定性分析[J].三峡大学学报(自然科学版),2009,(5):46-48.
[10]Itasca Consulting Group.Theory and Background[R].Minneso-ta:Itasca Consulting Group,2002.
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