地震荷载作用下地下厂房洞室群的动力响应分析
|
摘要
在地下厂房的长期使用期限内,其除了承受自身开挖引起的应力作用外,还将受到许多不可预知力的作用,地震就是其中之一。而地震动荷载下地下洞室的响应分析是一个复杂的问题。虽然地下工程的设计方法逐渐成熟,但目前仍以拟静力方法为主。本文以某水电站地下厂房洞室群为例,利用FLAC3D对其进行了动力分析,详细说明了计算步骤。计算结果表明,地震动作用增加了洞室临空面变形,且计算结果大于拟静力方法计算的结果,在进行工程设计时,应慎重选择。本文的计算成果可以为类似的工程计算提供参考。
Beside the excavation-caused stress forces,an underground workshop in its lifetime usually suffers from various unpredicted forces such as earthquake forces.Analysis on the dynamical responses of underground caverns to earthquakes is a complicated issue of engineering design and pseudo-static method remains dominant even through the current design method of underground engineering is quite mature.This work uses a case study of a hydropower station,simulates the dynamical responses of its underground cavern by FLAC3D,and explains the calculation steps in details.The results show that earthquake forces increase the displacements of cavern,i.e.larger values than the ones by pseudo-static method,which indicates that extreme caution should be taken in the design.
Beside the excavation-caused stress forces,an underground workshop in its lifetime usually suffers from various unpredicted forces such as earthquake forces.Analysis on the dynamical responses of underground caverns to earthquakes is a complicated issue of engineering design and pseudo-static method remains dominant even through the current design method of underground engineering is quite mature.This work uses a case study of a hydropower station,simulates the dynamical responses of its underground cavern by FLAC3D,and explains the calculation steps in details.The results show that earthquake forces increase the displacements of cavern,i.e.larger values than the ones by pseudo-static method,which indicates that extreme caution should be taken in the design.
引文
[1]李海波,马行东,李俊如,戴会超等.地震荷载作用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.LI Haibo,MA Xingdong,LI Junru,DAI Huichao,et al.Study on influence factors of rock cavern displacement under earthquake[J].Chinese Journal of Geotechnical Engineering,2006,28(3):358～362.(in Chinese)
[2]郑永来,杨林德.地下结构震害与抗震对策[J].工程抗震,1999,(4):23～28.ZHENG Yonglai,YANG Linde.Earthquake damage of underground structure and aseismatic method[J].Earthquake RssitantEngineering,1999,(4):23～28.(in Chinese)
[3]季倩倩,杨林德.地下铁道震害与震后修复措施[J].灾害学,2001,16(2):31～36.JI Qianqian,YANG Li-de.Seismic damage and restoration measures of subway[J].Journal of catastrophology.2001,16(2):31～36.(in Chinese)
[4]张玉娥,白宝鸿,张耀辉,王赞之.地铁区间隧道震害特点、震害分析方法及减震措施的探讨[J].振动与冲击,2003,22(1):63～71.ZHANG Yue,BAI Baohong,ZHANG Yaohui,WANG Zan-zhi.Discussion of earthquake damage characteristics,analytical method andshock absorption measure of subway tunnel[J].Journal of Vibration and Shock,2003,22(1):63～71.(in Chinese)
[5]Itasca Consulting Group Inc.FLAC3D(Version3.0)Users Manual[M].USA:Itasca Consulting Group Inc,2002.
[6]闫长斌,徐国元,李夕兵.爆破震动对采空区稳定性影响的FLAC3D分析[J].岩石力学与工程学报,2005,24(16):2894～2899.YAN Changbin,XU Guoyuan,LI Xibing.Stability analysis of m ined.Out areas influenced by blasting vibration with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(16):2894～2899.(in Chinese)
[7]刘春玲,祁生文,童立强,赵法锁.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730～2733.LIU Chunling,QI Shengwen,TONG Liqiang,ZHAO Fasuo.Stability analysis of slope under earthquake with FLAC3D[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(16):2730～2733.(in Chinese)
[2]郑永来,杨林德.地下结构震害与抗震对策[J].工程抗震,1999,(4):23～28.ZHENG Yonglai,YANG Linde.Earthquake damage of underground structure and aseismatic method[J].Earthquake RssitantEngineering,1999,(4):23～28.(in Chinese)
[3]季倩倩,杨林德.地下铁道震害与震后修复措施[J].灾害学,2001,16(2):31～36.JI Qianqian,YANG Li-de.Seismic damage and restoration measures of subway[J].Journal of catastrophology.2001,16(2):31～36.(in Chinese)
[4]张玉娥,白宝鸿,张耀辉,王赞之.地铁区间隧道震害特点、震害分析方法及减震措施的探讨[J].振动与冲击,2003,22(1):63～71.ZHANG Yue,BAI Baohong,ZHANG Yaohui,WANG Zan-zhi.Discussion of earthquake damage characteristics,analytical method andshock absorption measure of subway tunnel[J].Journal of Vibration and Shock,2003,22(1):63～71.(in Chinese)
[5]Itasca Consulting Group Inc.FLAC3D(Version3.0)Users Manual[M].USA:Itasca Consulting Group Inc,2002.
[6]闫长斌,徐国元,李夕兵.爆破震动对采空区稳定性影响的FLAC3D分析[J].岩石力学与工程学报,2005,24(16):2894～2899.YAN Changbin,XU Guoyuan,LI Xibing.Stability analysis of m ined.Out areas influenced by blasting vibration with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(16):2894～2899.(in Chinese)
[7]刘春玲,祁生文,童立强,赵法锁.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730～2733.LIU Chunling,QI Shengwen,TONG Liqiang,ZHAO Fasuo.Stability analysis of slope under earthquake with FLAC3D[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(16):2730～2733.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心