大型岩体洞室采用柔性垫层减震的可行性研究
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摘要
采用无限元作为岩体地下洞室静动力分析的边界条件,建立了岩体地下洞室的静动力有限元-无限元(FE-IE)计算模型,分析了柔性垫层对水电站厂房这类大型岩体洞室结构的减震效果。研究结果表明:柔性垫层虽未能从根本上改变岩体洞室结构的地震响应,但是设置一定厚度的柔性垫层后不仅能充分发挥岩体洞室围岩的自承能力,而且还能明显地减小混凝土衬砌的地震反应;用于水电站厂房这类大型岩体洞室减震的柔性垫层应该具有一定的厚度和弹性模量;在工程许可的情况下,应尽量选取密度较低的材料作为柔性垫层,可根据岩体洞室实际服务期限内所能经历的最大应力环境来确定柔性垫层的强度。研究成果对类似的地下工程的减震设计有一定的借鉴意义。
An FE-IE model is set up for the stability analysis of large underground rock cavern by using infinite elements as the static and dynamic boundaries.On the basis of this proposed static and dynamic FE-IE model,the research on the seismic resistance of soft-seismic absorption layer for large rock cavern is performed.The simulated results show that although the seismic absorption layer couldn't essentially change the dynamic response of rock cavern,it not only can fully utilize the self-supporting ability of surrounding rocks,but also can dramatically decrease the seismic response of concrete liner.The results also indicate that as for this kind of large underground rock cavern in a hydraulic power plant,the soft-seismic absorption layer should possess a certain degree of thickness and elastic modulus.The density of the absorption layer should be as small as possible.And it's better to choose a reasonable strength for the seismic absorption layer according to the total stress that it could experience during its service life.The conclusions of this work could be used as a primary guidance on the seismic design for the similar underground engineering.
An FE-IE model is set up for the stability analysis of large underground rock cavern by using infinite elements as the static and dynamic boundaries.On the basis of this proposed static and dynamic FE-IE model,the research on the seismic resistance of soft-seismic absorption layer for large rock cavern is performed.The simulated results show that although the seismic absorption layer couldn't essentially change the dynamic response of rock cavern,it not only can fully utilize the self-supporting ability of surrounding rocks,but also can dramatically decrease the seismic response of concrete liner.The results also indicate that as for this kind of large underground rock cavern in a hydraulic power plant,the soft-seismic absorption layer should possess a certain degree of thickness and elastic modulus.The density of the absorption layer should be as small as possible.And it's better to choose a reasonable strength for the seismic absorption layer according to the total stress that it could experience during its service life.The conclusions of this work could be used as a primary guidance on the seismic design for the similar underground engineering.
引文
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[2]孙铁成,高波,叶朝良.地下结构抗震减震措施与研究方法探讨[J].现代隧道技术,2007,44(3):1-5,10.
[3]章伟.近年日本的隧道施工与抗震设计[J].世界地震工程,2006,22(2):68-71.
[4]黄胜,陈卫忠,杨建平,等.地下工程地震动力响应及抗震研究[J].岩石力学与工程学报,2009,28(3):483-490.
[5]Kiyomiya O.Earthquake-resistant design features of immersed tunnels in Japan[J].Tunnelling and Underground Space Technology,1995,10(4):463-475.
[6]周德培.强震区隧道洞口段的动力特性研究[J].地震工程与工程振动,1998,18(1):124-130.
[7]陈健云,胡志强,林皋.超大型地下洞室群的三维地震响应分析[J].岩土工程学报,2001,23(4):494-498.
[8]杨自友,顾金才,陈安敏,等.爆炸波作用下锚杆间距对围岩加固效果影响的模型试验研究[J].岩石力学与工程学报,2008,27(4):757-764.
[9]Peck R B,Hendron A J,Mohraz B.State of the art of soft ground tunnelling[C]∥Proceedings of the Rapid Excavation and Tunnelling Confer-ence,Chicago,IL.,1972.
[10]ABAQUS Inc.ABAQUS/Standard Version 6.6.ABAQUS Theory Manual.ABAQUS Inc.,Providence RI,2006.
[11]杜修力,廖维张,田志敏,等.炸药爆炸作用下地下结构的动力响应分析[J].爆炸与冲击,2006,26(5):474-480.
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