地下储油岩库稳定性的三维流固耦合分析
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摘要
地下储油岩库具有洞室规模大,空间结构复杂,地下水渗流作用等特点,针对流固耦合对储油岩库整体稳定性的影响、复杂交叉结构的空间受力变形特征及掌子面推进的空间影响范围等问题,应用FLAC3D大型工程软件对地下储油岩库稳定性进行三维流固耦合分析。研究结果表明:地下水渗流与应力的耦合效应使洞库围岩强度弱化,塑性区及洞周围岩变形均明显增大,串联洞与主洞室的交接部位是设计与施工的关注点,尤其是主洞室拱部与其他结构的交接部位;交叉结构的存在使掌子面推进的空间影响范围扩大到两个主洞室间距的2倍左右,洞室围岩的受力变形规律对小的开挖步长不十分敏感。
Underground petroleum storage caverns are characterized by large bulk,complex structure and ground water permeation fluid action.Due to those facts,3D fluid-mechanical coupling stability analysis of underground petroleum storage caverns was carried out by using FLAC3Dprocedure.The influences of ground water seepage on the stability of surrounding rock mass,the distribution features of internal force and deformation behavior of intersections,and the zone influenced by advancing working face were studied.The results indicate that considering the coupling effect of ground water seepage and stress,the strength of surrounding rock mass is reduced,plastic zone and deformation of surrounding rock increase obviously.During the phase of design and construction,the connecting caverns cross the main caverns should be paid more attention,especially the intersections at the arch of main caverns.Due to the existence of structural intersections,the domain influenced by excavation expands to the double of the space between the two main caverns.And the mechanical behaviors of surrounding rock are not very sensitive to small excavation steps.
Underground petroleum storage caverns are characterized by large bulk,complex structure and ground water permeation fluid action.Due to those facts,3D fluid-mechanical coupling stability analysis of underground petroleum storage caverns was carried out by using FLAC3Dprocedure.The influences of ground water seepage on the stability of surrounding rock mass,the distribution features of internal force and deformation behavior of intersections,and the zone influenced by advancing working face were studied.The results indicate that considering the coupling effect of ground water seepage and stress,the strength of surrounding rock mass is reduced,plastic zone and deformation of surrounding rock increase obviously.During the phase of design and construction,the connecting caverns cross the main caverns should be paid more attention,especially the intersections at the arch of main caverns.Due to the existence of structural intersections,the domain influenced by excavation expands to the double of the space between the two main caverns.And the mechanical behaviors of surrounding rock are not very sensitive to small excavation steps.
引文
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[3]LEE Y N,SUH Y H,KIM D Y,et al.Stress and de-formation behaviour of oil storage caverns during excava-tion[J].International Journal of Rock Mechanics andMining Sciences,1997,34(3):1-15.
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[5]李云鹏,王芝银,韩常领,等.考虑地震影响的小间距隧道围岩流变损伤有限元分析[J].长安大学学报:自然科学版,2006,26(2):51-56.LI Yun-peng,WANG Zhi-yin,HAN Chang-ling,et al.Rheologic damage and earthquake influence on surround-ing rock of small spacing tunnels[J].Journal of Changan University(Natural Science Edition),2006,26(2):51-56.
[6]李云鹏,王芝银,韩常领,等.不同围岩类别小间距隧道施工过程模拟研究[J].岩土力学,2006,27(1):11-16.LI Yun-peng,WANG Zhi-yin,HAN Chang-ling,et al.Simulating study on construction process of tunnels withsmall spacing for different classes of surrounding rocks[J].Rock and Soil Mechanics,2006,27(1):11-16.
[7]李廷春,李术才,陈卫忠,等.厦门海底隧道的流固耦合分析[J].岩土工程学报,2004,26(3):397-401.LI Ting-chun,LI Shu-cai,CHEN Wei-zhong,et al.Coupled fluid-mechanical analysis of Xiamen subsea tun-nel[J].Chinese Journal of Geotechnical Engineering,2004,26(3):397-401.
[8]ODA M.An equivalent continuum model for coupledstress and fluid flowanalysis in jointed rock masses[J].Water Resources Research,1986,22(13):1845-1856.
[9]仵彦卿.岩体水力学基础[J].水文地质工程地质,1996(6):10-14.WU Yan-qing.Rock mass hydraulics fundamentals[J].Hydrogeology and Engineering Geology,1996(6):10-14.
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