大连地下石油储备库洞室群围岩稳定性及渗流场分析
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摘要
为分析水封式大连地下石油储备库洞室群围岩稳定性及渗流场特征,首先基于现场地应力实测结果的回归分析,利用Fish语言编写函数,反演初始地应力场。其次,采用三维离散元程序3DEC生成三维节理网络模型,反演库区初始渗流场的各向异性特征。最后,利用应力与渗流耦合模块实施开挖仿真计算,获取围岩应力场、位移场变化特征。考虑平行、垂直层理面不同材料特性,基于带有抗拉的Mohr-Coulomb强度储备型点安全系数,定量评价洞室群的稳定性。借鉴国外水封效果评价标准,分别从地下水位线和垂直水力坡降2个方面,分析渗流场变化特征。研究表明:在洞室周边平行层理面点安全系数为1.02～1.25,垂直层理面点安全系数为1.95～2.00。在补水隧道及注水孔组成的人工水幕系统作用下,建设期内地下水位下降3～5 m,地下水位距洞室顶55 m。开挖洞室附近平均垂直水力坡降大于1.0,满足设计规范及密封性要求。
Aiming at analyses of surrounding rock stability of cavern group and seepage field characteristics at Dalian water-tight underground oil storage,firstly,based on regression analysis of in-situ stress testing data,initial in-situ stress field inversion is conducted with functions defined with program language Fish.Secondly,after three-dimensional random joint networks with different sizes are generated with 3DEC,a new method of calculating the anisotropy permeability is proposed.Finally,stress field and displacement field of surrounding rocks are gained using coupled fluid and mechanical excavation calculations.Based on point safety factor,whose criterion is the Mohr-Coulomb one with the tensile strength,cavern group stability is quantitatively evaluated considering parallel and vertical bedding planes owing to different materials characteristics.Referring to ideas from abroad,seepage field is analyzed by groundwater table and vertical hydraulic gradient,respectively.Results indicate that point safety factor is 1.95–2.00 for the materials in the direction perpendicular to bedding planes,while 1.02–1.25 in the direction parallel to bedding planes.With the artificial water curtain system comprised of water tunnels and holes,the groundwater drops 3–5 m during construction period,and the distance between groundwater table to cavern crown is 55 m.The average vertical hydraulic gradient is greater than 1.0 around the caverns,which meets the design specification and sealing requirement.
Aiming at analyses of surrounding rock stability of cavern group and seepage field characteristics at Dalian water-tight underground oil storage,firstly,based on regression analysis of in-situ stress testing data,initial in-situ stress field inversion is conducted with functions defined with program language Fish.Secondly,after three-dimensional random joint networks with different sizes are generated with 3DEC,a new method of calculating the anisotropy permeability is proposed.Finally,stress field and displacement field of surrounding rocks are gained using coupled fluid and mechanical excavation calculations.Based on point safety factor,whose criterion is the Mohr-Coulomb one with the tensile strength,cavern group stability is quantitatively evaluated considering parallel and vertical bedding planes owing to different materials characteristics.Referring to ideas from abroad,seepage field is analyzed by groundwater table and vertical hydraulic gradient,respectively.Results indicate that point safety factor is 1.95–2.00 for the materials in the direction perpendicular to bedding planes,while 1.02–1.25 in the direction parallel to bedding planes.With the artificial water curtain system comprised of water tunnels and holes,the groundwater drops 3–5 m during construction period,and the distance between groundwater table to cavern crown is 55 m.The average vertical hydraulic gradient is greater than 1.0 around the caverns,which meets the design specification and sealing requirement.
引文
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[13]聂卫平,徐卫亚,周先齐.基于三维弹塑性有限元的洞室稳定性参数敏感性灰关联分析[J].岩石力学与工程学报,2009,28(增2):3 885–3 893.(NIE Weiping,XU Weiya,ZHOU Xianqi.Greyrelation analysis of parameter sensitivity of cavern stability based on3D elastoplastic finite elements[J].Chinese Journal of Rock Mechanicsand Engineering,2009,28(Supp.2):3 885–3 893.(in Chinese))
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[15]高翔,谷兆祺.人工水幕在不衬砌地下贮气洞室工程中的应用[J].岩石力学与工程学报,1997,16(2):178–187.(GAO Xiang,GUZhaoqi.The application of artificial water curtain to unlined gas storagecaverns[J].Chinese Journal of Rock Mechanics and Engineering,1997,16(2):178–187.(in Chinese))
[2]王芝银,郭书太,李云鹏,等.地下储油岩洞数值模拟的正交试验设计[J].油气储运,2006,25(9):33–35,62.(WANG Zhiyin,GUO Shutai,LI Yunpeng,et al.Orthogonal experimental design ofnumerical simulation for underground petroleum storage caverns[J].Oil and Gas Storage and Transportation,2006,25(9):33–35,62.(inChinese))
[3]刘贯群,韩曼,宋涛,等.地下水封石油洞库渗流场的数值分析[J].中国海洋大学学报,2007,37(5):819–824.(LIUGuangqun,HAN Man,SONG Tao,et a1.Seepage simulation ofunderground petroleum storage caverns and necessity analysis of awater curtain system[J].Periodical of Ocean University of China,2007,37(5):819–824.(in Chinese))
[4]义宗贞.国家二期石油储备基地大连地下储备库工程岩土工程勘察评价报告[R].大庆:大庆油田工程有限公司,2005.(YI Zongzhen.Geotechnical investigation and evaluation report on the nationalsecond-stage oil storage bases of Dalian underground oil storagecavern engineering in China[R].Daqing:Daqing Oilfield EngineeringCo.,Ltd.,2005.(in Chinese))
[5]于崇,李海波,李国文,等.大连地下石油储备库地应力场反演分析[J].岩土力学,2010,31(12):3894–3990.(YU Chong,LI Haibo,LI Guowen,et al.Inversion analysis of initial stress field ofDalian underground oil storage cavern[J].Rock and Soil Mechanics,2010,31(12):3 894–3 990.(in Chinese))
[6]于崇.水封式地下石油储油库洞室群围岩稳定性及渗流场分析[博士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2010.(YU Chong.Water-tight underground oil storage caverns rock storagecaverns and seepage field analysis[Ph.D.Thesis][D].Wuhan:Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,2010.(in Chinese))
[7]于崇,李海波,李国文,等.大连地下石油储备库初始渗流场数值反演[J].岩石力学与工程学报,2010,29(3):609–616.(YUChong,LI Haibo,LI Guowen,et a1.Inversion analysis of initialseepage field of Dalian underground oil storage cavern[J].ChineseJournal of Rock Mechanics and Engineering,2010,29(3):609–616.(in Chinese))
[8]宁宇,徐卫亚,郑文棠,等.白鹤滩水电站拱坝及坝肩加固效果分析及整体安全度评价[J].岩石力学与工程学报,2008,27(9):1 890–1898.(NING Yu,XU Weiya,ZHENG Wentang,et al.Reinforcement effect analysis and global safety evaluation of archdam and abutment of Baihetan hydropower station[J].ChineseJournal of Rock Mechanics and Engineering,2008,27(9):1 890–1 898.(in Chinese))
[9]王如宾,徐卫亚,石崇,等.高地震烈度区岩体地下洞室动力响应分析[J].岩石力学与工程学报,2009,28(3):568–575.(WANG Rubin,XU Weiya,SHI Chong,et al.Dynamic responseanalysis of underground rock caverns in highly seismic region[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(3):568–575.(in Chinese))
[10]杨静.锦屏水电站地应力场回归分析与坝肩槽开挖高边坡稳定性三维非线性有限元分析[硕士学位论文][D].成都:四川大学,2003.(YANG Jing.Analysis of initial stress field regression andexcavating abutment high slope using three-dimensional nonlinearfinite element method on Jinping hydropower station[M.S.Thesis][D].Chengdu:Sichuan University,2003.(in Chinese))
[11]孙粤琳.拱坝坝肩抗滑稳定的有限元仿真模型及其应用[硕士学位论文][D].南京:河海大学,2005.(SUN Yuelin.Finite elementsimulation model of abutment stability against sliding in arch damand its application[M.S.Thesis][D].Nanjing:Hohai University,2005.(in Chinese))
[12]杨清平.重力坝坝踵应力控制标准和抗滑稳定分析[硕士学位论文][D].大连:大连理工大学,2000.(YANG Qingping.The stresscontrol criterion in heel of gravity dam and analysis of stability againstsliding[M.S.Thesis][D].Dalian:Dalian University of Technology,2000.(in Chinese))
[13]聂卫平,徐卫亚,周先齐.基于三维弹塑性有限元的洞室稳定性参数敏感性灰关联分析[J].岩石力学与工程学报,2009,28(增2):3 885–3 893.(NIE Weiping,XU Weiya,ZHOU Xianqi.Greyrelation analysis of parameter sensitivity of cavern stability based on3D elastoplastic finite elements[J].Chinese Journal of Rock Mechanicsand Engineering,2009,28(Supp.2):3 885–3 893.(in Chinese))
[14]中华人民共和国国家标准编写组.GB50455—2008地下水封石油洞库设计规范[S].北京:中国计划出版社,2009.(The NationalStandards Compilation Group of People s Republic of China.GB50455—2008 Code for design of underground oil storage in rockcaverns[S].Beijing:China Planning Press,2009.(in Chinese))
[15]高翔,谷兆祺.人工水幕在不衬砌地下贮气洞室工程中的应用[J].岩石力学与工程学报,1997,16(2):178–187.(GAO Xiang,GUZhaoqi.The application of artificial water curtain to unlined gas storagecaverns[J].Chinese Journal of Rock Mechanics and Engineering,1997,16(2):178–187.(in Chinese))
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