基于有限差分法的江坪河溢洪洞出口段开挖方案对比研究
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摘要
基于项目组开发出的前处理程序,建立AUTOCAD初步建模、ANSYS进行形体切割和网格划分、FLAC3D进行模型计算的多软件联合建模模式,极大提高建模效率和精度.提出单位开挖方量对应的最大不平衡力λi的概念,结合数值模型关键点位移的检测技术和塑性区显示,针对两种开挖方案进行了对比分析.分析显示:不同开挖方案对最终位移的影响不明显,方案二的施工中的位移控制要稍优于方案一;演化过程对比说明,两方案第9步开挖的单位开挖方量对应的最大不平衡力λi比值最大,为最危险开挖步,方案二明显优于方案一,若采用方案一,第6步和第9步开挖时岩体所受开挖应力调整幅度增大,失稳可能性增大;最终塑性区为比较标准时两方案可行性相同.综合对比,方案二优于方案一.
A pre-treatment process based on the project team developed,joint multi-mode software moldelings,as AUTOCAD for preliminary modeling,ANSYS for physical cutting and meshing,FLAC3 D for model calculations.It greatly improved the efficiency and accuracy of the modelings.The concept of unbalanced force which corresponding to the largest excavation of unit amount side was Proposed.Combinating the detection technology and the plastic zone display of the key point numerical model displacement,the two programs of excavation were compared.The analysis was that different excavation programs had no significant effects on the final displacement,the construction program in the second displacement control programs were slightly better than one;The evolution contrast ofλ1shows that the unbalanced force ratio were the largest and also the most dangerous step,which corresponded to the excavation side of step 9of the two program units.It was obvious that the program two was better than that of one.Ifthe program one was opted,excavation of rock stress suffered by the adjustment would had increased and the possibility of instability would had increased when the Step 6and Step 9were excavating;The feasibility of the two programs were the same when the final plastic zone were on comparison standards.Comprehensive comparising,theprogram two is better than program one.
A pre-treatment process based on the project team developed,joint multi-mode software moldelings,as AUTOCAD for preliminary modeling,ANSYS for physical cutting and meshing,FLAC3 D for model calculations.It greatly improved the efficiency and accuracy of the modelings.The concept of unbalanced force which corresponding to the largest excavation of unit amount side was Proposed.Combinating the detection technology and the plastic zone display of the key point numerical model displacement,the two programs of excavation were compared.The analysis was that different excavation programs had no significant effects on the final displacement,the construction program in the second displacement control programs were slightly better than one;The evolution contrast ofλ1shows that the unbalanced force ratio were the largest and also the most dangerous step,which corresponded to the excavation side of step 9of the two program units.It was obvious that the program two was better than that of one.Ifthe program one was opted,excavation of rock stress suffered by the adjustment would had increased and the possibility of instability would had increased when the Step 6and Step 9were excavating;The feasibility of the two programs were the same when the final plastic zone were on comparison standards.Comprehensive comparising,theprogram two is better than program one.
引文
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[14]吕爱钟.地下洞室最优开挖形状的确定方法[J].岩石力学与工程学报,1996,15(3):193-200.(Lv Aizhong.The method for optimum shapes of tunnels and cavities[J].Chinese Journal of Rock Mechanics and Engineering,1996,15(3):193-200.(in Chinese))
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[17]王刚,李术才,王书刚,隋斌等.节理岩体大型地下洞室群稳定性分析[J].岩土力学,2008,29(1):261-268.(Wang Gang,Li Shucai,Wang Shugang,et al.Stability analysis of huge underground cavern group in jointed rockmass[J].Rock and Soil Mechanics,2008,29(1):261-268.(in Chinese))
[18]肖明.地下洞室施工开挖三维动态过程数值模拟分析[J].岩土工程学报,2000,22(4):421-425.(Xiao Ming,Three-dimensional numerical model of construction process for underground opening[J].Chinese Journal of Geotechnical Engineering,2000,22(4):421-425.(in Chinese))
[19]余卫平,耿克勤,汪小刚.某水电站地下厂房洞室群围岩稳定分析[J].岩土力学,2004,25(12):1955-1960.(Yu Weiping,Geng Keqin,Wang Xiaogang.Stability analysis of surrounding rock of underground openings of a hydropower station[J].Rock and Soil Mechanics,2004,25(12):1955-1960.(in Chinese))
[2]刘杰,李建林,邓华锋等.宜昌砂岩三角波加载段变形速率预测模型研究[J].岩石力学与工程学报,2010,29(3):633-639.(Liu Jie,Li Jianlin,Deng Huafeng etc.Study of prediction model for triangular wave loading section deformation rate of yichang sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(3):633-639.(in Chinese))
[3]刘杰,李建林等,基于有限元分析的岩质边坡稳定性模糊评判方法研究[J].岩石力学与工程学报,2007,7:3438-3445.(Liu Jie,Li Jianlin,Hu Hailang.Study on fuzzy evaluation method of rock slope stability based on finite element analysis[J].Chinese Journal of Rock Mechanics and Engineering,2007,7:3438-3445.(in Chinese))
[4]李建林,刘杰,王乐华等.多因素作用下隔河岩电站厂房高边坡变形机理及岩体稳定性研究[J].岩土工程学报,2007,9:1289-1295.(Li Jianlin,Liu Jie,Wang Lehua.Studies on deformation mechanism and rock mass stability of high slopes of Geheyan power station under multiple factors[J].Chinese Journal of Geotechnical Engineering,2007,9:1289-1295.(in Chinese))
[5]李建林,刘杰.隔河岩水电站厂房后边坡与拱坝的相互作用研究[J].岩石力学与工程学报,2007,3:459-466.(Li Jianlin,Liu Jie.Study on interaction between back powerhouse slope and arch dam of Geheyan hydropower station[J].Chinese Journal of Rock Mechanics and Engineering,2007,3:459-466.(in Chinese))
[6]刘杰,李建林等.基于拟静力分析法的大岗山坝肩边坡地震工况稳定性研岩[J].岩石力学与工程学报,2009,28(08):1562-1570.(Liu Jie,Li Jianlin,Zhang Yudeng.Stability analysis of Dagangshan dam abutment slope under earthquake based on pseudo-static method[J].Chinese Journal of Rock Mechanics and Engineering,2009,8,28(08):1562-1570.(in Chinese))
[7]李术才,朱维申,陈卫忠.小浪底地下洞室群施工顺序优化分析[J].煤炭学报,1996,21(4):393-398.(Li Shucai,Zhu Weishen,Chen Weizhong.Optimiza-tion ofconstruction sequence for excavation of a group of underground chambers in Xiaolangdi water conservancy project[J].Journal of China Coal Society,1996,21(4):393-398.(in Chinese))
[8]杨典森,陈卫忠,杨为民等.龙滩地下洞室群围岩稳定性分析[J].岩土力学,2004,25(3):391-395.(Yang Diansen,Chen Weizhong,Yang Weimin,et al.Stability analysis of surrounding rock mass of Longtan underground caverns[J].Rock and Soil Mechanics,2004,25(3):391-395.(in Chinese))
[9]李建林,王乐华,刘杰等.《岩石边坡工程》(专著),2006,6.中国水利水电出版社,国标书号:7-5084-3818-3.
[10]陈卫忠,李术才,朱维申等.急倾斜层状岩体中巨型地下洞室群开挖施工理论与优化研究[J].岩石力学与工程学报,2004,23(19):3281-3287.(Chen Weizhong,Li Shucai,Zhu Weishen,et al.Excavation and optimization theory for giant underground caverns constructed in high dipping laminar strata[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(19):3281-3287.(in Chinese))
[11]杨明举,常艄东.超大型地下洞室群施工开挖程序及围岩稳定分析[J].西南交通大学学报(自然科学版),2000,35(1):32-35.(Yang Mingju,Chang Shaodong.The excavation procedure of super-large underground chambers and the surrounding rock stability[J].Journal of Southwest Jialtong Univesrity,2000,35(1):32-35.(in Chinese))
[12]杨典森,李术才,陈卫忠,等.龙滩水电站地下洞室群施工顺序及稳定性分析[J].岩石力学与工程学报,2003,22(s1):2454-2458.(Yang Diansen,Li Shucai,Chen Weizhong,et al.Construction sequences and stability analysis of Longtan underground houses[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(s1):2454-2458.(in Chinese))
[13]白明洲,黄国明.某工程大型地下厂房围岩应力状态研究[J].地质灾害与环境保护,2000,11(1):67-71.(Bai Mingzhou,Huang Guoming.Study on stress state of surrounding rockmass of a huge underground powerhouse[J].Journal of Geological Hazards and Environment Preservation,2000,11(1):67-71.(in Chinese))
[14]吕爱钟.地下洞室最优开挖形状的确定方法[J].岩石力学与工程学报,1996,15(3):193-200.(Lv Aizhong.The method for optimum shapes of tunnels and cavities[J].Chinese Journal of Rock Mechanics and Engineering,1996,15(3):193-200.(in Chinese))
[15]鄢建华,汤雷.水工地下工程围岩稳定性分析方法现状与发展[J].岩土力学,2003,24(增):681-686.(Yan Jianhua,Tang Lei.Current status and tendency ofanalyzing methods for stability of rockmass surrounding underground hydraulic works[J].Rock and Soil Mechanics,2003,24(Supp.):681-686.(in Chinese))
[16]茹忠亮,冯夏庭,张友良,等.地下工程锚固岩体有限元分析的并行计算[J].岩石力学与工程学报,2005,24(l):13-17.(Ru Zhongliang,Feng Xiating,Zhang Youliang,et al.Parallel finite element method analysis of bolted rock mass in underground engineering[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(l):13-17.(in Chinese))
[17]王刚,李术才,王书刚,隋斌等.节理岩体大型地下洞室群稳定性分析[J].岩土力学,2008,29(1):261-268.(Wang Gang,Li Shucai,Wang Shugang,et al.Stability analysis of huge underground cavern group in jointed rockmass[J].Rock and Soil Mechanics,2008,29(1):261-268.(in Chinese))
[18]肖明.地下洞室施工开挖三维动态过程数值模拟分析[J].岩土工程学报,2000,22(4):421-425.(Xiao Ming,Three-dimensional numerical model of construction process for underground opening[J].Chinese Journal of Geotechnical Engineering,2000,22(4):421-425.(in Chinese))
[19]余卫平,耿克勤,汪小刚.某水电站地下厂房洞室群围岩稳定分析[J].岩土力学,2004,25(12):1955-1960.(Yu Weiping,Geng Keqin,Wang Xiaogang.Stability analysis of surrounding rock of underground openings of a hydropower station[J].Rock and Soil Mechanics,2004,25(12):1955-1960.(in Chinese))
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