地震载荷作用下地下厂房围岩稳定性分析
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摘要
探讨了非连续变形分析方法(DDA)动力学算法中阻尼条件施加方法,并针对具体实际问题采用速度阈值控制的复合阻尼方法提高了计算效率。以某水电工程地下主厂房为例,采用改进后非连续变形分析方法对汶川地震载荷作用下节理围岩和洞室开挖过程中锚杆的锚固作用及对边墙稳定性的影响进行研究,重点对比分析了地震载荷下洞室围岩在有无锚固条件对于拱顶、边墙和节理位移变形位移的影响。研究表明,锚杆的锚固作用对地震载荷和高应力条件下地下厂房开挖过程中洞室围岩的变形和稳定性起着关键性的作用。
The damping dynamics algorithm of discontinuous deformation analysis( DDA) was discussed,and the composite damping method with velocity threshold control based on practical problems improved the computational efficiency. The underground powerhouse of a hydropower project was taken as an example,the improved DDA algorithm under Wenchuan seismic loading was used to study the anchoring effect in the process of chamber excavation on the surrounding wall deformation,joint deformation displacement. It is shown that the reinforcement with rockbolts will bring great effects on rock surroundings in controlling deformation,stress distribution and stability.
The damping dynamics algorithm of discontinuous deformation analysis( DDA) was discussed,and the composite damping method with velocity threshold control based on practical problems improved the computational efficiency. The underground powerhouse of a hydropower project was taken as an example,the improved DDA algorithm under Wenchuan seismic loading was used to study the anchoring effect in the process of chamber excavation on the surrounding wall deformation,joint deformation displacement. It is shown that the reinforcement with rockbolts will bring great effects on rock surroundings in controlling deformation,stress distribution and stability.
引文
[1]张雨霆,肖明,李玉婕.汶川地震对映秀湾水电站地下厂房的震害影响及动力响应分析[J].岩石力学与工程学报,2010,29(增2):3 663-3 671.(Zhang Yuting,Xiao Ming,Li Yujie.Effect of Wenchuan Earthquake on earthquake damage and dynamic response of underground powerhouse of Yingxiuwan Hydropower Station[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(Supp.2):3 663-3 671.(in Chinese))
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[9]姜清辉,朱传云.动力学问题的DDA方法及其在爆破抛掷过程中的应用[J].工程爆破,2004,10(3):5-8.(Jiang Qinghui,Zhu Zhuanyun.Discontinuous deformation analysis for dynamics and its application in modeling of blasting throwing process[J].Engineering Blasting,2004,10(3):5-8.(in Chinese))
[10]姜清辉,周创兵,漆祖芳.基于Newmark积分方案的DDA方法[J].岩石力学与工程学报,2009,28(增1):2 778-2 783.(Jiang Qinghui,Zhou Chuangbin,Qi Zufang.Discontinuous deformation analysis method based on Newmark integration algorithm[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(supp.1):2 778-2 783.(in Chinese))
[11]Y.Y.Jiao,Viscous boundary of DDA for modeling stress wave propagation in jointed rock[J],International Journal of Rock Mechanics&Mining Sciences,2007,44:1 070-1 076.
[12]Jian-Hong Wu,Chun-Hwa Chen,Application of DDA to simulate characteristics of the Tsaoling landslide[J],Computers and Geotechnics,2011,38:741-750.
[13]Jian-Hong Wu,Seismic landslide simulations in discontinuous deformation analysis[J],Computers and Geotechnics,2010,37:594-601.
[14]刘永茜,杨军.一种改进步长自调的非连续变形分析法[J].岩土力学,2011,32(8):2 544-2 548.(Liu Yongxi,Yang Jun.An improved DDA method with adaptive step size[J].Rock and Soil Mechanics,2011,32(8):2 544-2 548.(in Chinese))
[15]甯尤军,杨军,陈鹏万.DDA方法中的两种无反射边界研究[J].工程力学,2010,27(4):19-23.(Ning You-jun,Yang Jun,Chen Peng-wan.Two non-reflecting boundary conditions in DDA method[J].Engineering Mechanics,2010,27(4):19-23.(in Chinese))
[16]赵武胜,陈卫忠,郑朋强,等.地下工程数值计算中地震动输入方法选择及实现[J].岩石力学与工程学报,2013,32(8):1 579-1 587.(Zhao Wusheng,Chen Weizhong,Zheng Pengqiang,et al.Choice and implementation of seismic wave input method in numerical calculation for underground engineering[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(8):1 579-1 587.(in Chinese))
[2]Youssef M.A.Hashash,Jefrey J.Hook,Birger Schmidt,et al.Seismic design and analysis of underground structures[J].Tunneling and Underground Space Technology,2001,16(4):247-293.
[3]Seyyed M Hasheminejad,Kazemirad Siavash.Dynamic response of an eccentrically lined circular tunnel in poroelastic soil under seismic excitation[J].Soil Dynamics and Earthquake Engineering,2008,28(4):277-292.
[4]Nam Sang Hyeok,Song Ha Won,Byun Keun Joo,et al.Seismic analysis of underground reinforced concert structures considering elasto-plastic interface element with thickness[J].Engineering Structures,2006,28(8):1 122-1 131.
[5]李海波,马行东,李俊如.地震荷载作用下地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.Study on influence factors of rock cavern displacement under earthquake[J].Chinese Journal of Geotechnical Engineering,2006,28(3):358-362.(in Chinese))
[6]马行东,李海波.地震波入射方向对地下岩体洞室动态响应的初步分析[J].水力发电,2007,33(1):23-25.(Ma Xingdong,Li Haibo.Primary analysis of different incidence propagation on dynamic response of underground rock cavern under earthquake[J].Journal of Hydroelectric Engineering,2007,33(1):23-25.(in Chinese))
[7]隋斌,朱维申,李晓静.地震荷载作用下大型地下洞室群的动态响应模拟[J].岩土工程学报,2008,30(12):1 877-1 882.(Sui Bin,Zhu Weishen,Li Xiaojing.Simulation on dynamic response of large underground opening complex under seismic loads[J].Chinese Journal of Geotechnical Engineering,2008,30(12):1 877-1 882.(in Chinese))
[8]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 Weidong,Shi Chong,et al.Dynamic response analysis of rock underground caverns in high seismic region[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(3):568-575.(in Chinese))
[9]姜清辉,朱传云.动力学问题的DDA方法及其在爆破抛掷过程中的应用[J].工程爆破,2004,10(3):5-8.(Jiang Qinghui,Zhu Zhuanyun.Discontinuous deformation analysis for dynamics and its application in modeling of blasting throwing process[J].Engineering Blasting,2004,10(3):5-8.(in Chinese))
[10]姜清辉,周创兵,漆祖芳.基于Newmark积分方案的DDA方法[J].岩石力学与工程学报,2009,28(增1):2 778-2 783.(Jiang Qinghui,Zhou Chuangbin,Qi Zufang.Discontinuous deformation analysis method based on Newmark integration algorithm[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(supp.1):2 778-2 783.(in Chinese))
[11]Y.Y.Jiao,Viscous boundary of DDA for modeling stress wave propagation in jointed rock[J],International Journal of Rock Mechanics&Mining Sciences,2007,44:1 070-1 076.
[12]Jian-Hong Wu,Chun-Hwa Chen,Application of DDA to simulate characteristics of the Tsaoling landslide[J],Computers and Geotechnics,2011,38:741-750.
[13]Jian-Hong Wu,Seismic landslide simulations in discontinuous deformation analysis[J],Computers and Geotechnics,2010,37:594-601.
[14]刘永茜,杨军.一种改进步长自调的非连续变形分析法[J].岩土力学,2011,32(8):2 544-2 548.(Liu Yongxi,Yang Jun.An improved DDA method with adaptive step size[J].Rock and Soil Mechanics,2011,32(8):2 544-2 548.(in Chinese))
[15]甯尤军,杨军,陈鹏万.DDA方法中的两种无反射边界研究[J].工程力学,2010,27(4):19-23.(Ning You-jun,Yang Jun,Chen Peng-wan.Two non-reflecting boundary conditions in DDA method[J].Engineering Mechanics,2010,27(4):19-23.(in Chinese))
[16]赵武胜,陈卫忠,郑朋强,等.地下工程数值计算中地震动输入方法选择及实现[J].岩石力学与工程学报,2013,32(8):1 579-1 587.(Zhao Wusheng,Chen Weizhong,Zheng Pengqiang,et al.Choice and implementation of seismic wave input method in numerical calculation for underground engineering[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(8):1 579-1 587.(in Chinese))
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