金沙江阿海水电站混凝土重力坝地震抗滑稳定性的时程法分析
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摘要
通过动力有限元时程法分析了金沙江阿海混凝土重力坝在设计地震动(0.344g)作用下的动态响应,计算模型考虑了动水压力作用、大坝-岩基相互作用,用黏弹性吸波边界模拟了地震动能量向无限远域逸散的地基"辐射阻尼"效应。通过将坝体惯性力时程极大值与振型分解反应谱法的惯性力极值对比,从而验证了复杂动力数值模拟结果的正确性,为后续分析打下了基础。采用沿滑面的应力积分法得到了大坝沿建基面的瞬态抗滑安全系数时程。计算结果表明:阿海重力坝在设计地震动(0.344g)作用下的安全系数时程的极小值为1.146,大坝整体稳定性良好,可不采取提高整体抗滑稳定性的工程加固措施。作为重大工程典型实例研究,采用的计算方法和所得结果对类似大坝工程抗震研究具有参考意义。
Time-history analysis using dynamic FEM is employed to compute the seismic response of Ahai concrete gravity dam at the Jinsha River subjected to design earthquake loading.The hydrodynamic pressures and dam-foundation interaction are considered in the FEM model;and the foundation radiation damping effect of the seismic motion energy dissipating towards infinite domain is simulated as well.Firstly,the complex numerical simulation results are validated by comparison of dam body's maximum inertial forces between time-history analysis and spectrum method.Then,the following evaluation of the sliding stability of the dam can be conducted.The time history of anti-sliding safety factor is obtained using stress integration along the dam-base sliding interface.Because the minimum value of safety factor histories is 1.146;it can be concluded that the Ahai dam has a relatively enough high capability for earthquake resistance that the reinforcement to improve the anti-sliding stability is not needed.The outcome of this study should be of interest and useful to professionals involved in the design of similar large gravity dams.
Time-history analysis using dynamic FEM is employed to compute the seismic response of Ahai concrete gravity dam at the Jinsha River subjected to design earthquake loading.The hydrodynamic pressures and dam-foundation interaction are considered in the FEM model;and the foundation radiation damping effect of the seismic motion energy dissipating towards infinite domain is simulated as well.Firstly,the complex numerical simulation results are validated by comparison of dam body's maximum inertial forces between time-history analysis and spectrum method.Then,the following evaluation of the sliding stability of the dam can be conducted.The time history of anti-sliding safety factor is obtained using stress integration along the dam-base sliding interface.Because the minimum value of safety factor histories is 1.146;it can be concluded that the Ahai dam has a relatively enough high capability for earthquake resistance that the reinforcement to improve the anti-sliding stability is not needed.The outcome of this study should be of interest and useful to professionals involved in the design of similar large gravity dams.
引文
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[2]何建涛,张伯艳,李德玉,等.官地重力坝静动力分析[J].水利水电技术,2009,40(5):35-38.HE Jian-tao,ZHANG Bo-yan,LI De-yu,et al.Static and dynamic analysis of Guandi gravity dam[J].Water Resources and Hydropower Engineering,2009,40(5):35-38.
[3]常晓林,位敏,高作平.高地震烈度下金安桥碾压混凝重力坝动力分析[J].水利水电技术,2005,36(7):57-63.CHANG Xiao-lin,WEI Min,GAO Zuo-ping.Dynamic analysis of Jin'anqiao RCC gravity dam under high seismic intensity[J].Water Resources and Hydropower Engineering,2005,36(7):57-63.
[4]陈厚群,侯顺载,杨大伟.地震条件下拱坝库水相互作用的试验研究[J].水利学报,1987,6:29-39.CHEN Hou-qun,HOU Shun-zai,YANG Da-wei.Study of arch dam-reservoir water interaction under earthquake condition[J].Journal of Hydraulic Engineering,1987,6:29-39.
[5]中国水利水电科学研究院.DL5073-2000水工建筑物抗震设计规范[S].北京:中国电力出版社,2000.
[6]FINN W D L.State-of-the-art of geotechnical earthquake engineering practice[J].Soil Dynamics and Earthquake Engineering,2000,20(1):1-15.
[7]吕涛,李海波,杨建宏,等.溪洛渡地下洞室群地震响应的二维及三维数值模型比较分析研究[J].岩土力学,2009,30(3):721―728.LüTao,LI Hai-bo,YANG Jian-hong,et al.Comparison between 2D and 3D numerical analysis for seismic response of Xiluodu underground caverns[J].Rock and Soil Mechanics,2009,30(3):721-728.
[8]KONTOE S,ZDRAVKOVIC L,POTTS D M.An assessment of time integration schemes for dynamic geotechnical problems[J].Computers and Geotechnics,2008,35(2):253-264.
[9]ZHANG C H,PAN J W,WANG J T.Influence of seismic input mechanisms and radiation damping on arch dam response[J].Soil Dynamics and Earthquake Engineering,2009,29(9):1282-1293.
[10]潘坚文,张楚汉,徐艳杰.强震输入方式与地基模型对重力坝反应的影响[J].岩土工程学报,2010,32(1):82-88.PAN Jian-wen,ZHANG Chu-han,XU Yan-jie.Influence of seismic input mechanism and foundation models on response of gravity dams[J].Chinese Journal of Geotechnical Engineering,2010,32(1):82-88.
[11]黄诚,王安明,任伟中.水平向与竖向地震动的时间遇合模式对边坡动力安全系数的影响[J].岩土力学,2010,31(11):3404-3410.HUANG Cheng,WANG An-ming,REN Wei-zhong.Influence of time combination pattern of horizontal and vertical ground motions on slope seismic safety factor[J].Rock and Soil Mechanics,2010,31(11):3404-3410.
[12]LI Q S,LI Z N,LI G Q,et al.Experimental and numerical seismic investigations of the Three Gorges dam[J].Engineering Structures,2005,27(4):501-513.
[13]LONG Y C,ZHANG C H,XU Y J.Nonlinear seismic analyses of a high gravity dam with and without the presence of reinforcement[J].Engineering Structures,2009,31(10):2486-2494.
[14]JAVANMARDI F,LéGER P,TINAWI R.Seismic structural stability of concrete gravity dams considering transient uplift pressures in cracks[J].Engineering Structures,2005,27(4):616-628.
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