栗西尾矿坝地震反应分析和稳定性评价
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摘要
【目的】对尾矿库进行加高后其在地震荷载作用下的动力反应进行分析,为对栗西尾矿坝的加高设计提供参考。【方法】基于实际钻孔勘探的成果,在确定了各分区-尾矿砂和初期坝堆石体模型的渗透系数、物理力学指标及加高方案下的浸润面分布条件下,采用等价粘弹性模型的三维有效应力有限元法,对栗西尾矿坝加高以后的坝体进行了地震永久残余变形、液化分析和边坡稳定分析,求得残余变形、孔压水平分布场和边坡安全系数。【结果】在地震作用下,尾矿坝坝内在靠近水边的沉积滩液化区,由于其藏埋较浅加之高孔隙水压力梯度的存在,将导致沉积滩表面出现裂缝喷冒现象。【结论】在加高方案设计中应设排渗设施,以降低地下水位,提高尾矿坝边坡稳定性。
【Objective】 The study was conducted to make the heightening design of the Lixi Tailings Dam,and to analyze the dynamic response under the earthquake when it is heightened.【Method】 According to the permeability and physical mechanical parameters of the two zones,the tailing sand and the rock fill of initial dam and the distribution of saturation surface under the heightening design plan were determined by the drilling exploration result.The equivalent viscous-spring constitutive mode was used in the 3D effective stress FEM analysis,and permanent deformation,liquefaction and stability analysis of earthquake response of the Lixi Tailing Dam were performed.【Result】 From the calculation,it is concluded that the deposit beach liquefaction region is close to water leads to the crack,spray phenomena,because the storage is shallow and the pore water pressure is high under the earthquake.【Conclusion】 The measures to lay drain pipes in the design of enlarging the volume are proposed.
【Objective】 The study was conducted to make the heightening design of the Lixi Tailings Dam,and to analyze the dynamic response under the earthquake when it is heightened.【Method】 According to the permeability and physical mechanical parameters of the two zones,the tailing sand and the rock fill of initial dam and the distribution of saturation surface under the heightening design plan were determined by the drilling exploration result.The equivalent viscous-spring constitutive mode was used in the 3D effective stress FEM analysis,and permanent deformation,liquefaction and stability analysis of earthquake response of the Lixi Tailing Dam were performed.【Result】 From the calculation,it is concluded that the deposit beach liquefaction region is close to water leads to the crack,spray phenomena,because the storage is shallow and the pore water pressure is high under the earthquake.【Conclusion】 The measures to lay drain pipes in the design of enlarging the volume are proposed.
引文
[1]谢定义,土动力学[M].西安:西安交通大学出版社,1990.Xie D Y.Soil dynamics[M].Xi’an:Publishing Company of Xi’an Jiaotong University,1990.(in Chinese)
[2]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.Zhu B L,Shen Z J.Computational soils mechanics[M].Shang-hai:Publishing Company of Science and Technology in Shang-hai,1990.(in Chinese)
[3]徐志英,周健.土坝地震孔隙水压力产生、扩展和消散的三维动分析[J].地震工程与工程振动,1985,5(4):57-72.(in Chi-nese)Xu Z Y,Zhou J.3D dynamic analysis of generation,expansionand slaking of earthquake pore water pressure to soil dam[J].Earthquake Engineering and Engineering Vibration,1985,5(4):57-72.(in Chinese)
[4]高艳平,王余庆,辛鸿博.尾矿坝地震液化简化判别法[J].岩土工程学报,1995,17(5):72-79.Gao Y P,Wang Y Q,Xin HB.Asi mplified procedure for eval-uating liquefaction potential of tailing dam[J].Chinese Journalof Geotechnical Engineering,1995,17(5):72-79.(in Chinese)
[5]陈国兴.土体地震反应分析的简化有效应力法[J].地震工程与工程振动,1995,15(2):52-61.Chen G X.Si mplified effective analysis method of earthquakeresponse for soil mass[J].Earthquake Eng-ineering and Engi-neering Vibration,1995,15(2):52-61.(in Chinese)
[6]罗晓辉,白世伟,万凯军,等.尾矿坝渗透静力稳定分析[J].岩土力学,2004,25(4):560-564.Luo X H,Bai S W,Wan K J,et al.Static stability analysis ofseepage of tailings dam[J].Rock and Soil Mechanics,2004,25(4):560-564.(in Chinese)
[7]潘建平,孔宪京,邹德高.尾矿坝地震液化稳定的简化分析[J].水利学报,2006,37(10):1224-1229.Pan J P,Kong XJ,Zou D G.Si mplified analysis of liquefactionand stability of tailing dam during earthquake[J].Journal ofHydraulic Engineering,2006,37(10):1224-1229.(in Chinese)
[2]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.Zhu B L,Shen Z J.Computational soils mechanics[M].Shang-hai:Publishing Company of Science and Technology in Shang-hai,1990.(in Chinese)
[3]徐志英,周健.土坝地震孔隙水压力产生、扩展和消散的三维动分析[J].地震工程与工程振动,1985,5(4):57-72.(in Chi-nese)Xu Z Y,Zhou J.3D dynamic analysis of generation,expansionand slaking of earthquake pore water pressure to soil dam[J].Earthquake Engineering and Engineering Vibration,1985,5(4):57-72.(in Chinese)
[4]高艳平,王余庆,辛鸿博.尾矿坝地震液化简化判别法[J].岩土工程学报,1995,17(5):72-79.Gao Y P,Wang Y Q,Xin HB.Asi mplified procedure for eval-uating liquefaction potential of tailing dam[J].Chinese Journalof Geotechnical Engineering,1995,17(5):72-79.(in Chinese)
[5]陈国兴.土体地震反应分析的简化有效应力法[J].地震工程与工程振动,1995,15(2):52-61.Chen G X.Si mplified effective analysis method of earthquakeresponse for soil mass[J].Earthquake Eng-ineering and Engi-neering Vibration,1995,15(2):52-61.(in Chinese)
[6]罗晓辉,白世伟,万凯军,等.尾矿坝渗透静力稳定分析[J].岩土力学,2004,25(4):560-564.Luo X H,Bai S W,Wan K J,et al.Static stability analysis ofseepage of tailings dam[J].Rock and Soil Mechanics,2004,25(4):560-564.(in Chinese)
[7]潘建平,孔宪京,邹德高.尾矿坝地震液化稳定的简化分析[J].水利学报,2006,37(10):1224-1229.Pan J P,Kong XJ,Zou D G.Si mplified analysis of liquefactionand stability of tailing dam during earthquake[J].Journal ofHydraulic Engineering,2006,37(10):1224-1229.(in Chinese)
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