基于有限元极限平衡法的尾矿坝坝体稳定分析
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摘要
在平面应变条件下,采用基于弹塑性应力应变分析的有限元极限平衡法对尾矿坝坝体的稳定性进行研究。该方法可较好地结合极限平衡分析方法和有限元应力分析方法的特点。通过弹塑性有限元分析,合理准确地考虑结构整体应力场的影响,进而结合Hooke-Jeeves法优化搜索最危险滑动面的位置及其对应的最小安全系数。以某尾矿坝实际工程为例,比较分析了考虑正常、洪水以及特殊工况运行下有限元极限平衡法与极限平衡条分法和有限元强度折减法在安全系数大小及滑动面形状和位置的差异,重点运用有限元极限平衡法对尾矿坝坝体的稳定性进行验算并作出安全评价,为尾矿坝的安全设计施工提供可靠依据和技术支撑。
Under the condition of plane strain,finite element limit equilibrium method is applied to evaluate the stability of tailings dam.This method can be better combined with characteristics of the limit equilibrium analysis methods and finite element stress analysis.And it is based on the elastoplastic stress-strain analysis.Considering the overall stress field of the structure reasonably and accurately;the most dangerous location of slip surface and the corresponding minimum safety factor are determined by Hooke-Jeeves optimized searching method.An example of stability analysis of tailings dam engineering practice is proposed.The differences of safety factor quantity,shape and location of slip surface among stability methods: finite element limit equilibrium method,limited equilibrium slice method and finite element shear strength reduction method,are compared and studied in the normal,flood and special conditions.The safety assessment of tailings dam is made by using finite element limit equilibrium method.The results can provide a reliable basis and technical support for the safety of the design and construction of tailings dams.
Under the condition of plane strain,finite element limit equilibrium method is applied to evaluate the stability of tailings dam.This method can be better combined with characteristics of the limit equilibrium analysis methods and finite element stress analysis.And it is based on the elastoplastic stress-strain analysis.Considering the overall stress field of the structure reasonably and accurately;the most dangerous location of slip surface and the corresponding minimum safety factor are determined by Hooke-Jeeves optimized searching method.An example of stability analysis of tailings dam engineering practice is proposed.The differences of safety factor quantity,shape and location of slip surface among stability methods: finite element limit equilibrium method,limited equilibrium slice method and finite element shear strength reduction method,are compared and studied in the normal,flood and special conditions.The safety assessment of tailings dam is made by using finite element limit equilibrium method.The results can provide a reliable basis and technical support for the safety of the design and construction of tailings dams.
引文
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[2]杨丽红,李全明,程五一,等.国内外尾矿坝事故主要危险因素的分析研究[J].中国安全生产科学技术,2008,4(5):28-31.YANG Li-hong,LI Quan-ming,CHENG Wu-yi,et al.The analysis of main risk factors about tailings damaccidents at home and abroad[J].Journal of SafetyScience and Technology,2008,4(5):28-31.
[3]钱家欢,殷宗泽.土工原理与计算[M].北京:水利水电出版社,1993.
[4]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M].北京:人民交通出版社,2007.
[5]邵龙潭,李红军.土工结构稳定分析——有限元极限平衡法及应用[M].北京:科学出版社,2011.
[6]中国有色工程设计研究总院,秦皇岛冶金设计研究总院.AQ2006-2005尾矿库安全技术规程[S].北京:煤炭工业出版社,2006.
[7]黄河水利委员会勘测规划设计研究院.SL274-2001碾压式土石坝设计规范[S].北京:中国水利水电出版社,2004.
[8]GEO-SLOPE International Ltd.User’s guide forSLOPE/W(Version 5)[M].Canada:GEO-SLOPE Inter-national Ltd.,2002.
[9]邵龙潭.土力学研究与探索[M].北京:科学出版社,2001.
[10]邵龙潭.土坝边坡及混凝土重力坝地基滑动稳定分析的广义数学规划法[硕士学位论文D].大连:大连理工大学,1989.
[11]邵龙潭,唐洪祥,韩国城.有限元边坡稳定分析方法及其应用[J].计算力学学报,2001,18(1):81-87.SHAO Long-tan,TANG Hong-xiang,HAN Guo-cheng.Finite element method for slope stability analysis with itsapplications[J].Chinese Journal of ComputationalMechanics,2001,18(1):81-87.
[12]欧自强.金属矿山尾矿坝的溃坝事故及其他有关情况简介[J].勘察科学技术,1989,6(2):30-34.Ou Zi-qiang.Accident of tailings dams in metal mines-abrief report[J].Site Investigation Science andTechnology,1989,6(2):30-34.
[13]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-556.LIU Han-long,FEI Kang,GAO Yu-feng.Time historyanalysis method of slope seismic stability[J].Rock andSoil Mechanics,2003,24(4):553-556.
[14]中国水利水电科学研究院.SL203-97水工建筑物抗震设计规范[S].北京:中国电力出版社,2001.
[15]中国建筑科学研究院.GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2002.
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