高压下尾矿材料幂函数型摩尔强度特性研究
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摘要
高压下尾矿材料的强度特性是高尾矿坝稳定性分析的基础。理论推导了幂函数型摩尔(Mohr)强度通式S(σ)=aσn+b须满足的条件为a≥0,b≥0,1/2≤n≤1;基于高压三轴试验研究了尾矿材料的强度特征,研究表明:幂函数型摩尔强度包络线能较好地反应尾矿材料在高压下的强度特征;尾矿材料在高压作用下试验前、后的颗粒分析结果表明:当围压达到某一阈值时,尾矿材料在剪切过程中将发生颗粒破碎,对于德兴铜矿尾粉砂,阈值为1 200 kPa;对于德兴铜矿尾亚砂,阈值为1 600 kPa。研究成果可为高尾矿坝坝体稳定性评价提供理论依据。
It is necessary for stability analysis of high tailings dams to grasp the strength property of tailings material under high pressures.The theoretical derivation of a general power function based on the Mohr criterion must satisfy restrictions {,,}.The high stress traixial test results indicate that the power function of Mohr criterion reflects the strength characteristics of tailings material well under high pressures.The grain-size distribution curves of the pre-and post-test show that tailings material particles will crush in the cutting process when the confining pressure reaches or exceeds the threshold value.The threshold value for tailings silt of copper mine in Dexing is 1 200 kPa,and for tailings sub-silt of copper mine in Dexing is 1 600 kPa.Research results can provide the theoretical basis for the stability analysis of high tailings dams.
It is necessary for stability analysis of high tailings dams to grasp the strength property of tailings material under high pressures.The theoretical derivation of a general power function based on the Mohr criterion must satisfy restrictions {,,}.The high stress traixial test results indicate that the power function of Mohr criterion reflects the strength characteristics of tailings material well under high pressures.The grain-size distribution curves of the pre-and post-test show that tailings material particles will crush in the cutting process when the confining pressure reaches or exceeds the threshold value.The threshold value for tailings silt of copper mine in Dexing is 1 200 kPa,and for tailings sub-silt of copper mine in Dexing is 1 600 kPa.Research results can provide the theoretical basis for the stability analysis of high tailings dams.
引文
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[17]LOBO-GUERRERO S,VALLEJO L E,VESGA L F.Visualization of crushing evolution in granular materialsunder compression using DEM[J].International Journalof Geomechanics,ASCE,2006,6(3):195-200.
[18]赵光思,周国庆,朱锋盼,等.颗粒破碎影响砂直剪强度的试验研究[J].中国矿业大学学报,2008,37(3):291-294.ZHAO Guang-si,ZHOU Guo-qing,ZHU Feng-pan,et al.Experimental research on the influence of particlecrushing on direct shear strength of sand[J].Journal ofChina University of Mining&Technology,2008,37(3):291-294.
[19]孔德志,张其光,张丙印,等.人工堆石料的颗粒破碎率[J].清华大学学报(自然科学版),2009,49(6):795-799.KONG De-zhi,ZHANG Qi-guang,ZHANG Bing-yin,etal.Particle breakage ratio of artificial rockfill materials[J].Journal of Tsinghua University(Science&Technology),2009,49(6):795-799.
[20]HARDIN B O.Crushing of soil particles[J].Journal ofGeotechnical Engineering,ASCE,1985,111(10):1177-1192.
[2]赵彭年.二次抛物线型极限曲线的巷道围岩应力及位移[J].有色金属,1979,(1):41-44.
[3]李顺群,焦学英,王芳.Mohr包线的二次曲线形式[J].辽宁工程技术大学学报,2005,24(6):853-855.LI Shun-qun,JIAO Xue-ying,WANG Fang.Study ofconic for Mohr curve[J].Journal of Liaoning TechnicalUniversity,2005,24(6):853-855.
[4]陈卫忠,刘豆豆,杨建平,等.大理岩卸围压幂函数型Mohr强度特性研究[J].岩石力学与工程学报,2008,27(11):2214-2220.CHEN Wei-zhong,LIU Dou-dou,YANG Jian-ping,et al.Power function based Mohr strength criterion for marblewith unloading confining pressures[J].Chinese Journalof Rock Mechanics and Engineering,2008,27(11):2214-2220.
[5]俞茂宏.双剪理论及其应用[M].北京:科学出版社,1998.
[6]殷家瑜,赖安宁,姜朴.高应力下尾矿砂的强度与变形特性[J].岩土工程学报,1980,2(2):1-10.YIN Jia-yu,LAI An-ning,JIANG Pu.Strength anddeformation characteristics of tailings under highpressure[J].Chinese Journal of GeotechnicalEngineering,1980,2(2):1-10.
[7]CHARLES J A,WATTS K S.The influence of confiningpressure on the shear strength of compacted rockfill[J].Geotechnique,1980,30(4):353-367.
[8]YANG Xiao-li,YIN Jian-hua.Linear Mohr-Coulombstrength parameters from the non-linear Hoek-Brown rockmasses[J].International Journal of Non-LinearMechanics,2006,41(8):1000-1005.
[9]AL-AJMI AM,ZIMMERMAN RW.Stability analysis ofvertical boreholes using the Mogi-Coulomb failurecriterion[J].International Journal of Rock Mechanicsand Mining Sciences,2006,43(8):1200-1211.
[10]陈惠发,萨里普.Elasticity and plasticity[M].北京:中国建筑工业出版社,2005.
[11]李春光,郑宏,葛修润,等.双参数抛物型Mohr强度准则及其材料破坏规律研究[J].岩石力学与工程学报,2005,24(24):4428-4433.LI Chun-guang,ZHENG Hong,GE Xiu-run,et al.Research on two-parameter parabolic Mohr strengthcriterion and its damage regularity[J].Chinese Journal ofRock Mechanics and Engineering,2005,24(24):4428-4433.
[12]BAKER R.Nonlinear Mohr envelopes based on triaxialdata[J].Journal of Geotechnical and Geoenviron-mental Engineering,ASCE,2004,130(5):498-506.
[13]张超,冒海军,王光进,等.德兴铜矿4号尾矿坝浸润线观测系统的建立及高坝稳定性研究[R].武汉:中国科学院武汉岩土力学研究所,2010.
[14]王风江.上游法高尾矿坝的抗震问题[J].冶金矿山设计与建设,2001,33(5):10-13.WANG Feng-jiang.Anti-seismic problem of tall tailingdam constructed with upstream method[J].Metal MineDesign and Construction,2001,33(5):10-13.
[15]徐志英,沈珠江.高尾矿坝的地震液化和稳定分析[J].岩土工程学报,1981,3(4):22-31.XU Zhi-ying,SHEN Zhu-jiang.Liquefaction and stabilityanalysis of a high tailing dam under earthquakeexcitation[J].Chinese Journal of Geotechnical Engi-neering,1981,3(4):22-31.
[16]张家铭,汪稔,张阳明,等.土体颗粒破碎研究进展[J].岩土力学,2003,24(增刊2):661-665.ZHANG Jia-ming,WANG Ren,ZHANG Yang-ming,et al.Advance in studies of soil grain crush[J].Rock and SoilMechanics,2003,24(Supp.2):661-665.
[17]LOBO-GUERRERO S,VALLEJO L E,VESGA L F.Visualization of crushing evolution in granular materialsunder compression using DEM[J].International Journalof Geomechanics,ASCE,2006,6(3):195-200.
[18]赵光思,周国庆,朱锋盼,等.颗粒破碎影响砂直剪强度的试验研究[J].中国矿业大学学报,2008,37(3):291-294.ZHAO Guang-si,ZHOU Guo-qing,ZHU Feng-pan,et al.Experimental research on the influence of particlecrushing on direct shear strength of sand[J].Journal ofChina University of Mining&Technology,2008,37(3):291-294.
[19]孔德志,张其光,张丙印,等.人工堆石料的颗粒破碎率[J].清华大学学报(自然科学版),2009,49(6):795-799.KONG De-zhi,ZHANG Qi-guang,ZHANG Bing-yin,etal.Particle breakage ratio of artificial rockfill materials[J].Journal of Tsinghua University(Science&Technology),2009,49(6):795-799.
[20]HARDIN B O.Crushing of soil particles[J].Journal ofGeotechnical Engineering,ASCE,1985,111(10):1177-1192.
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