堆石粗粒料颗粒破碎试验研究
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摘要
利用室内大型三轴试验,对堆石等粗粒料的颗粒破碎进行了分析。结果表明,颗粒破碎率随围压的增加而增加,呈非线性状态,二者之间的关系可以用双曲线表示。颗粒破碎的增加将导致粗粒料的抗剪强度降低,峰值内摩擦角与颗粒破碎率之间呈幂函数关系,不论颗粒的岩性、强度、大小、形状、级配和初始孔隙比等情况如何,试验资料都落在一个狭窄的区域,如果围压和材料的试验参数已知,则可估计颗粒破碎率。
Particle breakage of coarse aggregates is analyzed based on large-scale triaxial tests. Particle breakage index increases with the increase of confining pressures. The relationship between particle breakage index and confining pressure can be expressed by hyperbolic curves. The increasing of particle breakage will result in decreasing of the strength of coarse aggregates. The relationship between peak internal friction angle and particle breakage index can be presented as power function. Irrespective of the compressive strength of rock, particle size, angularity, gradation and initial void ratio, the experimental data fall within a narrow band. As a result, particle breakage index can be evaluated as long as confining pressures and the coefficients are obtained.
Particle breakage of coarse aggregates is analyzed based on large-scale triaxial tests. Particle breakage index increases with the increase of confining pressures. The relationship between particle breakage index and confining pressure can be expressed by hyperbolic curves. The increasing of particle breakage will result in decreasing of the strength of coarse aggregates. The relationship between peak internal friction angle and particle breakage index can be presented as power function. Irrespective of the compressive strength of rock, particle size, angularity, gradation and initial void ratio, the experimental data fall within a narrow band. As a result, particle breakage index can be evaluated as long as confining pressures and the coefficients are obtained.
引文
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[16]秦红玉.考虑颗粒破碎的粗粒料损伤模型试验研究[硕士学位论文D].南京:河海大学,2002.
[17]Vesic,A S,Clough G W.Behavior of granular materials under high stresses[J].Journal of Soils Mechanics and Foundation Division,American Society of Civil Engineers,1968,94(3):661-688.
[2]沈珠江.面板堆石坝应力应变分析的若干问题[A].中国混凝土面板堆石坝十年学术研讨会论文集(1985-1995)[C].北京:中国水利水电出版社,1995.43-50.
[3]Marsal R J.Large-scale testing of rockfill materials[J].Journal of Soils Mechanics and Foundation Division,American Society of Civil Enginees,1967,93(2):27-43.
[4]Marsal R J.Mechanical Properties of Rockfill Embankment Dam Engineering[M].Casagrande Volume,New York:Wiley,1973.109-200.
[5]郭庆国.关于粗粒土抗剪强度特性的试验研究[J].水利学报,1987,(5):59-66.GUO Qing-guo.Experimental study of shear intensity characteristic of coarse soil[J].Journal of Water Conservancy,1987,(5):59-66.
[6]柏树田.西北口混凝土面板堆石坝筑坝材料特性的试验研究[A].水利水电科学研究院科学研究论文集,第32集(结构材料、岩土与抗震工程)[C].北京:水利电力出版社,1991.19-29.
[7]沈新慧.天生桥混凝土面板堆石坝筑坝材料特性研究[A].水利水电科学研究院科学研究论文集——第32集(结构材料、岩土与抗震工程)[C].北京:水利电力出版社,1991.65-73.
[8]柏树田,周晓光.堆石在平面应变条件下的强度和应力-应变关系[J].岩土工程学报,1991,13(4):33-40.BAI Shu-tian,ZHOU Xiao-guang.Intensity and stress-strain relationship of rockfill under plane strain condition[J].Journal of Geotechnical Engineering,1991,13(4):33-40.
[9]柏树田,崔亦昊.堆石的力学性质[J].水力发电学报,1997,(3):21-30.BAI Shu-tian,CUI Yi-hao.Mechanics characteristic of rockfill[J].Journal of Hydroelectricity,1997,(3):21-30.
[10]周晓光.堆石在高应力及实际应力路径条件下的强度与变形特性研究[R].北京:中国水利水电科学研究院,1998.65-81.
[11]郭熙灵,胡辉,包承刚.堆石料颗粒破碎对剪胀性及抗剪强度的影响[J].岩土工程学报,1997,19(3):83-88.GUO Xi-lin,HU hui,BAO Cheng-gang.Effect of rockfill materials crashing on shear expansion characteristic andshear intensity[J].Journal of Geotechnical Engineering,1997,19(3):83-88.
[12]Hardin.Crushing of soil particles[J].Journal of Geotechnical Engineering,American Society of Civil Engineers,1985,111(10):1177-1192.
[13]刘汉龙,高玉峰,秦红玉,等.江苏宜兴抽水蓄能电站坝料试验研究[R].南京:河海大学,2000.LIU Han-long,GAO Yu-feng,QIN Hong-yu,et al.Experimental study of dam materials of pump-storage power plant,Yixing,Jiangsu[R].Nanjing:Hohai University,2000.
[14]秦红玉,高玉峰,刘汉龙.YS—30型应力路径大型三轴仪及其在粗粒土试验研究中的应用[A].土石坝与岩土力学技术研讨会论文集[C].北京:地震出版社,2001.217-221.
[15]秦红玉,刘汉龙,高玉峰,等.粗粒料强度和变形的大型三轴试验研究[J].岩土力学,2004,25(10):1575-1580.QIN Hong-yu,LIU Han-long,GAO Yu-feng,et al.Large scale triaxial test study of intensity and deformation of coarse materials[J].Rock and Soil Mechanics,2004,25(10):1575-1580.
[16]秦红玉.考虑颗粒破碎的粗粒料损伤模型试验研究[硕士学位论文D].南京:河海大学,2002.
[17]Vesic,A S,Clough G W.Behavior of granular materials under high stresses[J].Journal of Soils Mechanics and Foundation Division,American Society of Civil Engineers,1968,94(3):661-688.
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