超高台阶排土场散体块度分布规律及抗剪强度参数的研究  

Research on fragmentation distribution and shear strength parameters of accumulate granulae with superhigh bench dumping site

作　　者：王光进[1] 杨春和[2] 孔祥云[3] 刘天宁[3] 

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验,武汉430071 [3]昆明理工大学建筑工程学院,昆明650093

出　　处：《岩土力学》2012年第10期3087-3092,3161,共7页Rock and Soil Mechanics

基　　金：国家重点基础研究发展规划(973)(No.2009CB724602);国家自然科学基金重点项目(No.51234004);云南省厅级项目(No.KKSY201221070);昆明理工大学校企基金(No.KKZ4201221008)

摘　　要："明显的粒径分级"是超高台阶排土场的重要特征,而散体岩土块度分布及其抗剪强度参数是影响超高台阶排土场稳定性和灾害防治的两个关键因素。针对江西某铜矿排土场,开展了现场粒径调查和散体室内试验研究,探讨了排土场散体岩土块度随排土场高度变化的分布规律,分析了散体岩土块度分布参数与其物料抗剪强度参数的定量关系式。研究结果表明,平均粒径D、粗料含量P>5 mm和最大粒径是随排土场高度的增加而明显减小,这表明排土场的堆积散体具有"明显的粒径分级"现象;"Gandin-Schuhmann模型"拟合的分布参数与排土场高度呈递减函数;分布参数B越大,粒度组成中粗颗粒含量越多,剪切强度参数内摩擦角φ值越大,且分布参数B与内摩擦角φ呈指数函数关系。研究成果可为超高台阶排土场稳定性分析及灾害防治提供理论依据。Apparent particle size grading is an important characteristic of superhigh bench dumping site;and the critical factors with the impact of its stability and disaster prevention are the fragmentation distribution and shear strength parameters of accumulate granulae.With the copper mine dumping site which has the feature of apparent particle size grading in Jiangxi province,the study of on-site particle size investigation and indoor laboratory tests are carried out.The particle-size distribution law with the changing of dumping-site height is analyzed;and quantitative relationship between the fragmentation distribution and the shear strength parameters of granulae is discussed.The research results indicate that the mean grain size D,the coarse-grain contents P5mm and the maximum grain size are increased significantly according to the decreasing of dumping-site height,which show that the dumping-site has the feature of apparent particle size grading.The distribution value B,by using the Gandin-Schuhmann model,fits the decrease with the increment of dumping-site height.The coarse particle content in the grain size composition and the internal friction angle φ of shear strength parameters increase with the obvious increment of the distribution value B.The relationship between distribution value B and the internal friction angle φ can be expressed by exponential function curve.

关 键 词：超高台阶排土场 堆积散体 块度分布 抗剪强度 

分 类 号：TU411.7[建筑科学—岩土工程]