摘要
尾砂是矿山充填的主体材料,属典型松散介质,在外力及自重作用下具有明显的压密特性。不同压密条件下尾砂物理力学性质也随之变化,但迄今还没有较合理的计算方法。以大红山铜矿尾砂为研究对象,采用origin软件自定义函数对尾砂三联杆高压固结试验结果进行拟合分析,得到尾砂密度随外加载荷变化的关系满足幂函数特征。通过分析采场内尾砂微元体自重条件下的受力平衡条件,得到大空区尾砂充填体密度随高度的变化关系满足幂函数特征,函数为可积分函数,尾砂密度随高度的增大而增大,增长速率逐渐减小。Fluent数值模拟计算结果和工业试验结果表明,所得尾砂充填体自重压密模型与实际情况相符很好,具有较高的工程指导价值。
Tailings is the main filling material for mines, which belongs to the typical loose medium and has obvious compressibility under the action of external force and its gravity. Its physical mechanical properties will change with the compaction conditions, but there is no reasonable calculation method to predict these properties of the tailings so far. The tailings of Dahongshan copper mine are used as an example in this study, where a mathematical relationship between density of the tailings and the load which meets the characteristics of the power function is obtained employing a user-defined function in original software that is fitted with the results of the high pressure consolidation test. The mathematical relationship between density of the tailings filling body of a large goaf and the height which meets characteristics of the power function is derived by analyzing the vertical forces balanced of the unit volume of the tailings, the function is integrable, it can be known form the function, density of the tailings increases with the height, the growth rate decreases gradually. The results of the numerical simulation and the industrial field test show that the compaction model of the tailings filling body under its dead weight is in agreement with the real conditions; so that the model has high practical value in engineering. © 2016, Science Press. All right reserved.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2016年第S2期403-409,共7页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51164016)
甘肃省科技重大专项计划项目(No.1203GKDC003)~~
关键词
尾砂
压缩特性
自重
密度
Copper mines
Density (specific gravity)
Filling
Functions
Software testing
Tailings
