吸湿脱湿循环作用下不同围压尾砂的力学特性
Mechanical properties of tailings sand under different confining pressures and the moisture absorption and desorption cycle
投稿时间:2019-09-09  修订日期:2019-09-30
DOI:
中文关键词:  尾砂,孔隙水压,剪缩剪胀
英文关键词:tailing sand  moisture absorption and desorption  shear dilatancy  pore water pressure
基金项目:国家自然科学基金资助项目(51774187;51804164;51974163);湖南省自然科学(2019JJ50498;2017JJ3274);湖南省教育厅科研基金(17A184;18B276); #$NL
                    
作者单位
郭要辉 南华大学 资源环境与安全工程学院 湖南 衡阳
伍玲玲 南华大学 资源环境与安全工程学院 湖南 衡阳
张志军 南华大学 资源环境与安全工程学院 湖南 衡阳
田亚坤 南华大学 资源环境与安全工程学院 湖南 衡阳
窦玫琦 南华大学 资源环境与安全工程学院 湖南 衡阳
贺桂成 南华大学 资源环境与安全工程学院 湖南 衡阳
喻清 南华大学 资源环境与安全工程学院 湖南 衡阳
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中文摘要:
      为探究吸湿脱湿循环作用下湖南省某尾矿库尾砂在不同围压下力学行为的变化规律,本次试验对尾砂试样进行0—6次吸湿脱湿循环,在围压为100kPa、200kPa、300kPa的情况下分别对特定的尾砂试样进行室内常规三轴试验,得到了尾砂试样的承载能力变化趋势、吸湿脱湿循环对尾砂试样粘聚力和内摩擦角的影响、孔隙水压力与剪缩剪胀之间的关联等力学特性。试验结果表明:随着吸湿脱湿循环次数的增加,尾砂试样强度逐渐减弱且初次吸湿脱湿循环后强度下降较明显;吸湿脱湿循环导致尾砂试样内摩擦角和粘聚力下降;孔隙水压力的变化趋势在一定程度上能反映试样的剪缩剪胀特性;吸湿脱湿循环和高围压作用对试样的剪胀特性均有一定的抑制作用。
英文摘要:
      In order to explore the variation of the mechanical properties of tailings with the moisture absorption and desorption cycle under different confining pressures , by taking tailings sand from a tailings pond in Hunan Province as the research object, in this study, 0~6 moisture absorption and desorption cycles, the triaxial undrained shear test was performed on tailings samples with confining pressure of 100kPa, 200kPa and 300kPaS. this paper analyzed the mechanical properties of the changing trend of loading capacity ,The effect of moisture absorption and desorption cycle on the cohesion and internal friction Angle of tailings, and the relationship between pore water pressure and shear shrinkage and dilatation . The test results showed that when the number of moisture absorption and desorption cycles increases, the strength of the tailings sand sample was weakened, and the strength decreased obviously after the first moisture absorption and desorption cycle. In addition,the moisture absorption and desorption cycle results in the decrease of internal friction Angle and cohesion of tailings . The variation trend of pore water pressure can reflect the shear dilatancy and shrinkage characteristics of the tailings sand sample to some extent. However,the moisture absorption and desorption cycle andSthe high confining pressure have a certain inhibiting effect on the dilatancy characteristics of the samples.
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