摘要
饱和尾矿的稳态强度和变形特性是尾矿坝能否发生流滑破坏的关键因素,通过试验充分了解尾矿的稳态特性是尾矿坝稳定性评价的重要内容。以江西九江某尾矿坝体的尾矿为对象,进行三轴固结不排水剪切试验,研究饱和尾矿的稳态特性。结果表明:饱和松散尾矿的三轴固结不排水剪切曲线具有明显的软化特性,曲线软化程度随围压的增大而减小,同一围压下孔隙比越小软化现象越不明显。根据试验结果建立尾矿的稳态线,论证了稳态是尾矿的固有属性,即稳态线具有唯一性。指出稳态内摩擦角是尾矿变形最终可动用的有效内摩擦角,并求出尾矿稳态内摩擦角。
The steady-state strength and deformation characteristics of saturated tailings play a major role in flow slide of tailings dams. Through the tests,it is fully understood that the steady-state properties of railings is an important content for dam stability evaluation. Taking a tailing dam of Jiujiang in Jiangxi as the research object, the steady-state properties of saturated railings were studied by CU test. The results showed that triaxial shear curve of saturated loose tailings has obviously softening characteristic, and softening degree of curve decreases with increasing of confining pressure. Under the same confining pres- sure, the less the pore is, the more the softening phenomenon is not obvious. The steady line of tailings is established according to the test results, and it is proved that steady-state is inherent property of railings, namely the steady state line is unique. The steady-state internal friction angle is the effective internal friction angle that tailings deformation ultimately can utilize, and then the value of internal friction angle is calculated.
出处
《金属矿山》
CAS
北大核心
2014年第1期145-149,共5页
Metal Mine
基金
国家自然科学基金项目(编号:51204076)
江西省自然科学基金项目(编号:20114BAB216011)
江西省教育厅科学基金项目(编号:GJJ12340)
关键词
尾矿
三轴试验
稳态强度
稳态线
稳态内摩擦角
Tailings, Triaxial tests, Steady-state properties, Steady-state line, Steady-state internal friction angle
