云南某铜矿尾矿物理力学特性及尾矿库稳定性评价

Physical and mechanical properties and stability evaluation of a tailings reservoir in Yunnan Province

中文关键词: 尾矿库  物理力学特性  稳定性评价  三轴剪切  浸水固结快剪

英文关键词: tailings reservoir  physical and mechanical property  stability appraisal  triaxial shear  water immersion consolidation quick shear

中文摘要:

      随着矿业的快速发展和资源需求的增加，尾矿库的稳定性及扩容成为了保证矿业可持续发展和环境安全的关键问题，本文以香格里拉市某铜矿尾矿库为研究对象，对库区现状稳定性进行评价及扩容后的适应性进行分析。通过野外踏勘、现场取样及室内土工试验、模拟计算等手段，查明区内地形地貌、地层岩性、水文地质条件和地质构造，分析不同岩土层的物理力学参数，计算现状和尾矿库扩容后不同工况下的稳定性，结果表明:(1)地下水位以上尾粉砂层的黏聚力较地下水位以下的黏聚力偏小，地下水位以上尾粉砂层的内摩擦角较地下水位以下的内摩擦角偏大；(2)地下水位以上尾粉土层的黏聚力较地下水位以下的黏聚力偏小，内摩擦角接近；(3)现状尾矿库库底和库岸及坝体均处于稳定状态，经计算各工况下的坝坡稳定性计算值均满足规范要求；(4)根据拟实施对尾矿库扩容方案，在采用三轴剪切和浸水固结快剪参数的条件下，计算结果表明尾矿库均处于稳定状态，尾矿库适宜扩容。本研究的成功实践为其他尾矿库的稳定性评估和扩容提供了重要的参考和借鉴。

英文摘要:

      With the rapid development of the mining industry and the increasing demand for resources, the sta-bility and expansion of the tailings reservoir have become the key issues to ensure the sustainable development ofthe mining industry and environmental safety. This paper takes the tailings reservoir of Xuejiping Copper Mine asthe research object, evaluates the current stability of the reservoir area and analyzes its adaptability after expansion.By means of field survey, field sampling, indoor soil test and simulation calculation, the terrain and geomorphology,formation lithology, hydrogeological conditions and geological structure in the area were ascertained, the physicaland mechanical parameters of different rock and soil layers were analyzed, and the status quo and stability of thetailings pond under different working conditions after expansion were calculated. The results showed that: (1) Thecohesion above the water table of the tail silt layer is smaller than that below the water table, and the internal fric-tion Angle above the water table is larger than that below the water table; (2) The cohesion above the groundwaterlevel of the tail silt layer is smaller than that below the groundwater level, and the internal friction Angle is close. (3)The bottom and bank of the tailings pond and the dam body are in a stable state, and the calculated stability valuesof the dam slope under each working condition meet the requirements of the code; (4) According to the proposed ex-pansion plan for the tailings pond, under the fast shear parameters of triaxial shear and immersion consolidation, thetailings pond is in a stable state and the expansion of the tailings pond is suitable. The successful practice of thisstudy provides an important reference for the stability assessment and expansion of other tailings reservoirs.