高寒地区废石破碎胶结充填体强度特性试验研究与工业应用

EXPERIMENTAL STUDY OF STRENGTH OF BACKFILLINGS OF CEMENTED ROCK DEBRIS AND ITS APPLICATION UNDER LOW TEMPERATURE CONDITION

胶结充填技术逐渐应用于低温高寒资源开发中,同时会产生充填体强度过低、塌方、冒落等一系列难题。以某金矿寒区开采为背景,通过试验对比,综合研究养护温度、水泥掺入量及料浆浓度对充填体性能的影响。在实现自流输送前提下,确定合理的废石破碎胶结充填配合比及养护温度。结果表明:与铁矿尾砂充填相比,采用废石破碎胶结充填具有明显优势,料浆浓度可以达到75%;低温阻碍了水泥水化反应的进行,养护温度越高,单轴抗压强度越大,提高养护温度有利于充填体强度的提升;养护温度对充填体早期强度影响较大,后期相对较小。提出废石破碎胶结充填拌合水预加热方案,并进行现场工业试验,为寒区矿山废石充填提供理论基础和技术参考。

Cemented backfilling technology has been increasingly used in the exploitation of mineral resources under the low temperature condition,but it has also brought about a series of difficult issues,such as the problem of poor strength of backfilling materials,the collapse and the failing. The effects of the curing temperature,the cement content and the slurry concentration on the strength of backfilling materials were thus studied experimentally to tackle the problems faced in a gold mine at cold region. The rational proportions of mixed material contents and the curing temperature of paste of cement-rock debris mixture were determined to meet the requirement of gravitational transportation. The experimental results revealed that the cemented rock debris was better than the iron ore tailings as the backfilling material and its slurry concentration reached to 75%. The low temperature was found to hinder the hydration. The higher the curing temperature was,the higher the uniaxial compressive strength (UCS). The increasing of curing temperature improved the strength of backfilling material. The curing temperature influenced more on the early strength but little on the later strength of backfilling material. The heated water for rock debris mixing and cementation was therefore proposed and applied successfully in an industrial experiment.