煤矸石击实特性试验

发布时间：2018-07-03 20:07

本文选题：煤矸石 + 击实试验　；参考：《地质科技情报》2017年03期

【摘要】：天然煤矸石级配极不均匀,多变量控制下的击实特性试验研究对其合理利用有着重要意义。以广西合山市某煤矸石堆为例,现场筛分得到该煤矸石堆天然矸石级配曲线,并设计了5种人工级配试验样进行击实试验,得到不同级配煤矸石的最佳含水率和最大干密度。测试了不同击实数(不同击实能量)作用下煤矸石的破碎值及休止角等指标参数。研究表明:煤矸石击实性受含水率、颗粒级配和击实能量等因素影响,大于5mm的粗颗粒质量分数(P_5)为70%时击实效果最佳;随着粗颗粒含量的增加,击实最优含水率由P_5=10%的8%降低为P_5=70%的4%;煤矸石击实过程可以简化为3个阶段:初期的颗粒间压密、中期的颗粒破碎和后期的弹性回弹,击实破碎可以有效地改善其散体的级配条件,在填筑工程施工过程中,应确保单位体积击实能量不小于437kJ/m3;煤矸石休止角与颗粒级配及击实程度关系密切,P_5=70%时煤矸石休止角最大。
[Abstract]:Due to the uneven gradation of natural coal gangue, the experimental study on compaction characteristics under multivariable control is of great significance to its rational utilization. Taking a coal gangue pile in Heshan, Guangxi as an example, the natural gangue gradation curve of the coal gangue pile was obtained by field screening. Five artificial gradation test samples were designed for compaction test, and the optimum moisture content and maximum dry density of different gradation coal gangue were obtained. The breakage value and the angle of repose of coal gangue under the action of different compaction number (different compaction energy) were measured. The results show that the compaction property of coal gangue is affected by water content, particle gradation and compaction energy, and the compaction effect is the best when the mass fraction of coarse particle (P _ 5) greater than 5mm is 70, and with the increase of coarse particle content, The optimum moisture content of compaction is reduced from 8% of P510% to 4% of P570%; the compaction process of coal gangue can be simplified into three stages: the initial compaction between particles, the breaking of particles in the middle, and the elastic springback at the later stage. Compaction and crushing can effectively improve the gradation condition of its bulk. During the construction of filling engineering, the compaction energy per unit volume should be ensured not less than 437kJ / m3, and the angle of repose of coal gangue is closely related to particle gradation and compaction degree.
【作者单位】：中国地质大学(武汉)工程学院;中国地质大学(武汉)环境学院;
【基金】：国家自然科学基金项目(41572256) 国家矿山地质环境治理专项重点工程项目(合山市矿山地质环境治理) 中央高校基本科研业务费专项资金资助项目
【分类号】：U416.1

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