压实强度对煤矸石山覆盖材料空气阻隔性的影响  

Compaction Strength Affected to Air Barrier Property of Covering Materials on Coal Rejects Dumping Pile

作　　者：陈胜华[1] 郭陶明[1] 胡振琪[2] 张勇[3] 邢超 高杨[2] 

机构地区：[1]太原理工大学阳泉学院,山西阳泉045000 [2]中国矿业大学(北京)土地复垦与生态重建研究所,北京100083 [3]山西阳泉煤业(集团)有限责任公司技术中心环保研究所,山西阳泉045000

出　　处：《煤炭科学技术》2013年第11期116-119,共4页Coal Science and Technology

基　　金：山西省自然科学基金资助项目(2011011030);国家自然科学基金资助项目(50874112)

摘　　要：为研究煤矸石山构建覆盖层过程中相关的碾压方法及参数，结合阳泉三矿煤矸石山治理现场条件，以粉土及粉煤灰作为试验材料，通过室内模拟测试土样在不同压实强度作用下的空气阻隔性，分析压实强度对材料阻燃效果的影响及规律，探讨自燃煤矸石山综合治理中碾压强度对覆盖层阻隔功能产生的效应，给出最优的碾压强度。结果表明：压实强度影响材料的空气渗透速度，二者之间呈负指数函数关系；随压实强度增加，材料的空气阻隔性逐渐增大，单位体积压实功从50kJ／m3增加到300kJ／m3时，平均渗透率从1．22×10^13m2降到2．17×10-15m2；不同压差下空气渗透速度随单位体积压实功变化的曲线有一个特征点，压差为2～10kPa时，最有效的单位体积压实功在100～150kJ／m3。In order to study the related roiling compaction method and parameters in the covering layer building process of the coal rejects dumping pile,in combination with the site conditions of the coal rejects dumping pile control in Yangyquan No.3 Mine, based on the pow- der soil and fly ash applied as the test material, an indoor simulation was applied to measure and test the air barrier property of the samples under the different compaction strengths.The paper analyzed the compaction strength affected to the fire resistance effect of the material and discussed the rolling strength in the comprehensive control of the spontaneous combusted coal rejects dumping pile affected to the barrier function effect of the covering layer.An optimal rolling strength was provided.The results showed that the compaction strength would affect the air seepage velocity of the material and there was a negative index function relationship between the compaction strength and the mate- rial.With the compaction strength increased, the air barrier property of the material would be steadily increased.When the compaction power per unit volume was increased from 50 kJ/m3 to 300 kJ/m3 ,the average permeability would be reduced from 1.22×10-13 m2 to 2.17×10^15 m2. Under the different pressure difference, there was a characteristic point in the curve of the permeability velocity varied with the compaction function.When the pressure difference was 2-10 kPa,the most effective compaction power of the unit volume was 100 - 150 kJ/m3.

关 键 词：自燃煤矸石山 压实强度 空气阻隔性 空气渗透速度 

分 类 号：X752[环境科学与工程—环境工程]