表生作用下煤矸石风化特征研究——以淮南矿区为例  

Weathering characteristics of coal gangue in hypergenesis:a case study on Huainan coal mining area

作　　者：蔡毅[1] 严家平[1] 陈孝杨[1] 徐良骥[2] 许正刚[3] 姚军[3] 

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]安徽理工大学测绘学院,安徽淮南232001 [3]淮南创大实业有限责任公司,安徽淮南232082

出　　处：《中国矿业大学学报》2015年第5期937-943,958,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51274013)

摘　　要：选取淮南矿区不同风化年限的煤矸石进行分层采样,通过对所采135份样品的粒组划分及保水性的定量测试,对比分析了表生作用下煤矸石块度分布特征及其保水性变化规律,为矿区煤矸石等充填复垦工程应用提供科学依据.结果表明：不同采样区和同一采样区不同暴露程度的煤矸石块度分布差别较大;所有采样区上层煤矸石小于2mm和2~10mm两个粒组质量百分比显著高于下层;随着风化年限的增加,各采样区煤矸石小于2mm粒组的质量百分比总体呈上升趋势;随着风化程度的增强,10~20mm和2~10mm块度及自然块度的煤矸石的保水性均逐渐提高,且同一采样区上层煤矸石保水性均高于下层,即表生作用下块度相同的煤矸石保水性的高低受其风化程度的影响;同一采样区10~20mm和2~10mm块度及自然块度煤矸石保水性依次增高,即煤矸石块度分布特征对其保水性具有显著影响,尤其小于2mm块度煤矸石对提高煤矸石的保水性至关重要,且二者存在良好的相关性.Via stratified sampling,135 samples were taken from the coal gangue which were selected by different weathering ages.Based on the particle group division and quantitative tests of water retention capacity of these coal gangue samples,the size distribution characteristics and water retaining capacity variation of coal gangue were studied,which could provide theoretical basis for engineering application and filling reclamation with coal gangue.The results show that the particle size distributions of the coal gangue from different sample areas or with different degrees of exposure are nonuniform.In upper layer,the mass percent of the coal gangue whose particle size is less than 2 mm or between 2and 10 mm is higher than that in lower layer.With the increasing weathering age,the mass percent of coal gangue less than2 mm is on the rise among sampling areas.With the enhancement of weathering intensity,the water retention capacity of natural graded coal gangue goes up,as well as the coal gangue taken from 10—20mm and 2—10mm groups;the water retention capacities of coal gangue in upper layer is higher indicating that in hypergenesis,the water retention capacity of coal gangue of same size is affected by weathering degree.In the same sampling area,water retention capacities of coal gangue taken from 10—20 mm,2—10 mm and natural graded groups increase in turn namely characteristics of coal gangue particle size distribution have significant influence on its water retention capacity,and the coal gangue whose size is less than 2mm is especially crucial to improve its water retention ability.There is a good correlation between the characteristics of particle size distribution and water retention capacity of coal gangue.

关 键 词：表生作用 煤矸石 风化 块度分布 保水性 

分 类 号：TD849.5[矿业工程—煤矿开采]