摘要
煤炭是我国的主体能源,在国家的经济发展与社会稳定中起到了极其重要的作用,以前生产过程中遗留的煤炭采空区是目前需要研究的重要问题。本文首先简要介绍了我国煤炭资源的发展现状,接着从煤层被采空前后力学变化特征的角度分析了煤层不同开采程度下力学性质的变化,并结合煤矿生产经验给出了煤层不同开采程度下的采空区填充属性,为煤炭采空区电性特征的定性分析打下了基础。然后,对煤炭采空区的电性特征进行了定性分析,总结出5种煤炭采空区的电性特征,即1)电性层横向不再连续,出现局部低阻和高阻异常;2)煤层对应的低阻区域呈现出纵向扩展的趋势;3)煤层与围岩电性界面紊乱;4)低阻区向上延伸形成纵向低阻带;5)电性层不再具有层状特征,电性层序与正常地层层序不再对应)。最后,利用郴州市鲁塘煤(石墨)矿区采空区的实例,说明本文煤炭采空区电性特征的定性分析是合理的。
Coal remains the main source of energy in China. It plays a very important role in the economic development and social stability of the country. At present, the mined - out areas produced during previous production are one of the serious issues to study urgently. Firstly, this paper briefly introduces the present situation of the development of coal resources in China. Then from mechanical change characteristics of coal seams before and after mining, this paper makes an analysis the changes of mechanical properties of coal seams under different mining degrees and filling properties of mined - out areas, which permits the qualitative analysis of electric characteristics of the coal mining areas. Then, resistivity characteristics of the coal mining are- as are analyzed qualitatively, and 5 kinds of such features are summarized as follows. 1 ） The electric layers are no longer continuous laterally, and the lo- cal low - and high - resistivity anomalies are present. 2） The low resistance region presents a trend of vertical expansion. 3 ） Electrical interfaces are dis- ordered between coal seams and surrounding rocks. 4） The low resistance regions extend upward and form a longitudinal low - resistance zone. 5） The e- lectrical layer dose not have the layered characteristic, and the electrical sequence is no longer corresponding to the normal stratigraphic sequence. Final- ly, a case study of mined - out areas in the Lutang, Chenzhou coal （graphite） mining area demonstrates that the qualitative analysis of electric character- istics of mined - out areas in this paper is reasonable.
出处
《地质与勘探》
CAS
CSCD
北大核心
2016年第6期1147-1151,共5页
Geology and Exploration
关键词
临空面
采空区
电性差异
电性特征
定性分析
free surface, mined - out area, resistivity difference, electric characteristics, qualitative analysis
