陕西省彬长矿区主采煤层煤岩力学特征

Mechanical characteristics of coal and rock of main mineable seam in Binchang mining area

通过陕西黄陇侏罗纪煤田彬长矿区煤岩力学参数试验,通过收集、整理彬长矿区各矿地质勘探资料对比分析,研究该矿区主采煤层的煤岩力学性质及其影响因素。研究表明,研究区主采煤层的抗压强度与泊松比呈正相关;弹性模量与泊松比呈负相关。同时发现研究区主采煤层的抗压强度随着镜质组含量的增大而减小,随着惰质组的含量增大而增大;弹性模量随着惰质组含量的增大而减小,随着无机物含量的增大而减小;泊松比随着镜质组含量的增大而减小,随着惰质组含量的增大而增大;抗压强度和泊松比随着煤层埋深的增大而减小。研究发现,煤层具有低强度、低弹性模量、高泊松比的特性,更易形成短宽裂缝,进而对煤层气赋存的有利区块进行预测。

Through the test of coal and rock mechanical parameters in Binchang mining area of Huanglong Jurassic coalfield,Shaanxi Province,combined with the collection and sorting of geological exploration data of various coal mines in Binchang mining area,comparative analysis is carried out,and the coal and rock mechanical properties and influencing factors of the main mineable coal seams in the mining area are researched.The research shows that the compressive strength of the main mineable coal seams in the research area is positively correlated with Poisson’s ratio,and the elastic modulus is negatively correlated with Poisson’s ratio.At the same time,it is found that the compressive strength of the main mineable coal seams in the research area decreases with the increase of vitrinite content and increases with the increase of inertinite content;the elastic modulus decreases with the increase of inertinite content and inorganic content;Poisson’s ratio decreases with the increase of vitrinite content and increases with the increase of inertinite content;the compressive strength and Poisson’s ratio decrease with the increase of coal seam buried depth.It is found that the coal seam has the characteristics of low strength,low elastic modulus and high Poisson’s ratio,and it is easier to form short and wide fractures.Finally,the favorable blocks for coalbed methane occurrence are predicted.