基于地质强度因子的煤体结构精细描述

Fine Description of Coal Structure Based on Geological Strength Index

煤体结构的精细描述是煤层气开发和瓦斯治理工艺选择的基础。引入岩体力学中的地质强度因子(GSI),对煤体结构进行了更加精细的描述。通过对河南省部分矿区各类煤体GSI的确定,发现以往划分的原生结构煤→碎裂煤→碎粒煤→糜棱煤之间很难有明显的界限,煤体变形是一个渐变过程,采用GSI可定量表达这一渐变过程。GSI的引入为今后利用Hoek-Brown破裂准则对不同煤体结构的煤岩体变形模量估算和更为准确地预测煤储层渗透率奠定了基础。

Fine description of coal structure is the basis of the process section of coalbed methane development and the gas governance. The geological strength index （GSI） of rock mechanics was introduced to a more fine description of coal structure in this paper. By determining GSI of various types of coal in some mining areas in Henan Province ,it was proposed that the clear boundaries among the pri- mary structure coal, fragment coal, flax seed coal and mylonitic coal which were divided in the past was difficult to find. Coal deformation is a gradual process,and the gradual process was quantitative expressed by GSI values. By the introduction of GSI,the basis of coal and rock mass deformation modulus of different coal structure is estimated future by the Hoek-Brown fracture criterion and the coal permeability is estimated more accurately is established.