Quantitative discrimination of critical depth in deep exploitation in Fushun coalfield
LI Tie
CAI Mei-feng
JI Hong-guang
Abstract：Took Fushun coalfield for the engineering background,it was found that the critical depth in deep exploitation was the mining-disturbed rock mass dynamic response from the linear to nonlinear through the on-site and analysis of micro fracture of rocks and gas.A method was proposed to judge quantitatively the mechanical behavior of the mining-disturbed rock mass with the apparent constitutive relation of rocks and the characteristics of micro fractal geometry of rocks brittle fracture.as well as special dynamic phenomenon that does not happen at shallow.The results show that from above three indexes,the depth of 700 m around is the critical depth that the nonlinear dynamic response happens for the mechanics behavior of the mining-disturbed rock mass in the coalfield.
Keywords：deep exploitationnonlinear critical depthmethods of quantitative discriminationrock mass dynamic responseapparent constitutive relation
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 363-367 )