Effects of combination mode on mechanical properties and failure characteristics of the coal-rock combinations
Abstract：To discuss the effects of coal-rock combination mode on its mechanical and damaging characteristics,the uniaxial and triaxial compressive tests for three combination modes,such as Rock-Coal-Rock(YMY),Rock-Coal(YM) and Coal-Rock(MY),were carried out on MTS815 Rock Mechanics Testing System.The results show that the failure mainly concentrates on the coal part of combination specimen,and do not be affected by the combining mode and the loading condition.The development of damage and increase of failure extent in coal part can result in the emergence of damage and failure in rock part to some extent.The failure states are mainly tensile failure and happens in coal part for uniaxial compressive test.The uniaxial compressive strength of YMY is 40.03 MPa,which is 1.80 and 1.53 times of YM and MY,respectively.Under triaxial compressive condition,the failure are all mainly shear failure in coal part,and the average triaxial strength for three combination modes gradually approaches with the confining pressure increasing.
Keywords：combination modecoal-rock combinationmechanical propertyfailure characteristic
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1677-1681 )