The deformation properties of mudstone and numerical calculation based on unloading path
LI Dong-wei
WANG Ren-he
FAN Ju-hong
Abstract：The stress state in coalmine mudstone roadway excavation process was simulated by the triaxial shear test through the method of first consolidation then radial unloading. The radial unloading conditions of the test in the confining pressure can use the Drucker-Prager strength criterion, it can well describe the soft-rock failure process. The creep test results show that the creep rate reduce obviously with the deviatoric stress level decrease, the axial creep unchanged when the deviatoric stress level is lower(1.0 MPa) ,the creep rate is almost zero;the mudstone creep process goes through deceleration, steady and acceleration these three stages when the axial stress is higher (3.5 MPa). The elasto-viscoplastic rheological constitutive model of mudstone was proposed based on the test. Compared the test results and the calculated value ,it shows that their deformation laws are complete consistency and their values are more anastomosis, thus the correctness of the constitutive model of mudstone is verified.
Keywords：unloadingsoft-rock roadwaytriaxial shear testcreepthe constitutive model of mudstone
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( 387-391 )