Creep Constitutive Model and Numerical Realization of Coal-Rock Combination Deteriorated by Immersion

Coal-rock combination refers to the coal and rock as a whole, failure of whole structure is main cause for instability deep underground engineering. In engineering, coal-rock usually under certain hydrogeological conditions, it prone seepage rheological accidents due long-term action water stress. this study, creep constitutive model considering influence moisture content was established based on Burgers model. According experimental results triaxial rock, relationship between parameter derived, correctness in study verified. Then, through C++ language, core equation modified, numerical calculation realized by introducing into FLAC3D simulation software. Finally, used simulate characteristics with different contents loading. The showed that stress environment have significant effects combination. Under same state, increased content, strain rate exhibited non-linear rapid increase constant-velocity stage, limit deformation instantaneous elastic increased, viscosity coefficient significantly decreased. For example, when axial 5 MPa from 0% 1.5%, 44.06%, 20%, 10.53%, decreased about 50%. When 0%, 14 MPa, nearly four times. With value will further expand. research conclusions can provide reference basis stability control surrounding engineering affected water.