Study On The Rheological Constitutive Model Of The Rock Slurry Prepared In Laboratory

The study of rheological mechanical properties and constitutive model of rock slurry has important reference value for the analysis of long term rheological behavior and deformation of surrounding rock. This paper to Huaibei Qinan Coal Mine 34 mining area of mudstone roof as the object of study, from the scene has broken rock, laboratory prepared different lithology, fracture degree different, size composition, different rock slurry standard specimen, using test research, theoretical research and numerical verification methods, of rock slurry mechanical properties and creep law for analysis and research.Based on the rock slurry specimens of the basic mechanical properties test and the three axle loading creep test, the compressive strength of different specimen and different relationship between the creep curves of strain level and time; creep law of rock slurry based on rheological model was established and applied to rock slurry, a a time related describe the accelerated creep stage of nonlinear visco elastoplastic element and linear element Burgers model are deduced according to the model of the structure of the three-dimensional constitutive equations of it; the combination of the linear decreasing weight PSO algorithm and nonlinear least squares method to identify the parameters of the rheological model, the related degree of fitting very high; verified the accuracy of selected rock slurry creep model is reasonable and the parameter identification by using FLAC3D software; the roadway surrounding engineering practice Push model structure is derived. According to the basic rheological mechanics method, push derive creep grouting of roadway surrounding rock displacement and deformation rate formula, combined with creep model parameters identification results predict the dynamic process of the variations of displacement of surrounding rock, for roadway support to provide more reliable basis, and combined with the field of surrounding rock deformation data to validate the model correctness.