Rheological Mechanical Properties And Model Research Of Gneiss

With the reducing of shallow mineral resources, in recent years the mine continued to deep mining, mine workings as an important mine structure, rheological and mechanical properties of rock directly affect whether you can mine production safety. At the same time. many rock engineering failure or sabotage, the destruction and instability of slope are related to the rheological deformation of the rock, Large rock project feasibility study is required to study the rheological properties of rock. Increasing the depth of underground works, rock stability under high stress has become a pressing issue to discuss.Based on the timeliness of stable long-term hard rock theme, this paper mainly studies based on the Hongtoushan Copper Mine of 27 stope wall rock in the gneiss, From the study of deep hard rock rheological test、 established rheological constitutive model、Identification of model parameters and Inversion model parameters, etc. to deep research Rheological mechanical properties of hard rock。 Overall, the article research content for the following:(1) Through the Mountain Copper Mine in the Red 27 take gneiss rock, making into standard samples. Conventional three axis test based on the analysis of variation, gneiss test compressive strength, deformation modulus and Poisson ratio and sample characteristics, strength characteristics and damage law, the basic mechanical parameters of rock specimen obtained.(2) Hongtoushan Copper Mine 27 coal gneiss as the research object, using the incremental loading method, for rock rheological test. According to the creep test curve and data, analysis of the variation of gneiss axial deformation, lateral deformation, creep rate, as for the establishment of the gneiss constitutive model and provide a reliable basis for.(3) According to the analysis of rheological model of rock rheological test curve, the stress threshold based on the attempt to establish a suitable to describe the rheological characteristics of hard rock nonlinear Composite rheological model, using the method of least squares on the basis of the model equation of creep curve was fitting.(4) All levels of classification. Experimental curve and the theoretical curve fit, rheological properties and the model can better reflect the hard rock of the three stages of the. It shows that this model can reasonably describe the Hongtoushan Copper Mine 27 coal creep characteristics of deep rock.