Research On The Effect Of Water And Temperature On Creep Mechanical Properties Of Soft Rocks In Deep Mine

The creep property of deep soft rock is significant under the environment of groundwater and temperature coupling, which results in serious deformation and failure. It’s of great significance for keeping the stability of surrounding rock for soft rock roadways under the deep complex geological mechanics environment. Based on the physical test, the theoretical analysis and the numerical simulation, the creep mechanical properties and creep model of deep soft rock considering the effect of water and temperature was studied. The main research results was summarized as follows:(1) The uniaxial compression test and acoustic emission test to deep soft rock under the action of water and temperature was carried out and the compressive strength, elastic modulus and failure mode of the soft rock under the action of different moisture content and temperature was analysed. Which showed the effect law of water and temperature on basic mechanical properties of soft rock.(2) Independently developed a set of constant temperature and humidityCantilever lever creep test system. Conducted uniaxial grading load creep test of deep soft rock under the effect of water and temperature. Systematic studied soft rock creep deformation, creep rate variation under different moisture and temperature. Revealed the influence of water and temperature effect on the mechanical properties of soft rock.(3) Based soft rock creep test results, set up a way to represent the whole process of soft rock creep nonlinear creep model. Deduced soft rock creep constitutive equation, and by using the nonlinear regression analysis method to identify the parameters of the model. Then obtained the variation of soft rock creep parameters with stress, temperature and water.(4) By use of soft rock creep model established, Numerical simulation of soft rock uniaxial compression creep under the effect of water and temperature was conducted. The simulation results and the experimental results are in good agreement, which proved the correctness of the model. Taking a deep soft rock engineering geological conditions for the background, deep soft rock deformation and failure considering the effect of water and temperature was simulated. Revealed the aging deformation and failure mechanism of soft rock in deep under the effect of water and temperature.