Study Of Deep Mudstone On The Physical And Mechanical Properties In High Temperature Environment

Based on the deep coal mine symbiotic mudstone as the research object, through making can in mechanical properties, the structure of the components of height fitting goal of mudstone and mudstone-cement mixture specimens simulated replace, uneven structure, tectonic and changeable mudstone experiment in different temperature of specimen under the condition of uniaxial compression experiments at the same time combined with the corresponding view of mudstone imperceptible development change, comprehensive analysis to explore the temperature on the deep roadway coal shale physical and mechanical properties, micro view change characteristics and high temperature mode failure pattern, important conclusions are obtained.The main research results and conclusions are listed as follows:(1) Through the adoption of RMT-150B rock mechanics test system and GD-65/150-high and low temperature environment box on the specimen at 25℃～60℃ temperature order axial compression get mudstone of the stress-strain curve, peak stress, peak strain, elastic modulus, deformation modulus and other important parameters; Mudstone under different temperature under uniaxial compression stress-strain entire process curve forms basic, have high similarity, pressure curve can be divided into general, elasticity, yield, and destroy the four stages. However, with the increase of temperature, the peak stress, peak strain of the specimen decreases, it is characterized by the peaks of the curve moves to the lower left corner. With increasing temperature, mixture specimen peak stress, peak strain and elastic modulus decreases, and peak strain increase.(2) Developed by hohai university institute of geotechnical engineering rock and soil microstructure optical test system of target mudstone specimens of different sections under different temperature took photos of microstructure of temperature under the action of particle area ratio, particle size distribution fractal dimension, particle roundness and change laws of pore orientation degree. Mudstone specimens heated destroy microscopic experiment results with mudstone uniaxial compression experiment results have consistency, with the increase of temperature, mudstone particle area ratio, particle roundness decreases, and pore area ratio and pore roundness increases accordingly, microscopic changes in the mudstone appeared on the macro micro cracks mudstone specimens increases unceasingly, specimen damage mechanics characteristics, uniaxial compressive strength is on the decline.(3) Combined with mixed specimen mechanics parameters, formation law of sandstrom, micro view fracture mudstone high temperatures by using rock damage theory and mathematical statistics knowledge, set up effective the mudstone damage constitutive model considering temperature effect, promote the changes in the nature of mudstone and the deeper exploration and understanding...