The coal seam water-rich problem in the Jurassic coalfield in northern Shaanxi is special,which seriously af-fects the safety production of the mine.In this study,the weakly cemented sandstone of Balasu coal mine is taken as the research object,and the uniaxial compression test of weakly cemented rock under different water content and saturation time is carried out to study the influence of water content and saturation time on the mechanical properties and compres-sion failure energy evolution of weakly cemented sandstone.The study found that:the damage degree caused by the in-crease of water content to the internal structure of the rock is much greater than that caused by the increase of water satu-ration time.When the water content of the sandstone specimen ranges from 0 to 100％,its compressive strength and elas-tic modulus decrease by 8.54 MPa and 1.13 GPa,respectively.When the water content of the specimen ranges from 3 days to 23 days,the compressive strength and elastic modulus decrease by only 1.04 MPa and 0.12 GPa,respectively.Each intensity index basically no longer changes.Based on the results of energy analysis,with the increase of water con-tent,the energy impact index ACF,maximum storage elastic strain energy index Es and residual energy index of sandstone specimens WR decreased by 1.69,0.055 MJ/m3 and 1.1,respectively,and the rock burst tendency of the specimens de-creased.The research results can provide reference for excavation and disaster prevention and control of large-section wa-ter-rich coal mines.
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