The aggregate used in the roller compacted concrete at Gongguoqiao hydropower station was the excavated material from underground caverns which relied on sandstone and slate.

Based on the analysis of rock group structure,geology force,the VF electricity grasps method in sandstone under coal seam bottom in 6123 working-face,discussed 12 mining area coal seam bottom sandstone,and bring forward the measure of preventing,according to having an effect to guide safety at work for coal seam bottom water burst.

Research on the heating activation mechanism of viscoelastic relaxation in fluid-saturated sandstone;

Fluid effect of attenuation, modulus and velocity in saturated sandstone;

Low-frequency covibration experiments of four kinds of fluid-saturated feldspar sandstones which have different viscosity coefficients respectively were conducted so as to know how fluid viscosity coefficient influences attenuation, modulus and velocity dispersion in fluid-saturated sandstone.