Experimental study on deformation characteristics of composite structure for underground gas storage in abandoned roadways
Geo-mechanical model testing is a common method for geo-technical engineering problems,and appropriate similar materials and ratios are the key to the success of model testing.To explore the feasibility and application effect of compressed air energy storage in soft rock roadways of abandoned coal mines,based on the similarity theory and the orthogonal experimental method,a similar material that can meet the requirements for porosity,elastic modulus and strength was obtained through a large number of indoor experiments by using cement and gypsum as the bonding materials and sand as the ag-gregate.The sensitivities of various factors(sand particle size,gypsum-sand ratio,ash-sand ratio,and water-sand ratio)to the physical and mechanical parameters of the prepared similar material were ana-lyzed.Subsequently,this optimized material was applied in the development and test of a physical model for compressed air energy storage in roadways of abandoned coal mines.At last,inflation and deflation tests were conducted on the composite structure of gas storage surrounding rock-lining under different working conditions(cycle number,gas pressure,and geostress).The research results indicate that the experimentally acquired physical and mechanical parameters of the similar material vary greatly,which can meet the physical model test requirements for compressed air energy storage in soft rock roadways.The ash-sand ratio plays a major role in affecting the uniaxial compressive strength,tensile strength,e-lastic modulus,Poisson's ratio,internal friction angle,and cohesion of the similar material,while the ash-sand ratio and the gypsum-sand ratio mainly control its density and porosity.The established physical model can effectively simulate the deformation law of the surrounding rock-lining composite structure during gas storage,providing reference for the study on compressed air energy storage in soft rock road-ways of abandoned coal mines.
abandoned minesoft rockcompressed air energy storagesimilar materialmodel test
万方数据
维普
