Study On The Characteristics Of Compression Of The Gangue Used In Backfilling The Tunnel

Large scale and high strength coal mining can meet the national economy development needs.At the same time, that also leads to serious environment question and social question.The roots of the problem is the open.air emissions of gangue and the sedimentation of goaf. In order to solve the serious problem which resulted by coal mining, we should pay more attention to the green mining technology. The core of that technology is the backfill mining with gangue.The research background of this paper is the coal mining by filling the gangue into the tunnel at Xiaonan Coal Mine of Tiefa Caol Mining Company Limited. Screen grade testing which can distinguish the gangue of different grade has been done in the laboratory with the self-made strainer. According to soil mechanics and experiment theory of mechanic, gangue compression test is designed. By Origin, the specialized function graphics software, features are researched and analyzde systematically about the compression curve, lateral stress curve and strain-streess curve of filling gangue in the different gradation conditions. The relationship formulas of those curves are concluded by regression analysis.At the same time, the rules of the parameter in the relationship formulas are also concluded.On the base of the theories on ground surface settlement, Elastic mechanics and The mechanics of materials, mechanical model about roof movement is found in order to analyze the rule of that and get the prognostic formulas of that. At last, numerical simulation on rock movement is made with FLAC3D and Surfer in different mining conditions (without filling and filling with different gradation gangue) in order to find the regularity about the movement of overburden and the ground surface. By means of numerical simulation, we can get the conclusion that the backfill mining with gangue in tunnel can effectively control the rock movement.