| The thickness and dip Angle of coal seam are important parameters to determine the mining method and technology in open-pit mining.The open-pit mine of huge thick inclined coal seam is an important object of open-pit mining,which is difficult to be mined due to the long exposure time of coal seam and slow release of inner drainage space.This article in view of the thick,tilt,including structural plane under the complex geological conditions,such as the slope aging characteristics and space-time evolution characteristics,the integrated use of rock mechanics,open-pit mining,such as fracture mechanics theory,the thick coal seam side help area,exposure time,exposure slope geometry structure and stress field evolution,the thick coal seam in open-pit mine features and conditions,The progressive failure law of slope under the influence of structural planes and the controlled mining of huge thick inclined coal seam over structural planes are studied.The main research work is as follows:(1)According to the geometric structure characteristics of the slope at the end of an open-pit mine with huge thick inclined coal seam,the function model between the thickness of the coal seam and the exposed area and exposed time is established,the aging characteristics of the open-pit slope with huge thick inclined coal seam are revealed,and the functional relationship between the exposure time and the advancing speed of the stope and the inner dump is established.(2)according to the open-air coal mining process,the drop period and by mining in open-pit mine excavation side slope structure and mechanical properties during the process of analysis,established a huge thick seam open-pit coal mine side slope in numerical calculation model,establishes the conditions of different thickness of coal seam bottom slope structure,stress and stability of the evolution.(3)According to the geometric structure characteristics of the open-pit mine with huge thick inclined coal seam,the self-locking and unlocking criterion of different soil strip and coal seam floor,and the slip and instability criterion between strips are proposed,and the optimization scheme of the aging characteristics of the open-pit slope in the dump structure and stability is determined.(4)Based on the limit equilibrium method of slope,the calculation theory of anti-sliding force and sliding force in the process of progressive failure of broken line sliding surface of slope with structural plane/crack is established by using slope geometric relations,and the progressive failure process and the change rule of aging stability coefficient of broken line sliding surface are revealed.The stress field at the tip of slope with structural plane is analyzed by using fracture theory,and the characteristics and distribution of stress field and displacement field near the slope with structural plane with fracture are obtained.(5)According to the geometry and parameter characteristics of different structural planes of huge thick inclined coal seam,the influence rule of structural plane position and parameter on the structure and stability of the huge thick inclined coal seam open-pit pit is revealed,the internal drainage parameters of the huge thick inclined coal seam open-pit mine are optimized,and the mining method of controlling the mining by the slope mining through structural structural plane is proposed.There are 126 figures,6 tables and 161 references in this paper. |
