Study On Influence Of Faults On Mining Stress Distribution Of1604Gongwusu Coal Caving Face

It is an important geological faults affecting coal mine production safety, which is particularly common small faults. Stress distribution near the fault are very different, excavation disturbance will cause the fault displacement field around the plastic zone and the stress field redistribution. Especially in big dip thick seam mining process destroys the continuity and integrity of the fault seams, and then due to the nearby faults by the mining stress perturbations caused by fault reactivation off thereby causing broken seam roof and floor, severely restricting the safe and efficient mine mining.Given Gongwusu1604fully mechanized caving mining face complex geological conditions, such as coal seam thickness, face angle large, face length and other characteristics, the paper after extensive collection of information and on-site research, theoretical analysis, numerical simulation and engineering practice a combination of methods to analyze fully mechanized caving face stress distribution in case of fault characteristics, the analysis of1604Gongwusu coal face stress distribution in case of fault characteristics and fragmentation studies with control.(1) By the16th Gongwusu coal seam coal and rock sampling, coal and rock mechanical properties, such as tests, the rock mechanical parameters, reflecting the16th direct coal large fine sandstone roof strength, the elastic deformation and brittle fracture characteristics very obvious;(2) Fault-related concepts and categories do a simple introduction. Use fault stress field near the distribution theory, to use physical mechanics and physics of rock fracture mechanics description of the mechanism of fault. Under both important factors affecting faults, one by one on the structural characteristics of faults and fault fracture zone associated with the formation mechanism of doing analysis, stress analysis before and after the formation of the theoretical value estimate normal faults and mechanical properties of the fault occurrence and do the research. (3) The use of numerical simulation software FLAC3D obtained in1604the structure of the roof and floor conditions face mining process model to identify a large angle thick Coal Seam Mining generated in the process of fault structure analysis by model results impact of laws and characteristics of near fault fracture zone control provide a theoretical basis.(4) Research tomography method too: According to the special geological conditions Gongwusu coal caving face in1604, through the design and implementation of the adjustment Oblique forcibly cut partings, put the gun through the technical process F3shock normal faults. Meanwhile fracture zone control: Through the face with Remy advanced pre-grouting grouting material support, to prevent, control roof fall, Coal Wall purposes.When1604when the actual face F3fault, and promote the normal speed of1.8m/d, and within the expected time passed the scope of the impact of faults. During through faults, in addition to coal, the other basic production was not affected.