Study Of Control Mechanism Of Tectonic Settings On Environment Hazards Related To Coal-mining

Aiming for a decrease in destruction of geological environment induced by coal mining, a theoretical compendium of "tectonic control of hazard" is founded in this thesis, with the empirical relation between environment hazards related to coal-mining and various influence factors, as well as the concept and assessment index system of bearing capacity of geological environment of coal mining areas based on the research of the control mechanism of structural medium, fractures and tectonic stress over ground environment hazards by means of theoretic analysis of structural geology and mechanics, similar material simulation and digital test in allusion to concrete conditions of geological and underground mining in typical coal mining areas.The overburden of coal seam is a kind of structural rock body with "structure memory" and the structural medium of environment hazards related to coal mining that is a type of special ground tectonic deformation. Fractures are the geological discontinuity surfaces within strata resulted from tectonic movements during geological time and represent the most distinct reconstruction of the overburden by tectonic movements. Compression and tension are the most essential tectonic stress states in coal areas. They can change the direction and distance of rock body displacement induced by underground mining; also they affect the deformation pattern of workings. The tectonic setting of underground mining engineering is constituted by structural medium, fractures and tectonic stress in influence, restriction and cooperation one another. Ground environment hazards in coal-mining areas are induced by underground mining, but the formation and development of the hazards are controlled by the internal configuration and characteristics of tectonic settings, therefore it is necessary to consider theinfluence of tectonic setting, especially the tectonic stress in studying ground environment hazards related to coal-mining.Owing to the difference of tectonic settings the bearing capacities of geological environment are disparate in various coal-mining areas. The traditional idea and action should be changed in coal production. The bearing capacity of geological environment under certain tectonic settings can be assessed according to the anti-jamming capacity of geological environment itself, the exploitation intensity of underground coal resource and the natural ecological conditions in concrete coal mining area. The damage degree of ground environment induced by coal mining can be predicted prior to mining using the forecast formula educed in this thesis. The damage of ground environment should be limited to the acceptable degree based on the bearing capacity of geological environment by restricting coal mining.