Thick Coal Seam Broken Law Of Fully Mechanized Caving Mining Overburden

The laws on upper rock mass deformation, failure and water flowing fractured zone development are closely-related to production safety of coal mining under water body, and relevant researches on these are rare. Due to this fact, the demands of the research on upper rock mass failure is getting much more strong. Meanwhile, as the process of underground mining year by year, the goaf area has been expanded to north and endangered the safety of the massive number of industrial and civil constructions in Fushun city. Many constructions have deformed or been destroyed to a great degree. In the circumstance, the research on upper rock mass movement seems very necessary.The main research researching contents include:(1) with reference to the geological features and other influencing factors, such as rock mass strength, etc.3-D numerical stimulation method is utilized to research the laws of upper rock mass failure, stress distribution and development and under the condition of top caving of especially thick coal seam.(2) with reference to the field measured data, researching the laws of upper rock mass deformation and movement and the heights and the laws of development of water flowing fractured zone under the condition top caving of especially thick coal seam.(3) establishing the subsidence projection formulas on fuzzy mathematics.In order to achieve above-mentioned academic goals, the methods applied in this thesis include:(1) building numerical stimulation model on geological conditions, rock strength and mining technology on the plot and analyzing the laws of upper rock mass failure and stress distribution on numerical stimulation results and other relevant data.(2) establishing the height and the laws of water flowing fractured zone development in the process of dynamic mining and analyzing the laws of upper rock mass movement and deformation on numerical stimulation and other data.(3) establishing relevant formulas to project subsidence and ground deformation on fuzzy mathematics and other data.