Study On Surface Movement And Deformation Of Deep Coal Mining And Its Engineering Application

With rapid economic and social development of our country, and accelerated the implementation of infrastructure construction projects, the demand for energy and mineral resources show a rapid growth trend, especially under the condition of coal resources exploitation. This makes our country a large number of shallow coal mine resources facing depletion. As energy demand continues to expand and mining intensity continued to. increase, coal mining is continue to be extended to the deep. Sharp increase in rock deep mining conditions in the special environment of high temperature and pressure, combined with the sudden development of stress and tectonic stress, make the roadway and face surrounding rock deterioration of geological environment and the accident probability increase. These arouse displacement and deformation from the overlying strata and ground posed a great threat to the ground, production and life, and the manifestation of the causes of engineering disasters and frequency significantly different from shallow. Goaf on the deep mining caused by overburden and surface movement and deformation of the theoretical issues and the security and stability of the surface building foundations will become increasingly salient, so the deformation of the overburden in the goaf of great depth and surface mobile the study has major theoretical and practical significance.This study based on Hedong coalfield of northern Shanxi, a large mining deep coal mine goaf, with the use of similar material simulation, designs two sets of models under different mining depth:model Ⅰ, the mining depth is741m, and the mining height is7m; model Ⅱ,the mining depth is1143m, and the mining height is7.3m. Large amounts of data based on observational trials derived, arrive at different models of mobile deformation curve, using mathematical statistical methods.And then to study the impact of trend of the goaf to security and stability on the surface and foundation under deferent mining depth. Also, summed up the damage development of the influence of deferent models and deformation law of surface movement under the influence of mining depth, as well as the stable time of the different models after the completion of mining.For more comprehensive discussion of the impact of mining depth and mining thick overburden in the goaf and surface movement and deformation, and construction loads on the old goaf foundation stability, this study also uses a numerical simulation to calculate the researched questions. With advances in computer technology, numerical simulation methods widely used in engineering practice shows a impressive consequent of technical and economic. This study, based on the construction loading size、loading position、mining depth and mining thickness of the influencing factors, designed different orthogonal model, and comprehensively study the influence that the size of building load, load location, mining height and mining depth impose on goaf rock and ground movement and deformation.Using similar material simulation test and ANSYA numerical simulation method of combining, design evaluation model for Hedong coalfield north and south of the two mines. With comprehensive consideration of similar and numerical simulation results, through the analysis of ground movement and deformation value under the action of mining surface movement and deformation values and additional loads of different models, and with reference to the foundations of security and stability evaluation criteria, provides an evaluation of safety and stability of goaf power building foundations in Hedong coalfield north-south mining area, In order to make guidance for buildings especially power building foundation surface stability safety in the old mined-out area of these areas.