Prediction Theory And Experiment Research Of Overburden And Surface Movement Deformation Evolution Regulation

Overburden and surface movement due to underground mine is a very complex process. Yet regulation of overburden and surface movement with researching its prediction theories is a kind of effective method which can appropriately give an overall consideration of mining, protect surface structures, water body and guarantee coal mine safe productivity. Based on probability integral theory the paper created an influence function model by which surface movement and deformation of any shape face mining could be predicted. Through processing and analyzing large quantities datum, function relational expression between stratum propagation angle and coal seam angle was gained. According to probabilistic mediator theory, static prediction model which can predict overburden movement and deformation for horizontal angle coal seam was put forward. Based on static prediction model, dynamic prediction model of overburden and surface movement and deformation integral system was constructed by using of Knothe time function. Furthermore, the formula between subsidence factor and stratum level was obtained. Based on Visual Basic language dynamic prediction system which owned good interface, convenient operation method, and function of real-time outputting graph was developed. Utilizing Huobaoganhe coal mine geological datum, similarity material simulation experiment was done. Traditional theodolite surveying method and digital close-range photogrammetry method were used to measure set points and surveying results and precision were analyzed, which proved that proposed dynamic prediction model was true and digital close-range photogrammetry method was feasible during similarity material simulation experiment surveying. After coal was extracted, overburden stress field, destroyed field and displacement field were researched by using of FLAC3D. Moreover, surface movement and deformation regulation, surface destroyed field, monitor points' velocity, relation between subsidence value and face advances were detailed analyzed. Developing process of surface destroyed field was inversed after mining panel was changed. And the formula between overburden subsidence factor and stratum level was verified. By use of Biot consolidation theory the effect of water-bearing alluvium dehydration consolidation by fluid-mechanical interaction on mining subsidence was profoundly researched associating effective stress theory from mechanics. It was interpreted that mining area with water-bearing alluvium, especially east coal mines final subsidence profile brim converged very slow.