Overburden And Surface Movement Due To High Efficient Mining Extra-thick Coal Seam And Prediction Method

CORS was introduced to measure surface subsidence of 8104 face at Tashan mine, some angle parameters of surface subsidence basin and probabilistic integral prediction parameters due to high efficient mining extra-thick coal seam of Tashan mine are obtained, and the measured data of CORS and the levelling was compared and the results showed using CORS to survey surface subsidence is reliable. The laws of rock dynamic movement and separation development were studied by similarly model test. Based on bursa 7 parameters model a new method survey coordinates was developed for similarly model test. The advantages and disadvantages of the survey angles, the close-range photogrammetry, and the survey coordinates for similarly model test were analyzed. Under different mining conditions of 8104 face, the laws of dynamic overburden strata and surface displacement field, disruption field and stress field were reversed by FLAC3D. According to the probabilistic integral method, the Knothe time function, and the key bed theory, a model was made for predicting the rock and surface dynamic movement, and it also can predict the dynamic development of separation, and the measured data of the T2291 face at some mine validated the validity of the model. The interval estimation method for calculating the parameter of Knothe time function was developed by the size of gob which is about up to full extract, and the validity of the way was illustrated by measured data. The dynamic development of overburden and surface movement and separations of the 8104 face were reversed by the model.