Abstract
Abstract: In order to solve the problem of "three unders" coal resources and respond to the national green mining policy, combining with the advantages of short wall strip filling and long wall strip filling, we propose a longitude and latitude filling mining method with high recovery ratio and simple operation,where a latitude and longitude filling network is gradually constructed behind the working face to control the subsidence of the overlying strata.This article introduces the filling system, technological process and filling pipeline layout of the latitude and longitude filling mining method, and constructs the latitude and longitude filling mechanics model by using the elastic foundation theory, and gives the calculation formula for the roof subsidence and the stress of the filling body.By means of numerical simulation,the control of the longitudinal and latitudinal filling overburden was researched.The influence of the quality of the filling, the width of the filling, the spacing of the filling on the roof subsidence and the reasonable filling parameters of the 1207 working face were determined.The roof subsidence, the stress of the filling body and the deformation of the ground surface during the mining process were monitored by means of field monitoring, and the excellent control effect of the latitude and longitude filling mining on the overlying strata is confirmed in practical applications.