Study on the Law of Ground Subsidence for Shallow Buried and Thick Coal Seam by Fully Mechanized Caving Mining Method

Abstract

In order to master the law of ground surface movement and deformation for shallow buried and thick coal seam under condition of fully mechanized caving mining method, and to gain experience of “mining under buildings, water body and railway”, a ground surface movement observation station was established above 14106 and 14107 working face of No.1 Well which belongs to China Coal Pingshuo Group co., Ltd. Then a series of observation was conducted according to the requirements of relevant technology. After that, process of sorting, calculating, analysis was conducted based on the observation data. As a result, characteristics of surface movement and deformation under this mining and geological condition were mastered by author, the surface subsidence calculation parameters and some surface movement angle parameters was calculated. Based on analysis of ground depression velocity and deflection in the period of ground movement, it is concluded that shallow buried depth with fully mechanized caving mining method has a shorter ground movement active period than that of deep mine, at the same time, its maximum subsidence velocity is big, ground movement and deformation is strenuous and subsidence during ground movement active period occupies a huge proportion of the total subsidence.