Strata and surface influence range of deep coal mining for mine land reuse.

Determining the strata and surface movement of deep mining can provide a scientific basis for wellbore protection and mine land utilization. In this paper, numerical simulation methods were employed to investigate the stratum and surface movement boundary curves of deep caving and backfilling mining. The findings can be concluded in three aspects. First, the stratum and surface movement boundaries of deep caving and backfilling mining were all curved and conformed to an exponential function, but the influence range of strata and surface movement of deep different mining methods were different. Second, the backfilling rate of deep backfilling mining had an impact on movement boundary boundaries of strata and surface. With the backfilling rate decreasing, the influence range of strata and surface movement boundary were increased. Last, the research results were applied to a case to confirm the new approach of determining the influence range of strata and surface movement of deep mining. The example application shows that it not only can ensure the safe production of the wellbore, but also can enhance the reuse area of the mine field. [ABSTRACT FROM AUTHOR]