Study on Similar Material Simulation on Upward Mining in Contiguous Seams Group

Based on the requirements of the upward mining in a mine, in order to obtain a failure height of the overburden strata and the development height of the crack zone after the coal miming in the seam group and thus to study the feasibility of the upward mining in contiguous seams group under the special geological condit ions, a physical test method was applied to the simulation study on the failure height of the overburden strata and the development height of the crack zone after the Co al mining in the seam of the below seam group and to analyze the mine roof strata pressure behavior law affected by the miming operations, the failure features of the 0 verburden strata and the variation law of the surrounding rock stress field and displacement field.The results showed that the failure height of the overburden was about 18.4 m, the development height of the crack zone was about 49.3 m and the top seam group was at the middle and top section of the crack zone in the low seam group. Therefore, based on three zone judgment method as the basis, with the certain safety measures conducted, the upward mining plan in the mine would be feasible with t he preliminary judgment.