Optimization parameters of the slope under open-underground combined mining

摘要

In the process of constructing high production and high efficiency coal mines, many new models of open-underground combined mining were adopted more and more.On the basis of openunderground combined mining of shallow horizontal thick coal in Pingshuo Mining District, three kinds of engineering geological models and numerical models were built by using two methods of physical model test and numerical simulation.Based on the stability of transportation platform of the slope, three criterions which included the maximum value of the differential settlement of the transportation platform, the convergence of settlement curves, and the connectivity of plastic zone were put forward.In order to reduce the waste of coal under the slope, boundary parameters of the open-underground mining were optimized through the contrastive analysis of the mining sequence.The engineering practice showed that optimized parameters have gained good results.In view of the facts that there are no mature experiences at home and abroad, the above-mentioned results have important theoretical meaning and popularization value for guiding the similar engineering practices.