Study On Distributing Rules Of Ground Pressure And Control Countermeasure In The Stope Of YuHuaSi Mine

Pressure control is the most important matter in the mining planning, mining method experimentation and mine process. Its basic theory includes the control of the distributing laws on the stress and strain of laneway's wall rock in mining activity, and the deformation and failure of extraction structural system, and the control of the bad progress tendency by taking rational measures for the sake of mining system stably and production process safely. In order to finish pressure control effectively, we first understand the ground pressure activation rules fully in the extraction process. By means of FEM we can numerically simulate the whole mining process in the project design, and also forecast the ground pressure activation rules in the course of mining extraction and put forward the backing of pressure control. At the same time, we must regularly supervise the ground pressure locally, duly master it emerge occasions in mining works and so prevent the mining system from losing its stability.This paper is based on the production practice of YuHusSi mine, and several sections are studied in the paper.In the first chapter, for seeking the rational stoping procedure and cutting down the failure of extraction opening because of the ground pressure activations, some FEM numeration models are founded by the rules of deadweight stress field in this paper, later a series of excavating projects are simulated one by one. After analyzing the stress distributions this paper draws out the sound mining sequence for YuHuaSi mine.Secondly, the most factors are analyzed of influencing the convergence of laneway's wall rock by virtue of supervision and survey. Because the system of artificial neural network has characteristics of adaptability, non-linearity, self-study and memorial function, in this paper, BP neural network model is founded for forecasting the convergences of laneway rock mass. After having learnt the sample cases, the problem model is tested by the classified samples and very good predicts results are got.Thirdly, in this paper, a new design method based on above predicts results on shotcrete and bolt support was brought forward and its material design rule was provided after expatiating its mechanics principia and studying on all design methods. Finally, the influencing factors of shotcrete and bolt support are analyzed, and so the improvement measure are advised for YuHuaSi mine.