Guo Liwen

Notice of Retraction Statistics Analysis of death Accident in Coal Mines from January 2005 to June 2009

In this paper, death accident in coal mines were tidied using the method of mathematical statistic from January 2005 to June 2009. By linking aspect such as accident types, time rule of accident happens, provincial statistics, causes of accident, the thesis analyzed the characteristics and rules of coal mine accidents, introduced the particularity and damages of coal mine accidents, the results has vital significance to enhance the technique of forecasting and preventing the coal mine accidents, establish perfect the countermeasure and emergency disposal plans for accident, and do well the safety in producing.

Notice of Retraction Study and application of optimization design scheme of roadway bolt support parameter

According to the incomplete clear mechanism of bolt support action presently, the bolt support parameter of 12910 face haulage roadway is given optimized design in HANDAN TAOYI mine by the analytic system software: ANSYS, using theory analysis, numerical simulation and engineering actual measurement. The surrounding rock failure region of the optimized roadway is 12.54m2, decreased by 31.0% compared to present bolt support roadway, which has theoretical significance and practical value in popularizing bolt support technique and ensuring the support roadway safe and reliable.

Utilization of Oil Shale Retorting Technology and Underground Overview

The paper analyzes the worlds oil shale development and status of underground dry distillation technology and, through case studies proved the advantages of underground dry distillation technology. Global oil shale resource-rich, many countries in the development of oil shale technologies to deal with oil shortages. Although at this stage the ground oil shale distillation technology has become more mature, but because of high investment, high cost and limited scope, and serious shortcomings of ecological destruction, many companies and research institutions are active underground oil shale retorting technology. A typical underground dry distillation technology at this stage include: Shell ICP technology, Exxon Electro frac TM technology, the United States shale oil companys technology, Pyrophase underground radio distillation technology, China University of Mining and Technology Underground pyrolysis gasification, etc. Hainan Changpo mining case study that made use of CUMT underground retorting of oil shale development program can improve the effectiveness of mine120%.