The technology of pressure relief gas drainage is one of the most effective and economic for preventing gas emissions in underground mines.Based on current understanding of strata breakage and fracture development in ...The technology of pressure relief gas drainage is one of the most effective and economic for preventing gas emissions in underground mines.Based on current understanding of strata breakage and fracture development in overlying strata,the current study divides the overlying strata into the following three longitudinal zones in terms of the state of gas flow:a turbulent channel zone,a transitional circulation channel zone and a seepage channel zone.According to the key strata discrimination theory of controlling the overlying strata,the calculation method establishes that the step-type expansion of the mining gas channel corresponds to the advancing distance of working face,and this research also confrms the expanding rule that the mining gas channel in overlying strata follows the advancing distance of mining working face.Based on the geological conditions of Xinjing Coal Mine of Yangquan,this paper researches the expanding rule of mining gas channel as well as the control action of the channel acting on the pressure relief flow under the condition of the remote protective layer,and got the distance using inversion that the step-type expanding of mining gas channel is corresponding to the advancing distance of working face,which verifes the accuracy and feasibility of theoretical calculation method proposed in this study.The research provides the theoretical basis for choosing the technology of pressure relief gas drainage and designing the parameters of construction.展开更多
Pilot case of provincial digital village and town construction in Yidukou Town of Lingcheng District of Shandong Province is taken as research object.On the basis of defining the connotation and characteristics of dig...Pilot case of provincial digital village and town construction in Yidukou Town of Lingcheng District of Shandong Province is taken as research object.On the basis of defining the connotation and characteristics of digital village,and analyzing development status of digital village in Yidukou Town,construction ideas,system architecture and key action plans of digital village empowering rural revitalization are studied,and the mode and path of digital village empowering rural revitalization are explored.展开更多
I. The parties held serious and productive discussions onthe actions each party will take in the initial phase for theimplementation of the Joint Statement of September 19,2005. The parties reaffirmed their common goa...I. The parties held serious and productive discussions onthe actions each party will take in the initial phase for theimplementation of the Joint Statement of September 19,2005. The parties reaffirmed their common goal and will展开更多
基金the National Basic Research Programs of China (No. 2011CB201204)the National Natural Science Foundation of China (Nos. 51074160)+1 种基金the Fundamental Research Funds for the Central Universities (No. 2010QNA03)Project Funded by the Priority Academic Program Development of Jiangsu Higher Education institutions for their support for this project
文摘The technology of pressure relief gas drainage is one of the most effective and economic for preventing gas emissions in underground mines.Based on current understanding of strata breakage and fracture development in overlying strata,the current study divides the overlying strata into the following three longitudinal zones in terms of the state of gas flow:a turbulent channel zone,a transitional circulation channel zone and a seepage channel zone.According to the key strata discrimination theory of controlling the overlying strata,the calculation method establishes that the step-type expansion of the mining gas channel corresponds to the advancing distance of working face,and this research also confrms the expanding rule that the mining gas channel in overlying strata follows the advancing distance of mining working face.Based on the geological conditions of Xinjing Coal Mine of Yangquan,this paper researches the expanding rule of mining gas channel as well as the control action of the channel acting on the pressure relief flow under the condition of the remote protective layer,and got the distance using inversion that the step-type expanding of mining gas channel is corresponding to the advancing distance of working face,which verifes the accuracy and feasibility of theoretical calculation method proposed in this study.The research provides the theoretical basis for choosing the technology of pressure relief gas drainage and designing the parameters of construction.
文摘Pilot case of provincial digital village and town construction in Yidukou Town of Lingcheng District of Shandong Province is taken as research object.On the basis of defining the connotation and characteristics of digital village,and analyzing development status of digital village in Yidukou Town,construction ideas,system architecture and key action plans of digital village empowering rural revitalization are studied,and the mode and path of digital village empowering rural revitalization are explored.
文摘I. The parties held serious and productive discussions onthe actions each party will take in the initial phase for theimplementation of the Joint Statement of September 19,2005. The parties reaffirmed their common goal and will
