掘进机工程机械类外文翻译、中英文翻译、外文文献翻译

英文文献Roadheader applications in mining and tunneling industriesH. Copur1, L. Ozdemir2, and J. Rostami31Graduate Student, 2 Director and Professor, and 3 Assistant ProfessorEarth Mechanics Institute, Colorado School of Mines, Golden, Colorado, 80401ABSTRACTRoadheaders offer a unique capability and flexibility for the excavation of soft to mediumstrength rock formations, therefore, are widely used in underground mining and tunnelingoperations. A critical issue in successful roadheader application is the ability to develop accurateand reliable estimates of machine production capacity and the associated bit costs. This paperpresents and discusses the recent work completed at the Earth Mechanics Institute of ColoradoSchool of Mines on the use of historical data for use as a performance predictor model. The modelis based on extensive field data collected from different roadheader operations in a wide variety ofgeologic formations. The paper also discusses the development of this database and the resultantempirical performance prediction equations derived to estimate roadheader cutting rates and bitconsumption.INTRODUCTIONThe more widespread use of the mechanical excavation systems is a trend set by increasingpressure on the mining and civil construction industries to move away from the conventional drilland blast methods to improve productivity and reduce costs. The additional benefits of mechanicalmining include significantly improved safety, reduced ground support requirements and fewerpersonnel. These advantages coupled with recent enhancements in machine performance andreliability have resulted in mechanical miners taking a larger share of the rock excavation market.Roadheaders are the most widely used underground partial-face excavat...