1、 4800 英文单词，英文单词，2.5 万英文字符，中文万英文字符，中文 7000 字字 文献出处：文献出处：Lawrence W. A method for the design of longwall gateroad roof supportJ. International Journal of Rock Mechanics and Mining Sciences, 2009, 46(4): 789-795. 英文原文英文原文 A method for the design of longwall gateroad roof support W.Lawrence Geowork Engi
2、neering,Emerald,QLD,Australia Abstract A longwall gateroad roof support design method for roadway development and panel extraction is demonstrated. It is a hybrid numerical and empirical method called gateroad roof support model（GRSM）, where specification of roof support comes from charts or equatio
3、ns. GRSM defines suggested roof support densities by linking a rock-mass classification with an index of mining-induced stress, using a large empirical database of Bowen Basin mining experience. Inherent in the development of GRSM is a rock-mass classification scheme applicable to coal measure strat
4、a. Coal mine roof rating （CMRR） is an established and robust coal industry standard, while the geological strength index（GSI）may also be used to determine rock-mass geomechanical properties.An elastic three-dimensional numerical model was established to calculate an index of mining induced stress, for both roadway development and longwall retreat. Equations to calculate stress index derived from the numerical modelling have been developed. An industry standard method of qu
