1、 中文中文 6800 字，字，4700 英文单词，英文单词，26500 英文字符英文字符 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 A method for the design of longwall gateroad roof support W. Lawrence Geowork Enginee
2、ring, 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 equati
3、ons. GRSM defines suggested rof 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
5、, 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 quantifying roof support is adopted as a base template (GRSUP). The statistical analyses indicated that an improved quanti
6、fication of installed support can be gained by simple modifications to the standard formulation of GRSUP. The position of the mathematically determined stable/failed boundary in the design charts can be changed depending on design criteria and specified risk. Keywords: Coal mine; Roof control; Support; Design 1. Introduction Longwall gateroad strata stability is essential to ensure uninterrupted production. In Central Queenslands Bowen Basin, immediate gateroad roof lithology varies from coal
