关键词: 沿空留巷, 顶板下沉, 影响因素, 力学模型, 定量分析, 灰色关联分析

Abstract: Aimed at the large roof subsidence and difficulty in controlling gob-side entry retaining，roof subsidence mechanics model was established on the basis of the energy conservation principle after analyzing the surrounding rock deformation law.A calculation formula of roof subsidence was also worked out，and influencing factors of roof subsidence were analyzed by quantitative analysis and grey relational analysis methods.Results showed that the calculated roof subsidence is 371.45 mm which matches with the field measurements.So the roof subsidence calculation formula is accurate.Roof subsidence was increased with the lane width and mining depth increase，and decreased with increase of roof thickness，in-lane support resistance，coal wall lateral support resistance，filling body width and its elastic modulus.Influencing factors for the roof subsidence of gob-side entry retaining were gradually becoming lower from mining height to elastic modulus，filling body width，immediate roof thickness，in-lane support resistance，lane width and coal wall lateral support resistance.Its incidence degrees were 0.96，0.73，0.68，0.52，0.28，0.13 and 0.04 respectively.These results provide a theoretical foundation for effectively controlling surrounding rock deformation of gob-side entry retaining.

Key words: Gob-side entry retaining, Roof subsidence, Influencing factors, Mechanics model, Quantitative analysis, Grey relational analysis