EXPERIMENTAL RESEARCH ON GOB-SIDE ENTRY RETAINING SUPPORTED BY FILLING TWO MATERIALS
CHENG Yunhai1，2，JIANG Fuxing2，LI Haiyan3
(1. Key Laboratory of Safety and High-efficiency Mining of Ministry of Education，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. College of Civil and Environmental Engineering，University of Science and
Technology Beijing，Beijing 100083，China；3. Geotechnical and Structural Engineering Research Center，
Shandong University，Jinan，Shandong 250061，China)
Abstract：Gob-side entry retaining by filling has two shortcomings in high stress or encountering overlying strata violent movement，i.e. rigid material filling easily lead to packing wall stress concentration，even fractured or failure，caused fire or CO，CH4 leakage，and flexible material filling easily lead to roof cave-sink too large and even the occurrence of roof fall. In order to solve the problems，filling method was improved in Huaheng coal mine. Based on the study on the overburden stratum movement process and structure morphological characteristics above gob-side entry retaining，we calculated the amount of compression of the filling body，and two strength grades of roadway supports of gob-side entry retaining were design：the upper filler is high expansion to firmly seal the gap，and adapting impact load of the main roof movement；the lower filler strength support specific roof. Based on mechanical model established，the lower filler strength is calculated；Based on structure model established，the lower filler strength is calculated. Mineral pressure observation showed that the design of gob-side entry retaining met the application requirements.
钱鸣高，刘听成. 矿山压力及其控制[M]. 北京：煤炭工业出版社，1984：32-87.(QIAN Minggao，LIU Tingcheng. Ground pressure and strata control[M]. Beijing：China Coal Industry Publishing House，1984：32-87.(in Chinese))
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2012, Vol. 31 
