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blasting in roof on gob-side entry without roadside support Zhang Kai-zhi, Liu Bao-cheng Department of resources and civil engineering, Shandong University of Science and Technology, Tai-an 271000 China Abstract In order to solve the problem that when using gob-side entry retaining, the overall cost of roadside support was expensive, the construction technology was very complicated and the stability of roof rock destroyed easily, gob-side entry retaining without roadside support that based upon the roof control theory was presented. According to the analysis of the roof movement process accompanied with advance blasting in roof on gob-side entry retaining without roadside support, the paper summed up a conclusion that roof movement consisted of two periods, which was active period and stable period. The motion state of roof was dominated by revolving in active period, while parallel subsidence in stable period. For roof, in order to improve the capability of resisting deformation, the roadway support was required high strength and constructed timely, so the super-long anchor cable with high strength combined with concrete filled steel tube was a better choice. Then, the basic mechanical model was built up, and maximum roadway support force was solved. Additionally, the research results were applied to practice successfully.

Control design of roof rock for advance blasting in roof on gob-side entry without roadside support