Design method of compensation support force of short arm beam roof in non-pillar mining with automatically formed roadway and #br#
its influencing factors analysis
YANG Jun1，LIU Ben1，ZHOU Peng1，HUANG Long2，ZHANG Jun1，HOU Shilin1，WANG Yajun1，3，CHEN Fei4
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；2. Shanxi Bureau of National Mine Safety Administration，Taiyuan，Shanxi 030012，China；3. School
of Civil and Resources Engineering，University of Science and Technology Beijing，Beijing 100083，China；4. Shenmu
Ningtiaota Mining Co.，Ltd.，Shaanxi Coal and Chemical Industry Group Co.，Ltd.，Yulin，Shaanxi 719300，China)
Abstract：In order to realize the safety and stability of the short arm beam roof structure in non-pillar mining with automatically formed roadway. The balance mechanism and dynamical evolution of the roof structure of the short-arm beam are analyzed，and the mechanism of compensating the support of the anchor cable is clarified. The Hoek-Brown strength criterion and the upper bound analysis method in plastic mechanics are used to analyze the caving failure mechanism of the surrounding rock of the short arm beam roof under the support of the anchor cable. Therefore，the calculation formula of anchor cable compensation support force of short arm beam roof in three stages of caving friction, dynamic pressure effect and roadway stability is deduced. In addition，a method for compensating the support force of a short arm beam roof in a self-forming roadway without coal pillars is developed. On this basis，the sensitivity analysis index is established and the influence of different parameters on the compensation support force of the anchor cable is analyzed. It is demonstrated that the surrounding rock stress，roof cutting parameters and roadway width are the main control factors for cable compensation support forces，with the surrounding rock stress being the most sensitive metric. Thus，the engineering suggestions for the stability control of short arm beam roof are put forward. The research results were applied in the transportation roadway of 5101 working face of N00 mining method in Xintai Coal Mine，and good effect of field application was verified.
杨 军1，刘 奔1，周 鹏1，黄 龙2，张 俊1，侯世林1，王亚军1，3，陈 菲4. 无煤柱自成巷短臂梁顶板补偿支护力设计方法及其影响因素分析[J]. 岩石力学与工程学报, 2023, 42(4): 798-809.
YANG Jun1，LIU Ben1，ZHOU Peng1，HUANG Long2，ZHANG Jun1，HOU Shilin1，WANG Yajun1，3，CHEN Fei4. Design method of compensation support force of short arm beam roof in non-pillar mining with automatically formed roadway and #br#
its influencing factors analysis. , 2023, 42(4): 798-809.
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2023, Vol. 42 
