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15 August 2020, Volume 49 Issue 08

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Study on Surrounding Rock Control Technology of Roadway in Deep Fractured Rock Mass

2020, 49(08):  1-7. 

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 Because of the broken surrounding rock，there were obvious deformation and destruction phenomena after roadway excavation when a gold mine entered into deep mining，which was difficult to meet the stability requirements during its service period. In order to solve these problems，field investigation，numerical simulation and field test were carried out. Firstly，the characteristics of roadway deformation and failure were analyzed. It was considered that the roadway failure in this mine was characterized by two sides of failure，and then developed to the roof. Secondly，from the view of fully utilizing the self-supporting capacity of surrounding rock，the design scheme of roadway with horseshoe-shaped section was put forward. The stress characteristics of rectangular roadway，straight wall semi-circular arch roadway，straight wall three-core arch roadway and horseshoe-shaped roadway were simulated by numerical simulation. The results showed that when the horseshoe-shaped roadway was adopted，the range of stress relaxation zone could be reduced，the stress conditions of surrounding rock could be improved，and the deformation and failure of surrounding rock could be restrained to the greatest extent. Thirdly，the optimum supporting scheme of horseshoe-shaped roadway is given. On the basis of traditional supporting roof bolts， two sides of bolts and through strips were added. Among them，the roof bolt spacing was 1.5 m，the two sides of bolts spacing was 1.0 m，and the row spacing was 1.0 m. Finally，the obtained horseshoe-shaped roadway was applied to the engineering practice of -900 m sublevel combined roadway in the mine. The results show that there is no obvious deformation and failure of the surrounding rock after horseshoe roadway construction，which has achieved good construction results and ensured the stability of the roadway. The study provided references for the surrounding rock control technology of this type of deep fractured rock mass roadway.