COAL ENGINEERING ›› 2017, Vol. 49 ›› Issue (10): 73-76.doi: 10.11799/ce201710018

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Instability mechanisms and supporting technology study for track downhill in highly stressed soft rock

  

  • Received:2016-09-27 Revised:2016-11-05 Online:2017-10-25 Published:2018-03-22

Abstract: Abstract: Aiming at problems about large deformation and failure of high stress and large deformation of soft rock roadway, the track downhill in 14 mining area of Hongling Mine in Henan province was taken as an example to study and analyze the deformation mechanism and rework control technology. Main deformation and failure forms of the downhill include roof subsidence even roof caving, two sides’ extrusion, spandrel, side wall brickwork fracture and floor heave. Results of experiment on physical and mechanical properties of surrounding rock and loose circles test show that surrounding rock contains many mudstone and sandy mudstone with low integral strength and formed larger loose circles. Based on classification method of surrounding rock loose circle and analysis of roadway’s supporting theory, the coupling support method with “anchor bolt (anchor cable) + U steel retractable support + anchor + grouting” was put forward to rework track downhill. Using numerical simulation of the support method, we analyze the stress distribution, displacement distribution and plastic zone distribution of surrounding rock. Filed test was carried out, and the application shows that roof and floor convergences of roadway was less than 121 mm after 100 days, sides convergences was less than 82 mm and late convergence rates was less than 1.0 mm/d, and the track downhill kept in a stable state.

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