Study on long and short bolt coordinate support technology of mine soft rock roadway

In order to solve the serious mine strata pressure behavior and high support difficultyt of a mine high geostress and soft rock road-way,a theoretical analysis and numerical simulation method were applied and a long and short bolt coordinate support technology of themine soft rock roadway was provided. The results showed tha t a collocation utilization of the connectable long bolt and conventional bolt andan interaction force of the coordinated long and short bolt and the surrounding rock would n ot only ensure the surrounding rock with a highsupport strength,but also could be suitable for the large deformation of the mine soft rock roadway. The application of long a nd short boltcoordinate support technology to Puhe Mine showed that the technology could well support the mine roadway and could control the roof de-formation value of t he mine roadway within 100 ~ 200 mm. The application effect showed that the long and short bolt coordinate supportcould well fit the large deformation of the roof and coul d have a well control role of the surrounding rock.