Abstract:Country rocks in the depth of -270m in Lucun coal mine is muddy siltstone rock with low intensity. It contains clay minerals and water swelling. By using the traditional supporting way, it is difficult to guarantee stability of the roadway. Thus, supporting test has been carried out by using concrete filled steel tube stents. Geological characteristics of country rocks in truck yard at the depth of 270m has been analyzed, and comprehensive supporting scheme based on steel concrete frame has been put forward. Finally, it is confirmed theoretically that carrying capacity of concrete filled steel tubular frame are four times of U29 steel supports, and can meet the requirements for roadway support protection.
