Control Technology of Floor Roadway Under Mechanized Caving Mining in Luling Mine Super High Seam

According to the problem that the floor rise entry is difficult to maintain under mechanized caving mining in Luling Mine super high seam.The field investigation and numerical simulation have been used to analyze the deformation and failure reasons of the roadway,and the root reasons,fully mechanized caving face cross-mining, poor integrity of the surrounding rock,no support measures of the floor,that cause roadway deformation instability are pointed out,and then control scheme including shed grouting and key parts anchor cable beam is put forward. Engineering practice shows that the roadway's severe deformation can be controlled effectively by this scheme,and the relative displacement of roof-to-floor reaches to 233 mm and sidewall convergent is 118 mm after overhead mining.