摘要
Abstract
When using traditional anchor spray support for soft rock roadway in the first panel area of the No.5-1 coal seam in An'ping Coal Industry,there existing problems such as serious roadway deformation and anchor rod detachment,etc,which seriously affect the safety production and operation efficiency of the mine.Therefore,based on the theories of structural mechanics and geomechanics,a method combining numerical simulation and on-site practice is adopted to simulate and analyze the displacement and stress changes law of three different steel structures,namely U-shaped steel,I-beam steel,and steel rail steel,in soft rock roadway support,and to apply them in on-site practice.The results show that U-shaped steel has the best deformation resistance capacity,with an overall deformation amount of 85.0%of steel rail steel,followed by I-beam steel,the overall deformation amount is 92%of steel rail steel,while steel rail steel has the weakest deformation resistance capacity;The main stress location of the three types of supporting steel structures is at the joint of the supporting shoulder and waist.When simulating the support of a 10 m long roadway,the deformation degree of the 4-6 m middle roadway surrounding rock is greater than that in the head and tail roadway surrounding rock;When the horizontal stress is relatively high in deep soft rock roadways,the displacement of the roadway heaving floor is greater than that in shallow roadways only when side roof support is adopted.The research results provide strong guarantees for the safe production and efficient operation of mines.关键词
软岩/巷道/钢结构/支护Key words
soft rock/roadway/steel structure/support分类
矿山工程
