Bearing characteristics and influence mechanism of lightweight and high-strength arch in deep roadway

Deep underground engineering often faces complex conditions such as high stress and extremely soft rock. Due to the problems of heavy self-weight, insufficient bearing capacity and low construction efficiency, the traditional steel arch cannot meet the requirements of safe and efficient construction of underground engineering in deep and complex conditions. Based on this, a new lightweight high-strength arch support technology is developed, and full-scale mechanical tests of lightweight high-strength arch and U36 arch are carried out. The test results show that compared with U36 arch, the initial sliding resistance and ultimate bearing capacity of lightweight high-strength arch are increased by 37.6% and 20.1% respectively with 33.3% weight reduction. The new support can provide higher support strength for the surrounding rock of deep roadway while reducing the construction strength. On this basis, a full-scale numerical model of the lightweight high-strength arch is established. The influence mechanism of the lightweight high-strength arch bearing performance is clarified. The bearing capacity calculation equation of the lightweight high-strength arch is established. Taking the typical deep high stress mine as the engineering background, the field application of lightweight high-strength arch is carried out.