The Neijiang-Liupanshui Railway is distributed with high-position dangerous rock masses.During 2020-2023,several rockfall events occurred,which destroyed railway facilities and equipment and seriously threatened the safety of railway operation.Through field investigations,Unmanned Aerial Vehicle(UAV)oblique photography,numerical simulations and other methods,a study was conducted on the characteristics and dynamic processes leading to disasters caused by the dangerous rock masses in the sandstone-mudstone interbedded formation.The results show that due to the differential weathering of mudstone and sandstone,the mudstone softens when it encounters water and disintegrates after losing water,resulting in the bottom of the sandstone to be suspended in the air.The thick-bedded sandstone zones are cut by two sets of steeply dipping joints,most of which are cut into columns or slabs,making them prone to suspended falling or sliding collapses.The dangerous rock masses experience falling,fragmentation due to impact,rebound,and subsequent falling during the instability process.The collapse of Dangerous Rock Mass I-3 will generate an impact energy of 1.6×10⁶ kJ along the railway line.By using double-anchorage section prestressed anchor cables to reinforce the dangerous rock masses,good remediation effects have been achieved,solving the technical problems of anchorage durability and prestress loss in the in-situ remediation of high-position,steep dangerous rock masses.
sandstone-mudstone interlayercollapse of dangerous rock massnumerical simulationin-situ remediationdouble-anchoring section prestressed anchor cable
维普
万方数据
