Stability Analysis of Loose and Water-rich Surrounding Rock in Coal Mine Inclined Shaft and Engineering Application

For the fact that Gujiao Mining Area in Shanxi province passes through a project of a loose and water-rich surrounding rock for mine inclined shaft, based on conditions of engineering geological exploration, the main aquifers were phrased to conduct numerical simulation analysis.Research findings show that negative pore water pressure happens after working face enter sandy gravel layers, while when reaching medium sandstone layers, working face is of a larger shear-tension failure.And failure zone increases along with excavation depth.Grouting behind shaft and surface ground pre-grouting are adopted in topsoil layer to control water burst, and shaft lining structure is reinforced concrete brickwork.On the other hand, on the interface between topsoil and bedrock is a support pattern of working face pre-grouting advance reinforcement, primary support of steel mesh spray shed frame and the second support of concrete lining.To evaluate support effect, drilled core sampling is used to perform compressive strength test and acoustic detection of slurry concretion.And real time monitoring is conducted as to convergence deformation, the stress state of support structure of shaft typical section and surface buildings settlement observation.Accordingly, results show that the largest convergence of two sides and roof to floor are about 75mm and 55mm respectively, that reinforcement stress remains far less than yield strength, that land subsidence is controlled at 15mm, and that shaft lining structure under stress is reasonable and has a high safety reserve, ensuring surrounding rock stability of the inclined shaft. © 2020, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.