Numerical Simulation Analysis of Construction Support of Intersection Section in Extra-long Water Diversion Project Tunnels

Abstract

The selected Middle Yellow River Diversion Project is an important backbone project of the planning and construction of the modern water network in Shanxi Province. The project is composed of water source project and water transmission project, the water transmission project is about 400 kilometers long, there are about 200 kilometers of total dry, about 100 kilometers of East Dry and West Dry each, with an average depth of about 400 meters. The intersection section studied in this paper is located under the ridgeline of Lvliang Mountain with a burial depth of more than 600 meters. Whether to support the excavation of the tunnel intersection section was simulated by three-dimensional numerical simulation analysis of different sections. The stress field of surrounding rock and liner and the distribution of plastic zones in surrounding rock were simulated and calculated. The research results provide a technical reference for the design of tunnel support and the formulation of construction schemes, which is of great significance for the construction safety and operation management of water diversion tunnels.