Abstract:

During tunneling in ground containing rich highpressure water, water inflow, mud bursting and collapse may occur due to the action the ground water, which may jeopardize the tunneling safety, the surrounding environment and even the tunnel operation. In the paper, the following two aspects are discussed on the basis of theoretical formulas, engineering cases and standards and specifications: 1) The water inflow rate and water pressure during tunneling are discussed on the basis of analysis on the ground water seepage flow rules and in the aspects of ground reinforcement and water stopping, pressure reducing under limited drainage and water pressure resistant lining; 2) The classification of the drainage rate in tunneling and the control of the content of mud and sand in water and particle size are discussed and some control parameters and standards are proposed. Finally, the control of the rich highpressure water in the construction of Zhongtianshan tunnel is presented. The paper can provide reference for similar works in the future.

Key words: high water pressure, waterrich tunnel, ground water control