Rapid pre-reinforcement grouting method for excavation of tunnel face of deeply-buried high-pressure water-rich tunnel

Abstract

The invention provides a rapid pre-reinforcement grouting method for excavation of the tunnel face of a deeply-buried high-pressure water-rich tunnel. The rapid pre-reinforcement grouting method for excavation of the tunnel face of the deeply-buried high-pressure water-rich tunnel comprises the following steps that tunnel surrounding rock parameters are determined, and a hole distance is calculated according to the surrounding rock parameters; a drilling scheme is determined according to the section area of the tunnel; drilling is conducted in different areas and steps according to the drilling scheme, and drilling is stopped when the drilling depth is reached; a high-pressure water jet device is started, rock mass within the drilling length range is cut through drilling arm hole high-pressure water, and a pre-fracture is generated to form a slurry diffusion channel; a grouting device is started, rapid initial setting grout is pressed into the rock mass, and rapid diffusion of the grout to the excavation face is achieved through the pressure difference between the rock mass and the excavation face of the tunnel; and the grouting effect is checked, and whether the grout is reinjected or not is judged according to the tunnel face surrounding rock water seepage condition. According to the rapid pre-reinforcement grouting method for excavation of the tunnel face of the deeply-buried high-pressure water-rich tunnel, on-site dynamic regulation and control can be achieved, the pressure difference between fracture water and the excavation face is fully utilized, the number of drilled holes is reasonably optimized, the time consumption is shortened, grouting materials are saved, the disaster occurrence frequency is effectively reduced, and it is ensured that the high-pressure water-rich tunnel safely communicate.

Description

technical field

[0001] The invention relates to the technical field of tunnel engineering construction, in particular to a rapid pre-reinforcement grouting method for tunnel face excavation of deep-buried high-pressure water-rich tunnels. Background technique

[0002] With the continuous advancement of the western development, the infrastructure construction in the southwest region has developed rapidly, and tunnels have been built in various places. In some parts of Southwest China, the rock mass properties and hydrological conditions contributed to the formation of karst landforms; under the geological conditions of karst landforms, when tunnels are built through karst-developed areas, water and mud inrush often occur. Engineering disasters: A large amount of groundwater pouring into the tunnel will cause mechanical equipment damage and casualties, increase the project cost, and delay the construction period; once water and mud inrush occur, it will consume a lot of financ...

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