Alpine region tunnel sidewall pilot tunnel drainage structure

Abstract

The invention discloses an alpine region tunnel side wall pilot tunnel drainage structure. The structure comprises a T-shaped tunnel side wall pilot tunnel provided with an electric heating automatictemperature control device, a water collecting and sand settling well is arranged at an intersection position, and a plurality of underground water seepage drainage guide pipes are driven into a rockstratum in a radial mode on the T-shaped tunnel side wall pilot tunnel. On the premise that tunnel safety is not interfered by the parallel pilot tunnels in the T-shaped tunnel side wall pilot tunnels, rainfall is concentrated outside the tunnel, water in surrounding rock bedrock foundation soil on the outer circle of the tunnel can be drained, soil consolidation is promoted, and lateral displacement and sedimentation of soil slope soil are reduced; the electric heating automatic temperature control device is installed in the vertical pilot tunnel, thereby ensuring that the underground water can enter pilot tunnel through the radial underground water seepage drainage guide pipes and then is drained out of the tunnel through a central drainage pipe under the condition that a longitudinal annular drainage blind pipe in a tunnel drainage system is frozen, blocked and loses drainage capacity in a long-term low-temperature environment of a tunnel; and the radial underground water seepage drainage guide pipes guide underground water into the pilot tunnel in a large range, and the effect is excellent.

Description

technical field [0001] The invention belongs to the technical field of diversion and drainage of tunnel side wall guide pits in alpine regions, and in particular relates to a diversion and drainage structure of tunnel side wall guide pits in alpine regions. Background technique [0002] The current tunnel lining design generally adopts C35 concrete with a thickness of 30cm-60cm according to the type of external surrounding rock. This thickness has no effect in areas with good temperature in the plains. The tunnel waterproof and drainage system can normally play the role of blocking and draining. However, the tunnels in the plateau alpine region or the high latitude extremely cold region are affected by the extreme low temperature and the duration of different degrees, and are also affected by the freezing depth to different degrees. Permafrost is common in these areas. Compared with permafrost lining, concrete has better heat transfer performance than permafrost. In fact, th...

AI Technical Summary

Problems solved by technology

The use of branch drainage tunnel method requires the construction of multiple branch drainage tunnels according to the terrain. The engineering volume is huge, and the terrain is difficult to meet the requirements.

Using the tunnel side parallel drainage tunnel method requires the construction of a drainage tunnel as long as the frozen length of the tunnel’s main tunnel. The accompanying problem is whether to construct a parallel drainage tunnel on the other side of the tunnel, and the project investment is huge.

Images