Plateau long tunnel multi-dead end ventilation construction method

Abstract

The present invention discloses a plateau long tunnel multi-dead end ventilation construction method. A tunnel inclined shaft is disposed at one side of a main cave of a plateau long tunnel, a middle connection section of the main cave is an inclined shaft auxiliary construction section which is divided into an inclined shaft auxiliary construction entrance section and an inclined shaft auxiliary construction exit section, and the inclined shaft auxiliary construction exit section has a sudden surging point and intersects with derious parallel adits. The construction method comprises a first step of ventilator installation; and a second step of tunnel excavation construction, carrying out excavation construction on the inclined shaft auxiliary construction entrance section and the inclined shaft auxiliary construction exit section through the tunnel inclined shaft while carrying out excavation construction on a tunnel entrance section and a tunnel exit section, and assisting the excavation construction through the derious parallel adits while carrying out excavation construction on the inclined shaft auxiliary construction exit section. The method provided by the present invention is simple in procedure, reasonable in design, convenient to construct, excellent in ventilation effect, and capable of solving problems of a large amount of roadways requiring ventilation during a tunnel construction process, long ventilation distance and large difficulties in ventilation construction.

Description

technical field [0001] The invention belongs to the technical field of tunnel ventilation construction, and in particular relates to a single-head multi-lane ventilation construction method for a plateau long tunnel. Background technique [0002] A plateau usually refers to a relatively complete large-scale uplifted area with an altitude of more than 1,000 meters, a vast area, open terrain, and the surrounding area is bounded by obvious steep slopes. The track surface of Daliang Tunnel in the middle and high mountainous area of ​​Qilian Mountains is 3607m above sea level, and the total length of Daliang Tunnel is 6550 double extension meters. It is located in Menyuan County, Qinghai Province. It is 3607.4 meters; the normal water inflow is 15,300 cubic meters, and the maximum water inflow is 45,800 cubic meters; the cave body passes through sandstone, slate and F5 fault fracture zone. Such as figure 1 As shown, in the actual construction of Daliang Tunnel, in order to impr...

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Problems solved by technology

During the construction of Daliang Tunnel, there have been many major hydrogeological changes such as water inrush and rock inrush, especially in the direction of the exit of the tunnel, there have been many large-scale water inrush and rock inrush incidents that have hindered the construction. Therefore, it is necessary to carry out pre-designed construction Adjust the plan and add a horizontal guide (that is, a parallel guide tunnel parallel to the main tunnel 2), so that the number of tunnels that need to be ventilated during tunnel construction is large and the ventilation distance is long, making the construction difficult. Currently, there are very few reference materials

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