Tunnel structure to prevent air cross-contamination

Abstract

The invention relates to a tunnel structure for air cross pollution prevention. According to the tunnel structure for air cross pollution prevention, the structure is simple, construction is convenient, the cost is low, and the adaptability is good. According to the technical schemes, according the tunnel structure, an open cut tunnel structure of a certain length is arranged at the outlet end of a mined tunnel; the open cut tunnel structure is provided with an open cut tunnel lining connected with and communicating with a mined tunnel lining, an air exhaust vertical well connected with and communicating with the top of the open cut tunnel lining, side slopes arranged on the two sides of the open cut tunnel lining along the open cut tunnel lining and a tunnel hole door wall arranged at the end, away from the mined tunnel, of the open cut tunnel lining and connected with the side slopes on the two sides, and backfilling is sequentially conducted between the side slopes on the two sides to form a M10 wet masonry piece stone layer, a soil and stone backfilling layer I, a clay water partition layer and a soil and stone backfilling layer II; and the upper end of the air exhaust vertical well is exposed out of the upper surface of the soil and stone backfilling layer II, and the upper end of the air exhaust vertical well communicates with an air exhausting device located above the open cut tunnel lining. The tunnel structure for air cross pollution prevention is suitable for tunnel engineering.

Description

technical field [0001] The invention relates to a tunnel structure for preventing air cross-contamination. Suitable for tunneling works. Background technique [0002] With the development of highway construction, the number of small clear distance tunnels and tunnel groups is increasing, and the problem of ventilation cross-contamination of adjacent tunnels is also gradually becoming prominent. For ultra-long tunnels with a small clear distance or multiple arches, the polluted air between the left and right openings is easy to flow; for tunnel groups, when the longitudinal distance between the upstream and downstream tunnel entrances is less than 100m, especially when the upstream Part of the polluted air discharged concentratedly at the outlet often enters the downstream tunnel in the form of wall-attached jet flow, increasing the background concentration of fresh air at the inlet of the downstream tunnel, thus bringing pollution to the downstream tunnel. Cross-contaminat...

AI Technical Summary

Problems solved by technology

For ultra-long tunnels with a small clear distance or multiple arches, the polluted air between the left and right openings is easy to flow; for tunnel groups, when the longitudinal distance between the upstream and downstream tunnel entrances is less than 100m, especially when the upstream Part of the polluted air discharged concentratedly at the outlet often enters the downstream tunnel in the form of wall-attached jet flow, increasing the background concentration of fresh air at the inlet of the downstream tunnel, thus bringing pollution to the downstream tunnel

Cross-contamination not only seriously affects the ventilation performance and efficiency of tunnels, but also produces a large amount of harmful gases in emergency situations such as fires, which will be detrimental to the escape safety of people in adjacent tunnels.

[0003] For the cross-flow problem of tunnels with small clear distance or multi-arch tunnels, the code recommends to set up a partition wall or plant tall trees between the two openings, and the longitudinal distance between the left and right openings should not be less than 10m, but the engineering applicability is poor

For tunnel groups, the code requires that the mutual influence of opening spacing on ventilation should be analyzed in the ventilation design, but no clear engineering suggestions are provided

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