Soft rock area surge chamber intersecting tunnel section collapse rapid treatment method

Abstract

The invention discloses a soft rock area surge chamber intersecting tunnel section collapse rapid treatment method. The method includes the main measures that a pre-buried steel pipe is arranged and serves as a ballast passing channel; rock ballast (or sand gravel) backfilling is performed on a collapse cavity area; shaft head locking of an intersection tunnel section (an upper chamber, a lower chamber and a diversion tunnel) intersecting with a surge chamber is performed through reinforced concrete annular beams; and grouting treatment and the like of the backfill rock ballast (sand gravel) of the position, outside a surge chamber designed excavation line, of the collapse cavity area are performed. According to the soft rock area surge chamber intersecting tunnel section collapse rapid treatment method, materials such as I-steel and steel plates are used, and the annular shaft head locking beams can maintain the stability of the rock wall of the intersection of the surge chamber; the backfill rock ballast (sand gravel) can serve as a construction platform, and moreover the stability of the rock wall of a collapse cavity is facilitated; and grouting treatment of the rock ballast (sand gravel) is performed on the collapse cavity, the effects are good, the construction cost is low, and the construction period is short.

Description

technical field [0001] The invention relates to a method for treating landslides in soft rock areas, in particular to a method for rapidly handling landslides at intersecting cave sections of surge chambers in soft rock areas. Background technique [0002] In the long-distance tunnel-type pressure water diversion system, in order to reduce the water hammer pressure of the high-pressure pipeline and meet the requirements of the unit adjustment guarantee calculation, a surge chamber is often built on the pressure water diversion pipeline. Cylindrical surge chamber (that is, shaft) + upper and lower water chambers, simple in structure, unchanged in section size and shape, and good in reflecting water shock waves, is the most widely used form of surge chamber. However, the water level of the surge chamber in this form fluctuates greatly and the attenuation is slow. Therefore, the volume of the shaft needs to be large, resulting in a large diameter and depth. During the excavati...

AI Technical Summary

Problems solved by technology

However, the water level of this type of surge chamber fluctuates greatly and the attenuation is slow. Therefore, the volume of the shaft needs to be large, resulting in a large diameter and depth.

During the shaft excavation process, if the cavern crossing is complicated and the rock conditions are poor, the surrounding rocks are prone to collapse, threatening the construction safety and affecting the construction progress

[0003] The conventional treatment methods are generally: (1) Consolidation grouting is carried out on the collapsed parts. Since the collapsed parts are often severely weathered, the grouting time of this treatment method is long and the construction period is long, otherwise the construction conditions cannot be met; In the damaged part, the grouting pressure is small, the grouting effect is not ideal, and the landslide treatment is difficult to achieve the engineering effect; (2) the landslide section is sealed with concrete, which has a small safety risk, but the amount of backfilling concrete is large and the cost is high, and Large volume concrete backfill requires a long construction period, which affects the construction progress

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