A method for pre-treatment of multiple water gushing points in tunnel section of underground rich water zone
A technology of water gushing point and rich water, applied in water conservancy projects, hydroelectric power generation, hydroelectric power stations, etc., can solve the problems of poor grouting effect, unable to form an anti-seepage circle, etc., and achieve the effect of simple on-site construction, good effect, and reduced difficulty.
Active Publication Date: 2019-01-01
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology
[0003] In the process of collecting water points, affected by the inrush water pressure (external pressure), the final grouting effect near one or two water points is poor, and an effective anti-seepage circle cannot be formed
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Embodiment Construction
[0012] like figure 1 As shown, this embodiment is based on the previous treatment of water gushing points, combined with the actual project to provide a method for the pre-treatment of multiple water gushing points in the tunnel section of the underground water-rich zone. # It has been applied in the pre-treatment of water gushing points in caves.
[0013] During the excavation process of the underground tunnel 1 in the water-rich zone, the groundwater will gushes out from multiple points. Long-term operation is safe, and the water gushing point is grouted. The specific construction method is as follows:
[0014] a. When a water gushing point appears during the excavation of the tunnel section in the water-rich zone of underground tunnel 1, the grouting treatment for tunnel section B in the water-rich zone should be carried out first to form an effective anti-seepage circle Ⅰ3-1, so that the external water is concentrated in the water-rich zone Cave section A gushes out;
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The invention relates to a pretreatment method of a plurality of water burst points in a water-enriched zone tunnel section. The pretreatment method aims at reducing the grouting difficulty of the water-enriched zone tunnel section, forming an effective anti-seepage ring, making no additional treatment nearby the water burst points, and providing a forceful foundation guarantee for post treatment on the water burst points. The water-enriched zone tunnel section is provided with a leakage passage and is provided with the water burst points. The pretreatment method comprises the following construction steps: a, when the water burst points appear in an excavation process of the water-enriched zone tunnel section, grouting treatment of a water-enriched zone tunnel section part B is carried out and an anti-seepage ring I is formed; b, a drainage pressure relief hole penetrating through the anti-seepage ring I and communicating with the leakage passage of the water-enriched zone tunnel section is punched in a bottom plate of the water-enriched zone tunnel section part B; c, grouting treatment of a water-enriched zone tunnel section part A is carried out and an anti-seepage ring II is formed, the whole water-enriched zone tunnel section forms a complete anti-seepage ring consisting of the anti-seepage ring I and the anti-seepage ring II; and d, finally, the drainage pressure relief hole is subjected to permanent plugging or pipeline drainage, or is provided with a check valve.
Description
technical field [0001] The invention relates to a method for pre-treatment of multiple water gushing points in a tunnel section of an underground rich water zone. Applicable to water conservancy and hydropower projects. Background technique [0002] In water conservancy and hydropower projects, underground tunnels, especially deep-buried tunnels, generally have well-developed groundwater. During excavation of tunnels in water-rich areas, groundwater will gushes out from multiple points. In order to ensure the stability of the surrounding rock of the cavern and the Long-term operation is safe, and the water gushing points are generally treated with grouting. The multiple water points in the water-rich zone are grouped into one or two water points in the order of the side arch first and the bottom plate, so that the water-rich zone forms an effective anti-seepage circle. , the last water point is drained or permanently blocked according to the specific situation. [0003] In...
Claims
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IPC IPC(8): E02B9/00E02B9/02
CPCE02B9/00E02B9/02Y02E10/20
Inventor 侯博纪昌知何江
Owner POWERCHINA HUADONG ENG COPORATION LTD