Advanced curtain grouting construction method applied to high-pressure and water-rich karst tunnel

Abstract

The invention discloses an advanced curtain grouting construction method applied to a high-pressure and water-rich karst tunnel. The advanced curtain grouting construction method applied to the high-pressure and water-rich karst tunnel includes the steps of advanced geological prediction, construction at two ends of a wall for grouting, drilling by a drilling rig, grout preparation, grouting during combination and detecting whether single hole grouting standards are met or not, if not, grout continues to be injected into a grouting hole, detection is conducted again until the requirements aremet, then whether grouting standards of a whole section are met or not is detected, if not, the grout is filled, and after the standards are met, the next stage of advanced curtain grouting construction is carried out. According to the advanced curtain grouting construction method applied to the high pressure and water-rich karst tunnel, the occurrence rate of water inrush is low, the constructionprocess is simple, the construction period is short, and the construction scheme is safer and more reliable.

Description

technical field [0001] The invention relates to the technical field of tunnel construction methods, in particular to an advanced curtain grouting construction method suitable for high-pressure water-rich karst tunnels. Background technique [0002] The distribution of karst areas in my country is very extensive, reaching nearly 3.4 million square kilometers, making it the country with the widest distribution of karst areas in the world. With the high-speed construction of major infrastructure projects such as transportation, water conservancy and hydropower in my country, more and more engineering facilities are gradually transferred underground and built in karst areas. At present, in terms of tunnel engineering, my country has become one of the countries with the largest construction scale and difficulty in the world. In the construction of many large, long and deep tunnels, they are faced with problems such as slow excavation, difficult support, and high maintenance costs...

AI Technical Summary

Problems solved by technology

[0003] During the construction of high-pressure water-rich karst tunnels, when there are soft rocks, water-rich, filled karst caves and other unfavorable geology in front of the tunnel face, excavation is carried out directly, which is prone to geological disasters such as landslides, water inrush and mud inrush. Grouting is a key issue to ensure the safe construction of tunnels. The current advanced curtain grouting construction has problems such as high technical requirements for grouting, complicated construction technology, long construction period, and high cost.

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