Small-section long-distance soft rock tunnel construction method

Abstract

The invention belongs to the field of infrastructure engineering technology construction, and relates to a small-section long-distance soft rock tunnel construction method. According to the method, the excavation technology for the small-section long-distance soft rock tunnel is summarized; in the construction process, the ventilation, smoke exhaust and water drainage methods of the tunnel are studied; a primary support section form is designed according to the type of tunnel surrounding rock; and through the research on the difficulty in concrete transportation and warehousing strength in thetunnel lining construction since the surrounding rocks are divided into IV type and V type, the rocks are soft rocks and extremely soft rocks, and the tunnel construction is influenced by ''small'' and ''long'', the characteristics of the project and the requirements on the engineering construction technology and quality are combined, and the on-site construction process is improved and optimized, so that the safe and efficient construction purpose is gradually achieved.

Description

technical field [0001] The invention belongs to the construction field of infrastructure engineering technology, and relates to a construction method for a small-section long-distance soft rock tunnel. Background technique [0002] In recent years, many soft rock tunnels have been built at home and abroad. However, due to the long lines, many faults, high external water, and complicated hydrogeological conditions, it is difficult to clarify the preliminary geological survey work, and the current design theory at home and abroad is still not perfect. , it is necessary to use various theories and methods for analysis and calculation, combined with experience, engineering analogy, etc. to carry out comprehensive analysis and research for pre-design, and during the construction period, the on-site design and construction geological catalog personnel will combine the actual excavation geological conditions and safety monitoring and other data to conduct surrounding rock analysis. ...

AI Technical Summary

Problems solved by technology

First, the principles and selection methods of waterproofing and drainage are not uniform. Compared with foreign countries, the existing design specifications and standards for waterproofing and drainage are not clear, which brings difficulties in the implementation of technical measures for waterproofing and drainage;

[0005] The selection of ventilation and dust removal methods for roadheader tunnel construction generally adopts two types: press-in type and mixed type. The advantage of the press-in type ventilation and dust removal scheme is that it can quickly eliminate the dirty air on the working face. The disadvantage is that the dirty air flows through the entire tunnel , so it is generally only suitable for tunnels with shorter distances

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