Excavation support construction method for T-shaped crossing of underground chamber

Abstract

The invention relates to an excavation support construction method for a T-shaped crossing of an underground chamber, and aims at providing the excavation support construction method for the T-shapedcrossing of the underground chamber with the advantages of low cost, safety and reliability so as to reduce the construction difficulty and shorten the construction period. The method has the technical scheme that the excavation support construction method for the T-shaped crossing of the underground chamber is characterized by comprising the following steps of 1, excavating, supporting and constructing a crossing section of a branch chamber and a main chamber; 2, excavating and supporting a construction passage of the main chamber; and 3, excavating and supporting the main chamber. The methodprovided by the invention is applicable to water conservancy and hydropower engineering and geotechnical engineering.

Description

technical field [0001] The invention relates to a construction method for excavating and supporting a T-shaped intersection in an underground cavern. Suitable for water conservancy and hydropower engineering, geotechnical engineering. Background technique [0002] The "T"-shaped intersection project arranged in the unfavorable geological area without self-stability is greatly affected by groundwater, the construction span is large, the structure is complex, the stress is concentrated, the excavation is difficult, and the installation of the support structure takes a long time. It is difficult to closely combine the rock and the supporting structure to form an overall structure, and there are great construction difficulties and safety risks. If the rock pillars are reserved for excavation, due to the low strength of the surrounding rock mass, it is necessary to pour a large amount of concrete on site to form a temporary support; and most of the steel arches have different sh...

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Problems solved by technology

[0002] The "T"-shaped intersection project arranged in the unfavorable geological area without self-stability is greatly affected by groundwater, the construction span is large, the structure is complex, the stress is concentrated, the excavation is difficult, and the installation of the support structure takes a long time. It is difficult to closely combine the rock and the supporting structure to form an overall structure, and there are great construction difficulties and safety risks

If the rock pillars are reserved for excavation, due to the low strength of the surrounding rock mass, it is necessary to pour a large amount of concrete on site to form a temporary support; and most of the steel arches have different shapes, and it will be difficult to process and install the steel arches. Long problem; the effect of prestressed anchor cables in weak surrounding rock is difficult to guarantee

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