Method for processing tunnel collapse caused by shallow-buried excavation

Abstract

The invention relates to a method for processing tunnel collapse caused by shallow-buried excavation. The method comprises the first step of clearing soil bodies at the collapse part to a primary excavation line, the second step of carrying out secondary excavation according to the borderline of a secondary excavation line, constructing arch foot channel steel underboardings and upper half primary supports and then backfilling a vault to a soil body backfilling line, the third step of carrying out inside-tunnel construction by adopting the benching stepping method, the fourth step of constructing lower half primary supports and closing the lower half primary supports into rings by adopting the alternative bay method, and the fifth step of carrying out secondary lining construction on inverted arches at the bottom of a tunnel and then carrying out secondary lining construction on the upper portion of the tunnel by adopting lining trolleys. Through the combination of design construction and construction steps of the design construction, the method for processing the tunnel collapse caused by the shallow-buried excavation is completed. Therefore, the good effects that engineering investments are saved, and the construction period of the tunnel and safety in construction are guaranteed are achieved.

Description

technical field [0001] The invention relates to the field of construction engineering, in particular to a method for treating the collapse of a shallow buried tunnel. Background technique [0002] At present, the characteristics of the safety problem of shallow buried tunnel collapse have attracted the attention of the industry. In order to ensure the safety of the project, the open cut method is generally used for construction. If the site conditions are simple, the slope excavation method with the most economical project cost can be selected for construction; but When the site conditions are limited, it is necessary to choose vertical enclosures such as underground diaphragm walls and bored piles according to the buried depth of the tunnel project. In addition, the construction of the internal support structure type construction, the construction cost of the project is high, and the construction period is difficult to guarantee. Contents of the invention [0003] In orde...

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Problems solved by technology

[0002] At present, the characteristics of the safety problem of shallow buried tunnel collapse have attracted the attention of the industry. In order to ensure the safety of the project, the open cut method is generally used for construction. If the site conditions are simple, the slope excavation method with the most economical project cost can be selected for construction; but When the site conditions are limited, it is necessary to choose vertical enclosures such as underground diaphragm walls and bored piles according to the buried depth of the tunnel project, coupled with the construction of the internal support structure, the construction cost of the construction plan is high, and the construction period is difficult to guarantee

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