Construction method of shallow-buried and underground excavated large-section tunnel in tailings slag fill area

Abstract

The invention discloses a construction method of a shallow-buried excavation type large cross section of tunnel in a tail slag filling area. The construction method comprises performing sleeve valve pipe grouting reinforcement on the slag filling on the ground according to the construction survey lofting reinforcement range; performing side slope and upward slope cutting and elevation on the tunnel to be excavated on the ground earthwork and performing construction of cover arch foundation piles at the position of a hole of the tunnel to be excavated; performing pre-stressed anchor cable reinforcement on a side slope and an upward slope and performing cover arch and large pipe shed construction on the cover-arch foundation piles; performing funnel hole body excavation by a double-side-wall vertical pilot heading excavation method; performing initial supporting construction and anchor spray concrete construction on a hole body of the tunnel after the excavation on the hole body of the tunnel is achieved; performing waterproof layer construction and secondary lining construction on the hole body of the tunnel; performing clay backfill above the hole body of the tunnel under the ground elevation is restored. According to the construction method of the shallow-buried excavation type large cross section of tunnel in the tail slag filling area, the funnel hole body excavation is performed by the double-side-wall vertical pilot heading excavation method due to the shallow-buried excavation and large cross section characteristics of the tail slag filling area and accordingly the tunnel excavation difficulty is reduced and the construction quality is ensured.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for shallow-buried and underground excavation of large-section tunnels in tailings slag filling areas. Background technique [0002] With the development of my country's economy and the expansion of infrastructure construction, tunnel engineering has become an important project in large-scale projects such as roads, railways, and municipal projects; however, due to the limitations of the surrounding environment and geological conditions; or in order to better meet the growing traffic Traffic flow, traffic conditions; or in order to pursue the open effect of large space, there are more and more tunnels in the form of shallow buried tunnels with large cross-sections, but due to large spans and complex geological conditions, there is still a lack of mature experience in China, and relevant standards and norms have limited reference , especially in com...

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Problems solved by technology

[0002] With the development of my country's economy and the expansion of infrastructure construction, tunnel engineering has become an important project in large-scale projects such as roads, railways, and municipal projects; however, due to the limitations of the surrounding environment and geological conditions; or in order to better meet the growing traffic Traffic flow, traffic conditions; or in order to pursue the open effect of large space, there are more and more tunnels in the form of shallow buried tunnels with large cross-sections, but due to large spans and complex geological conditions, there is still a lack of mature experience in China, and relevant standards and norms have limited reference , especially in complex geological conditions and surrounding environments, it is more difficult to build super-large cross-section tunnels

[0003] Especially for tailings slag filling areas, due to defects such as loose slag body, low cohesion, low shear strength, and poor self-stabilization ability, collapse is very easy to occur, and because the excavation section of the tunnel is relatively high, and the buried depth of the vault is relatively high. Shallow, the surrounding environment space is narrow, and the formwork trolley cannot be used for the second lining construction

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