Advanced support structure for shallow buried and dark excavated tunnel in water-rich miscellaneous fill area and construction method

Abstract

The present invention relates to an advanced support structure for a shallow buried and dark excavated tunnel in a water-rich miscellaneous fill area and a construction method, belongs to the field oftunnel construction, and aims to solve the problems of looseness, settlement and instability of the miscellaneous fill structure caused by tunnel excavation, and to ensure the safety and economy of tunnel construction. The advance support structure comprises a cave body advance support structure and a ground surface reinforcement structure; the cave body advance support structure comprises a small grouting guide pipe and an advanced large pipe shed that penetrates along the longitudinal direction of a tunnel; and the ground surface reinforcement structure is arranged in a surrounding rock above the advanced large pipe shed. The construction method comprises the following steps of first, construction of jet grouting piles and water-stop curtains; second, construction of the full line of advanced large pipe sheds; and third, construction of small guide pipes in sections and excavation of the tunnel. The advanced support structure effectively avoids the instability problems such as the loosening and settlement of the miscellaneous fill structure caused by the tunnel construction through the combined action of the ground surface reinforcement structure, the full-line advanced large pipe sheds and the small grouting guide pipes, and improves the safety in construction period and operation period of the miscellaneous fill tunnel.

Description

technical field [0001] The invention belongs to the field of tunnel construction, and in particular relates to an advanced support structure and a construction method for a shallow-buried tunnel in a water-rich miscellaneous fill area. Background technique [0002] With the development of modern urban underground rail transit, more and more urban tunnels will be built in the miscellaneous filling soil layers such as burying garbage and other sundries. Due to the underconsolidation, low bearing capacity, high compressibility, poor collapsibility and poor uniformity of the miscellaneous fill, if unreasonable excavation methods are used for tunnel excavation, it is easy to cause engineering disasters such as stratum instability or large deformation question. [0003] And when the buried depth of the tunnel is relatively shallow, the ground subsidence and deformation caused by the loss of the strata during the construction process are relatively large, and accidents such as roo...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an advanced support structure and construction method for shallow buried tunnels in water-rich miscellaneous fill areas to solve the problems of loose settlement and instability of miscellaneous fill structures caused by tunnel excavation, and to ensure that such Safety and economy in tunnel construction

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