Strata reinforcement system of shield tunneling in shallow overburden area and its construction method

Abstract

The invention relates to a shallow burial soil area shield driving stratum strengthening system and a construction method thereof. Tunneling under the condition of shallow burial soil can lead to disadvantages of unstability and collapse of a shield method tunnel cutting face, upheaval and settlement of earth surface and the like. Uplift piles which are arranged in rows are vertically arranged between a two-way shield tunnel and the two sides of the two-way shield tunnel, the tops of the uplift piles at the two sides are provided with rectangular ring beams, and a two-way multi-ribbed plate is arranged in each ring beam; each two-way multi-ribbed plate is composed of concrete front-panels and two-way multi-ribbed beams which are arranged on the bottom faces of the concrete front-panels, and the two-way multi-ribbed beams are distributed in a transverse and longitudinal crossed grid-shaped mode; the concrete front-panels and the two-way multi-ribbed beams adopt integral formwork erection, and one-time pouring forming is achieved; the ring beams are connected with the two-way multi-ribbed plates to form a whole through rebar connectors reserved in the inner sides of the ring beams. According to the shallow burial soil area shield driving stratum strengthening system and the construction method thereof, stratum upheaval and settlement deformation caused by shield driving pressure under the condition of shallow burial soil can be effectively blocked, the adverse impact on a running tunnel below ground caused by temporary overload on the ground after completion of work can be reduced, and normal driving for the shield tunnel in the shallow burial soil area can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a shield excavation stratum reinforcement system and a construction method in a shallow soil-covered area. Background technique [0002] For the current rail transit projects in major cities in China, shield tunnels account for an increasing proportion. For shield tunneling engineering, the thickness of tunnel covering soil is one of the important factors affecting the quality and safety of the project, which is determined by the construction principle of shield tunneling engineering. The minimum covering soil thickness of shield tunneling method is mainly based on the adverse impact of shield excavation on the surrounding environment and the safety of the project itself. Existing engineering experience and relevant regulations have clearly stated that the minimum covering soil thickness of shield tunneling method tunnels should generally not be less than d...

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Problems solved by technology

[0003] At present, when constructing shield tunnels under the condition of shallow overlying soil stratum, methods such as temporary ground pressure or stratum grouting reinforcement are generally used for treatment. Poor, it is easy to cause loosening and cracks in the stratum above the tunnel. In the case of insufficient stratum reinforcement, the deformation trend of stratum uplift cannot be avoided, and the stability of the stratum and the stability of the tunnel cannot be guaranteed when the shield tunnel is excavated under the condition of shallow overlying soil stratum. own safety

Under the condition of shallow overlying soil strata, the conventional temporary weighting or stratum grouting treatment cannot protect the tunnel in operation from the adverse effects of temporary ground load, which may lead to cracks and water leakage in the tunnel segment during operation, reducing the tunnel’s safety. Long-term durability and stability, but also unable to protect ground structures and residents from the adverse effects of train operation vibration and noise, it is difficult to meet the design requirements of the century-old project

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