Test device and method for simulating ground access type shield tunnel excavation

Abstract

The invention provides a test device and method for simulating ground access type shield tunnel excavation, and the test device comprises a model test groove, a shield segment model, a tunnel excavation device, a transmission system, an adjustable support system, a starting pedestal, a synchronous grouting system, and a monitoring quantity control system. The tunnel excavation device is composed of a steel sleeve with a cutting edge at the front end, a rotary cutting tool and a steel partition plate, and the adjustable support system comprises a counterfort type support, a steel truss base, anL-shaped rotating plate, a rotating shaft and a jack. The ground access type shield tunnel excavation process with a certain slope rate is simulated through the synergistic effect of the adjustable support system and the transmission system in combination with a simple tunnel excavation device for the first time and is closer to engineering practice, test working condition combinations of different excavation slopes and grouting amounts are set, the segment structure mechanical property, the soil body stress release rule and the stratum deformation mechanism of the ground access type shield tunnel are studied, and design and construction guiding can be realized.

Description

technical field [0001] The invention relates to the technical field of indoor model tests of tunnel engineering, in particular to a test device and method for simulating excavation of a ground access type shield tunnel. Background technique [0002] The shield method has the advantages of small impact on the surrounding environment, high degree of automation, and fast construction progress. It has become the mainstream tunnel excavation construction method in my country and is widely used in urban rail transit projects, municipal tunnel projects, and underground pipeline projects. among. However, the traditional shield method requires open-cut construction of the working well and the connection tunnel on the shallow side of the soil, which not only has high manpower and material costs, but also solves a series of social problems such as ground traffic dispersal, building demolition, and underground pipeline relocation. . [0003] In recent years, with the continuous deepeni...

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Problems solved by technology

[0004] As far as the existing technical development level is concerned, the mechanical properties of the segment structure, the soil stress release law and the formation deformation mechanism during t

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