Physical model test device and method for ground fissure earth tunnel

Abstract

The invention discloses a physical model test device for ground fissure earth tunnels comprising a model box in a model device. A footwall soil mass and a hanging wall soil mass are symmetrically arranged by a vertical shaft in the model box, a simulation ground fissure is arranged between the footwall soil mass and the hanging wall soil mass, a fixed bottom plate is installed below the footwall soil mass, and a hanging wall soil mass supporting plate in a sedimentation device is installed below the hanging wall soil mass; an air pressure sac is arranged among an upper cover, the footwall soil mass and the hanging wall soil mass; a tunnel portal is horizontally arranged on the cylindrical side wall of the model box, the axial line of the tunnel portal is perpendicular to the vertical shaft of the model box, the tunnel portal is internally provided with a model tunnel lining structure, and various sensors are arranged. The invention also discloses a physical model test method for the ground fissure earth tunnels. Tests of various schemes, such as ground fissure trend variation, variations of wall rock soil mass stratum structures and mechanical properties, variations of lining structural forms, sections and rigidities, and the like are realized by utilizing the device. The device and the method of the invention are simple and have good accuracy.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and relates to a ground fissure soil tunnel physical model test device, and also relates to a ground fissure soil tunnel physical model test method. Background technique [0002] In the construction of cavern structures such as tunnels, complex geological conditions are often encountered, such as ground fissures, goafs, karst caves, and depressions, etc., especially those formed and developed based on the development of fault structures and the excessive exploitation of groundwater. Ground fissures seriously affect the stability of the tunnel lining structure. Specifically, after the upper and lower wall strata on both sides of the ground fissure are dislocated, the subsidence displacement of the tunnel lining structure in the stratum and the soil on both sides of the ground fissure is different, which may cause The lining structure is separated from the surrounding rock; at the same t...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a physical model test device for ground fissure soil tunnels, which solves the problems of single simulation working conditions, unreasonable simulation of tunnel surrounding rock stress field, and large internal measurement error in existing three-dimensional model test devices

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