Fault-passing tunnel excavation simulating experimental device

Abstract

The invention provides a fault-passing tunnel excavation simulating experimental device. Short steel plates hinged in pairs are used for simulating nonuniform surrounding rock pressure caused by bulk density difference or elevation difference of a surrounding rock. The hinged short steel plates can transfer a shearing force but not transfer a bending moment, so that the possibility of producing shearing damage due to sudden pressure change is avoided while the nonuniform surrounding rock pressure is simulated; through a gauze, the thickness and the dip angle of a fault can be flexibly controlled, so that an actual fault model is accorded better, and especially in a loose and soft fault, the simulating effect is more obvious; horseshoe-shaped soft rubber pads at the two ends of a tunnel lining model not only can prevent a surrounding rock material from entering the tunnel, but also can prevent occurrence of a phenomenon that the tunnel lining model is damaged or tempered glass is cracked due to concentrated stress caused by direct contact between a tunnel structure and the tempered glass on the front and back sides under the action of a pressure. The fault-passing tunnel excavation simulating experimental device can research quantitative influence of the geological fault on the tunnel by controlling a single variable.

Description

technical field [0001] The invention relates to the technical field of tunnel tests, in particular to an excavation simulation experiment device for tunnels crossing faults. Background technique [0002] When tunnels cross faults, engineering problems such as landslides, large deformations, and water and mud inrush are prone to occur, which will greatly increase the difficulty and cost of the project, and even cause safety accidents. Carrying out model tests to study construction mechanics, surrounding rock failure law and surrounding rock stability of fault fracture zone can effectively prevent or deal with such disasters. [0003] In the prior art, the application number 201610004012.0 applied by Southwest Jiaotong University in 2016 is a displacement synchronization control device and test method for simulating tunnels crossing active faults. It discloses that the device is composed of a model test box without a cover. The box is composed of a fixed right half box. The l...

AI Technical Summary

Problems solved by technology

[0004]However, the existing simulation experiments of tunnel excavation through fault models are too simple in terms of tunnel burial depth, fault thickness, fault dip angle, and the angle between the fault and the tunnel axis. , it is impossible to accurately control the variables, and then study the quantitative relationship between the tunnel stability and various factors. The measured results often have deviations that are difficult to adjust in practical applications, and are not representative, so it is difficult to flexibly adapt to the changing actual engineering geology. Condition

Images