Large model testing device for simulating asymmetric small-distance tunnel excavation process

Abstract

The invention discloses a large model testing device for simulating an asymmetric small-distance tunnel excavation process. The large model testing device comprises a model tank, a loading and controlsystem, an excavation simulation system and a data monitoring system; the outer wall of the model tank is spliced with steel structure loading plates; adjacent loading plates are connected to form awhole body through high-strength bolts and are externally provided with supports; the tank body can realize loading of the upper part and the side edges in three directions, and the pressure is provided through a hydraulic oil source system and a loading actuator; the upper part of the tank body is provided with a loading top beam, and the two side edges of the tank body are provided with counterforce walls respectively, so that the loading process is realized through multiple loading actuators and connecting rods; and sands are filled in the model tank as a stratum condition, and two internalair bag-support structures simulate an asymmetric small-interval tunnel. The large model testing device provided by the invention provides more comprehensive cognition to a surrounding rock pressurechange and a stratum deformation mechanism in the asymmetric small-interval tunnel excavation process by controlling the size of the loading force to simulate the excavation working conditions of thesmall-interval tunnel under the conditions with different burial depths and different lateral pressures.

Description

technical field [0001] The invention belongs to the technical field of geotechnical and underground engineering tests, and specifically relates to a large-scale model test device for simulating the excavation process of an asymmetric small-space tunnel, which can be used to simulate the excavation of an asymmetric small-space tunnel The law of surrounding rock pressure and stratum displacement during the process can provide reference for the optimization of tunnel design and construction scheme. Background technique [0002] With the large-scale development of urban underground space, a large number of small-space tunnel projects have emerged, some of which are multi-line parallel small-space tunnel groups, and some are even structurally asymmetric. However, the small clear distance tunnel has the characteristics of complex structural stress, various construction procedures, surrounding rock stress changes and frequent support load changes, which poses great challenges to tu...

AI Technical Summary

Problems solved by technology

[0007] The present invention utilizes the self-designed test device capable of simulating the excavation process of the asymmetric small-space tunnel in the uniform stratum, and can obtain the change law of the surrounding rock pressure and the stratum deformation law during the excavation process of the small-space tunnel, and mainly solves the following technical problems : (1) Easy installation and operation of the analog box

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