Excavation test device for variable cross section tunnel and test excavation method thereof

Abstract

The invention relates to the field of laboratory simulation in the construction process of underground engineering, in particular to an excavation test device for a variable cross section tunnel and atest excavation method thereof. The excavation test device is characterized in that a tool of the excavation test device is located at the front end of a machine body; one end of a rotor is connectedwith the tool, and the other end of the rotor is connected with a spiral soil outlet pipe; the tool and the spiral soil outlet pipe are driven by the rotor to work together; the spiral soil outlet pipe is arranged in the machine body, four grouting devices are uniformly arranged at the front end of the machine body, and a hydraulic pusher is arranged at the rear end of the machine body; and the tool comprises blades and spring buttons, wherein the blades are connected with the spring buttons, the spring buttons can control the blades to be folded, and various initial excavation diameters canbe realized through the angles of rotating and folding the blades. According to the excavation test device for the variable cross section tunnel, the problem of continuous excavation of the variable cross section tunnel is solved, and the stability of a surrounding rock in the excavation process can be ensured; and the excavation test device has important significance for researching problems of the surrounding soil deformation and the ground surface settlement caused by the variable cross section tunnel excavation.

Description

technical field [0001] The invention relates to the laboratory simulation field of the underground engineering construction process, in particular to an excavation test device and a test excavation method for variable-section tunnels. Background technique [0002] With the continuous development of tunnel engineering technology, in order to adapt to various extreme conditions and inspired by the concept of green environmental protection, various new tunnels emerge in endlessly. For example, energy tunnels have become the research objects of many scholars because of their environmental protection advantages such as making full use of geothermal temperature. In order to adapt to the design concept of new tunnels, new tunnel forms that change the size of the tunnel section came into being. How to realize variable cross-section excavation is of great significance to the study of surrounding soil deformation and surface settlement caused by variable cross-section tunnel excavatio...

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Problems solved by technology

[0003] The research methods related to tunnel excavation mainly include empirical method, model test method, numerical simulation method, etc. Among them, the model test method is the most intuitive. However, there are few studies on the excavation process of variable cross-section tunnels. To ensure the continuity of the excavation process and the stability of the surrounding rock when changing the cross-section size, how to solve this problem becomes the key to the model test research of the variable cross-section tunnel excavation process

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