A kind of expansion force test device for the face of mud-water balance shield tunnel in expansive soil area

Abstract

The present invention is an expansion force test device for the face of a mud-water balance shield tunnel in an expansive soil area, comprising a main frame, a shield machine simulation device, a measurement system and a slurry circulation system, and the main frame includes a model box, a movable plate and a hydraulic jack; The shield machine simulation device includes a circular pressurized column and a hydraulic tie rod; the measurement system includes an earth pressure gauge, a pore water pressure gauge and a data acquisition instrument; the slurry circulation system includes a slurry tank, a mud pump, a pressure gauge, and a hose. The hydraulic jack applies axial load to the test expansive soil, the circular pressurized column simulates the shield machine, the circulating slurry applies muddy water pressure to the test face, and the data acquisition instrument is used to collect and record the soil pressure and pore water of each measurement point of the test expansive soil pressure data. The invention can accurately measure the expansion force and expansion range of the face of the mud-water balance shield tunnel, makes up for the shortcomings of existing methods, and can provide swelling performance parameters of the mud-water balance shield tunnel expansive soil for related fields such as engineering geology and tunnel engineering.

Description

technical field [0001] The invention belongs to the technical fields of geological engineering and tunnel engineering, and in particular relates to an expansion force test device for the face of a mud-water balance shield tunnel in an expansive soil area. Background technique [0002] In 1938, the U.S. Bureau of Reclamation first discovered the problem of expansive soil in a steel siphon project, which subsequently attracted widespread attention. By the 1960s, the problem of expansive soils had received extensive attention and related researches developed rapidly. Especially when it comes to mud-water balance shield tunnels, during the shutdown process of the shield machine, it is necessary to use the grout to continuously apply loads to the tunnel face to ensure the stability of the tunnel face. During this process, the slurry penetrates into the soil near the tunnel face, and the expansive soil absorbs water. Afterwards, the expansion deformation occurs, and the expansion...

AI Technical Summary

Problems solved by technology

Most of the previous studies used on-site monitoring methods. However, due to the complex on-site environment and many interference factors, it is often impossible to obtain real and effective expansion force and expansion range.

To sum up, there is currently no test device capable of testing the expansion force of the face of mud-water balance shield tunnels in expansive soil areas.

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