Testing device for analyzing stress of slurry balance shield tunnel pipe piece in swelling soil area

Abstract

The invention discloses a testing device for analyzing the stress of a slurry balance shield tunnel pipe piece in a swelling soil area. The testing device is characterized by comprising a main frame, a measurement system and a water adding system, the main frame comprises a model casing, a movable plate, a hydraulic jack and testing pipe pieces, the measurement system comprises a soil pressure gauge, a pore water pressure gauge, a strain gauge and a data acquisition instrument, and the water adding system comprises a peristaltic pump, a hose and capillary tubes. The hydraulic jack exerts an axial load on testing swelling soil, and the water adding system evenly delivers water to the testing pipe pieces and a testing swelling soil contact belt at a stable speed through the capillary tubes. The data acquisition instrument is used for acquiring and recording the data of soil pressure of all measurement points of the swelling soil, pore water pressure and pipe piece deformation. By the adoption of the testing device, the swelling force borne by the slurry balance shield tunnel pipe piece and the swelling range of the swelling soil can be accurately measured, the defects of existing methods are overcome, and swelling performance parameters of slurry balance shield tunnel swelling soil can be provided for the relevant fields such as the engineering geology field and the tunnel engineering field.

Description

technical field [0001] The invention belongs to the technical fields of geological engineering and tunnel engineering, and in particular relates to a force analysis test device for mud-water balance shield tunnel segments in expansive soil areas. 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, after the segment is installed, the residual slurry and groundwater continue to infiltrate into the surrounding soil of the tunnel, and the expansive soil expands and deforms after absorbing water, and generates expansion force under the constraints of the segment and the surrounding soil. Most of the previous studies used on-site monitoring methods. However, du...

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 a true and effective analysis of the expansion force on the segment and the expansion range of the expansive soil.

To sum up, there is currently no test device that can test the force of the mud-water balance shield tunnel segment in the expansive soil area.

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