A test device for frost heaving rate of soil around tunnels

Abstract

The utility model relates to a test device for frost heave rate of soil around a tunnel, which belongs to the field of geotechnical engineering. The fixing device is set inside the sample installation test system and is used for the test system. The liquid replenishment device replenishes water for the rock and soil test matrix of the sample installation test system and replenishes oil for the inner ring space of the rock and soil test matrix. The sample installation test The system is equipped with a refrigeration system for rapid cooling. The volume pressure control system is connected with the liquid replenishment device to control the pressure of the sample installation test system and measure the volume of liquid discharged from the middle of the rock and soil test matrix after frost heaving. The data acquisition device and the test The sample installation test system is connected to the volume pressure control system for data collection. The invention realizes the reasonable test of the frost heave deformation index of the soil around the circular tunnel by setting a reasonable thermal control device, and breaks through the deficiency of the frost heave rate tested by the current one-dimensional frost heave test in the frost heave design of the tunnel engineering.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a test device for simulating frost heave deformation of soil around a tunnel. Background technique [0002] In recent years. The scale and quantity of tunnel construction in my country's cold regions are increasing day by day. Tunnels built in cold regions suffer from frost damage to varying degrees, threatening the normal operation of the tunnels. After the construction of the tunnel in the cold region, the water-containing soil around the tunnel freezes and expands in winter, acting on the lining with frost-heaving force, which causes the lining concrete to crack and leak, which affects the safe operation of the tunnel, endangers the driving safety, and even affects the health and service of the tunnel. useful life. Therefore, in the design and construction of the project, it is necessary to consider the adverse effects of frost heave deformation of the so...

AI Technical Summary

Problems solved by technology

For tunnels in cold regions in homogeneous ground, the direction of heat flow is consistent with the normal direction of the tunnel lining, and the negative temperature continues to develop along the normal line of the lining to the surrounding soil. The freezing mode is similar to that simulated by the traditional one-dimensional freezing test. The one-dimensional freezing patterns of horizontal strata are significantly different, so it is unreasonable to apply the frost heave rate of soil based on one-dimensional frost heave test to the evaluation of frost damage of lining

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