Device for testing frost-heaving ratio of soil body around tunnel

Abstract

The invention discloses a device for testing the frost-heaving ratio of soil around a tunnel and belongs to the field of geotechnical engineering. The fixing device is arranged in a sample mounting and testing system and is used for the testing system, a liquid supplementing device is used for supplementing water for a rock-soil body testing base body of the sample mounting and testing system and supplementing oil for the middle space of an inner ring of the rock-soil body testing base body, and a refrigerating system for rapidly refrigerating the sample mounting and testing system is arranged in the sample mounting and testing system. A volume pressure control system is communicated with the liquid supplementing device to perform pressure control on the sample mounting and testing system and measure the volume of liquid discharged from the middle part of the rock-soil body testing matrix after frost heaving, and a data acquisition device is connected with the sample mounting and testing system and the volume pressure control system and is used for acquiring data. By arranging the reasonable thermal control device, the frost heaving deformation index of the soil body around the circular tunnel is reasonably tested, and the defect of the frost heaving rate tested by the current one-dimensional frost heave test in the anti-frost heaving design of tunnel engineering is overcome.

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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