Testing device and method for simulating development process of crack induced by frost heaving of lining structure

Abstract

The invention discloses a test device and method for simulating a lining structure frost heaving induced crack development process, and belongs to the technical field of geotechnical engineering. The device can be suitable for simulating the frost heaving deformation of the tunnel lining structure crack in the cold region, and the frost heaving deformation degree of the tunnel lining structure crack in the cold region can be accurately measured. A tunnel lining is placed in the sample installation testing system, the fixing device is used for sealing the sample installation testing system, the pressure control system is used for controlling the pressure in the sample installation testing system and simulating external pressure and pore water pressure, and the refrigeration system is used for regulating and controlling the internal temperature of the sample installation testing system. And the external temperature borne by the actual lining structure is simulated. By arranging the reasonable refrigerating system, the frost heaving deformation degree of the cracks of the tunnel lining structure under the freezing and thawing cycle is achieved. The device can be used for exploring the development mechanism of the lining crack in different water thermal environments, and lays a foundation for developing related freeze injury treatment measures.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a test device and method for simulating the development process of cracks induced by frost heaving of a lining structure. Background technique [0002] In recent years, the scale and quantity of tunnel construction in cold regions of my country have been increasing day by day. Many tunnels built in cold regions suffer from frost damage to varying degrees, threatening the normal operation of the tunnels. For example, the Xiluoqi No. 2 Tunnel, Baikashan Tunnel, Basumu Tunnel, Guanjiao Tunnel, etc. have all experienced frost damage problems. Some scholars have made statistics on 122 tunnels in high latitude areas, of which 51 have frost damage; among 34 tunnels in high altitude areas, 15 have frost damage. It can be seen that the problem of frost damage is very common in tunnels in cold areas. Among the problems of freezing damage of tunnels in cold re...

AI Technical Summary

Problems solved by technology

After the cracks are formed, moisture in the soil around the lining cracks and even groundwater flow into the cracks. When the temperature drops in winter, the moisture in the existing cracks in the lining concrete will freeze and expand under pressure, which will further lead to the development of cracks. With the increase of freeze-thaw times, cracks will The scale has also continued to expand, and even formed through cracks, resulting in water leakage and icing in the lining, which seriously damaged the safety of the tunnel and even made the tunnel unable to operate

Images