A tunnel lining structure against freezing and thawing disasters in high-altitude cold regions

Abstract

The invention discloses a tunnel lining structure for resisting freezing-thawing disasters in a high-altitude cold region. A two-section structure is adopted in a second lining of each tunnel, a gap is left between the two sections for installing spring group members, the spring group members are sequentially and alternately arranged on the top, the left side wall and the right side wall of the second lining in the length direction of the tunnels. The spring group members comprise end steel backing plates, embedded steel bars, springs and steel wire ropes. The two opposite end steel backing plates are arranged in the disconnection gap of the second lining of each tunnel. The end steel backing plates are welded and fixed through the embedded steel bars, and the springs are installed betweenthe two end steel backing plates in a hooking mode. Arc-shaped protrusions are separately adopted in the left and right side wall feet of the second lining of the each tunnel and are inserted into arc-shaped grooves at corresponding ends of an inverted arch of the each tunnel to realize rotatable connection. The structure can adapt to the freezing-thawing expansion and contraction of water vaporat the interface between a permeable surrounding rock and a tunnel lining structure, removes repetitive loading and forced deforming generated on the tunnel lining structure, and thoroughly solve thefreezing-thawing disaster problem of the tunnel lining structure in the high-altitude cold region.

Description

technical field [0001] The invention relates to a tunnel lining structure suitable for anti-freezing and thawing disasters in high-altitude cold regions, in particular to solve the problem of tunnel lining structure caused by repeated freezing-thawing expansion and contraction deformation during the seepage process of surrounding rock groundwater in the water-rich tunnel section of tunnels in high-altitude cold regions. In view of the disaster problems caused by extrusion or tensile cracking, a lining structure is designed that can resist the extrusion stress or shrinkage stress caused by the freezing and thawing of surrounding rock seepage. This structure can avoid the freezing and thawing of the lining structure in the water-rich tunnel section Squeeze or tension rupture disaster. Background technique [0002] The development and construction of transportation infrastructure and hydropower resources in the west of my country, especially in the southwest region, has entered...

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Problems solved by technology

[0004] For the freeze-thaw disasters of tunnel lining structures in high-altitude areas, although the measures of drainage, thermal insulation or heating antifreeze can solve the simple freeze-thaw problem to a certain extent, they still face the following problems: (1) Adopt drainage measures It can solve the problem of centralized water gushing and concentrated water seepage, but it is difficult to completely solve the load damage effect of distributed water seepage and underground and atmospheric water vapor freezing on the tunnel structure; (2) adopting thermal insulation and antifreezing measures can partially solve the tunnel when the air temperature and ground temperature are near zero degrees Celsius However, it is difficult to solve the problem of freezing disasters in tunnel lining structures under conditions of extremely low temperature and low ground temperature; The distance is long and the cost is high, and it is difficult to guarantee the use of solar heating due to rainy days and nights. At this time, the temperature and ground temperature are low and it is difficult to realize

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