Novel water stopping structure for tunneling seam in permafrost region

Abstract

A novel water stopping structure for a tunneling seam in a permafrost region is characterized in that the water stopping structure in the circumferential direction is arranged in an engineering seam of a secondary tunnel lining and annularly laid in secondary lining die construction concrete; the novel water stopping structure is an inflatable water stropping strap and provided with a water flowing groove structure, and the water flowing groove faces towards an inner side cold-proof heat-preserving layer; the inflatable water stopping strap is made of soft materials; the water stopping strap is inflated till the outer wall of the water stopping strap is totally attached to the inner wall of a secondary lining concrete groove; the lower end of the inflatable water stopping strap is connected with a gutter of a skewback of a tunnel. In the tunnel construction and operation period, when the temperature of surrounding rock rises and frozen soil thaws, underground water will naturally flow down along the water stopping strap, enter the gutter of the tunnel and be drained out of the tunnel, and therefore it is avoided that the underground water seeps into the tunnel along the secondary lining engineering seam, and cold damage caused by freeze of the underground water is avoided.

Description

technical field [0001] The invention relates to the field of tunnel waterproofing, in particular to a novel water-stop structure applied to tunnel engineering joints in permafrost regions. Background technique [0002] my country is the third largest permafrost country in the world after Russia and Canada. With the rapid development of engineering construction in permafrost areas, more and more tunnel projects are under construction or proposed in permafrost areas. The waterproof and drainage technology in the process of tunnel construction in permafrost regions is the key technology to ensure the safe operation of tunnels. At present, a considerable part of the tunnel projects that have been built in permafrost areas in our country have suffered from freezing damage caused by the failure of drainage systems, which seriously threatens the stability of tunnels and traffic safety. [0003] After excavation of tunnels in permafrost regions, the original hydrothermal balance sy...

AI Technical Summary

Problems solved by technology

[0006] Among them, the tunnel drainage system in the permafrost area will cause groundwater to freeze due to the decrease in permafrost temperature due to the increase in service life, making it lose its drainage capacity; on the other hand, the main part of the drainage system is mostly laid behind the primary lining of the tunnel. The effect of dealing with permafrost meltwater infiltration is not ideal

For all kinds of water-stop structures, most of them have the problem of poor water-stop effect caused by construction quality problems; at the same time, there are durability problems caused by the aging of water-stop materials

Images