Heat-resistant lining structure of tunnel with high ground temperature

Abstract

The invention relates to a heat-resistant lining structure of a tunnel with high ground temperature. According to the invention, the carrying capacity of a tunnel lining structure is ensured not to be reduced in the high ground temperature environment, the heat-resistant or heat-proof performance is good, the cracking of the tunnel lining due to the temperature stress can be effectively avoided and the durability of the tunnel lining structure can be ensured. The lining structure comprises a wall rock (10), an initial support (11) and a secondary liner (20), wherein the initial support (11) covers the surface of the wall rock (10); the secondary liner (20) is built in the initial support (11); the initial support (11) is formed from injecting ceramsite concrete; a heat-insulating layer and a drainage-proof heat-insulating composite layer (40) are arranged in the initial support (11); and the heat-insulating layer is formed from die-building ceramsite concrete.

Description

technical field [0001] The invention relates to a tunnel lining structure, in particular to a heat-resistant and heat-proof lining structure for tunnels in high ground temperature or areas with high ground heat. Background technique [0002] With the promotion of the western development, in order to further develop the economy of the old, young, frontier and poor areas of our country, and strengthen cultural exchanges with minority areas, my country's railway traffic projects are rapidly developing in the western and other mountainous areas with difficult terrain. Restricted by terrain conditions, a large number of deep-buried long and extra-long tunnels have emerged in railway engineering, especially in recent years in the western region, there have been new cases where tunnel projects need to cross high ground temperature anomalies. [0003] There are three main reasons for the high ground temperature: one is the continuous rise of the ground temperature caused by the incr...

AI Technical Summary

Problems solved by technology

[0004] When the tunnel project passes through the high geothermal anomaly zone, the initial temperature of the surrounding rock is relatively high, and its maximum temperature can reach about 100°C. The lining structure system is placed in a high-temperature environment, and the hydration heat of the lining concrete during the maintenance stage is not easy to dissipate, which is not conducive to The normal condensation of concrete can easily lead to the decrease of the mechanical properties of the lining structure, which cannot play the role of supporting load; Cause cracks and cracks in the lining structure, reduce the bearing capacity of the structure, affect the durability of the structure, and make the tunnel structure unable to meet the service life of 100 years

In addition, if reasonable technical measures are not taken to block or reduce the transmission of geothermal heat, the operating environment of the tunnel will inevitably be deteriorated, and the ambient temperature during the operation stage of the tunnel will rise, which is extremely unfavorable for daily maintenance and repair operations of personnel and the maintenance of related equipment in the tunnel. Normal operation will pose a great threat to the sustainable operation of the tunnel

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