Lining structure for super large section water-rich loess tunnel of high-speed railroad

Abstract

The invention discloses a lining structure for a super large section water-rich loess tunnel of a high-speed railroad, aiming at effectively controlling the post-construction sedimentation of a tunnel structure and maintaining long-term stability. The lining structure comprises an outer lining (10) and an inner lining (20), wherein, the outer lining (10) comprises an arch crown section (11), an archwall section (12) and an inverted arch section (13) which seal loess wall rock; and the arch springing part (11a) of the arch crown section (11) is transversely widened, an arch crown steel frame (11b) which is extended in a circumferential direction is embedded in the arch springing part (11a), and the arch crown steel frame (11b) is anchored on the loess wall rock by a locking anchor bar (11c). The invention has the advantages of solving the technical problems of the construction of the super large section water-rich loess tunnel under the condition of water-rich loess geology, and can effectively control the post-construction sedimentation of the tunnel structure and maintain long-term stability; proved by the field shock excitation test simulating the running of high-speed train, the accumulated sedimentation of the filling surface of the inverted arch in the tunnel is not higher than 0.5mm after the 20 years running of the high-speed train.

Description

technical field [0001] The invention relates to a high-speed railway, in particular to a lining structure for a super-large-section water-rich loess tunnel of the high-speed railway. Background technique [0002] In recent years, my country has built a large number of road and railway tunnels in the loess area, some of which have relatively high soil water content, such as the Xinsongshuwan Tunnel on the Baolan Second Line and the Daonan Tunnel of the Huangyan Expressway. Accumulated some experience. However, these loess tunnels that have been built do not have high requirements for structural subsidence during the operation period. The initial support system composed of ordinary shotcrete anchor nets and steel frames is used. The focus is on ensuring the safety of the construction process, and less attention is paid to the tunnel. The problem of structural subsidence in the operation stage after construction is completed. In fact, in the past, road and railway loess tunnel...

AI Technical Summary

Problems solved by technology

This state will cause excessive settlement of the initial support, which will adversely affect the construction and safety of the tunnel, and it is difficult to meet the strict requirements of the high-speed railway on the post-construction settlement, deformation and long-term stability of the offline structure.

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