Open cut tunnel structure of simply supported arch of tunnel traversing huge karst cave and construction method thereof

Abstract

The invention relates to the field of karst tunnels, in particular to an open cut tunnel structure of a simply supported arch of a tunnel traversing a huge karst cave and a construction method thereof. The structure comprises a U-shaped substrate, an arch part simply supported arch, a vault backfill body and a bridge beam plate. The tops of two sides of the U-shaped substrate are in contact with upper surrounding rocks, a slot I is formed in one side of the inner wall of the U-shaped substrate, and a slot II is formed in the other side of the U-shaped substrate; the vault backfill body fills aspace among the upper surrounding rocks of the arch part simply supported arch; a side substrate I and a side substrate II are separately arranged on two sides of the arch part simply supported arch;the side substrate I is placed in the slot I and can shift vertically and transversely in the slot I; the side substrate II is placed in the slot II and can shift vertically and transversely in the slot II; and the bridge beam plate is placed in a space encircled by the arch part simply supported arch and the U-shaped substrate, and two ends of the bridge beam plate are located on stable foundations at two ends of the karst cave. The construction method is used to construct the structure. The open cut tunnel structure achieves dynamic and static separation and can avoid excessive structural settlement caused by dynamic and static load coupling.

Description

technical field [0001] The invention relates to the field of karst tunnel engineering, in particular to a simply supported arch open tunnel structure and a construction method of a tunnel passing through a giant karst cave. Background technique [0002] After entering the 21st century, my country's railway construction has developed rapidly. As my country's railway construction further radiates to the southwest region, the corresponding railway tunnels account for an increasing proportion of the total line length. Due to high railway design standards, fast speed, and large turning radius, tunnel construction will inevitably pass through karst areas in the western mountainous area where carbonates are widely distributed. [0003] When the tunnel passes through the area where the karst caves are strongly developed, due to the more complex hydrogeological and engineering geological conditions, more geological defects have brought a great impact on the tunnel construction. At p...

AI Technical Summary

Problems solved by technology

For tunnels passing through giant karst caves, the backfilling scheme has problems such as difficult control of post-construction settlement and large amount of backfilling; when using piled raft structures or bridges to span, the structure bears the coupling effect of dynamic and static loads such as train cycle loads and surrounding rock loads. High safety risks and complex design will bring great difficulties to structural construction and maintenance during operation

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