A structure and construction method of improving the tunnel lining shock absorption capacity

Abstract

The invention discloses a structure for improving the shock resistance and shock absorption capacity of a tunnel lining and a construction method, and belongs to the technical field of construction of mountain tunnels and underground engineering. The structure comprises a primary support closely attached to surrounding rock and a secondary lining located on the inner side of the primary support. Annular absorbing joints are arranged on the primary support in the longitudinal depth direction of a tunnel at equal intervals. Construction joints reserved during secondary lining construction with a lining trolley are arranged on the secondary lining in the longitudinal depth direction of the tunnel at equal intervals. The annular absorbing joints are filled with concrete containing rubber particles, the construction joints are filled with an asphaltic sand mixing material, and the annular absorbing joints and the construction joints are distributed in a staggered mode. The structure for improving the shock resistance and shock absorption capacity of the tunnel lining and the construction method have the advantages that construction efficiency is high, cost is low and no new seams need to be added.

Description

technical field [0001] The invention relates to a structure and a construction method for improving the anti-seismic and shock-absorbing capacity of tunnel lining, which belongs to the technical field of mountain tunnel and underground engineering construction, and is particularly aimed at traffic tunnel projects in Wenchuan, Yushu and other high-intensity and strong-earthquake regions. Background technique [0002] When the tunnel passes through the weak surrounding rock, if the construction is improper, it is easy to cause lining cracking, water seepage, primary branch invasion and even landslide accidents. After the landslide accident, the landslide body should be cleaned up in time, the collapse cavity should be backfilled, and the backfill body should be grouted and reinforced. However, no matter what backfilling method, backfilling material, grouting material and grouting amount are adopted, the strength, stiffness, joints, occurrence and other parameters of the surrou...

AI Technical Summary

Problems solved by technology

However, no matter what backfilling method, backfilling material, grouting material and grouting amount are adopted, the strength, stiffness, joints, occurrence and other parameters of the surrounding rock in the collapse cavity cannot be restored to the original state of the surrounding rock, which also caused the surrounding rock The earthquake inertial force at the rock defect position increases, and the internal force of the support structure increases, and then the lining cracks, falls quickly, and even the lining collapses.

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