Protection method for rock fall in deep excavation road cutting

Abstract

The invention discloses a protection method and a protection device for blocking deep cutting falling rocks. The protection method for blocking the deep cutting falling rocks includes the steps: excavating earth rocks for a plurality of longitudinally and uniformly arranged anchored pile bodies constructed on a falling rock bearing side of a cutting and supporting excavated hole walls; pouring anchored piles; excavating the cutting after the anchored piles achieve design strength; and mounting a breast board between each two adjacent anchored piles after the cutting is excavated and forming pile-sheet retaining walls by the breast boards and the anchored piles. In the protection method, the reinforced concrete anchored piles are firstly constructed on the falling rock bearing side of the deep cutting, a slope is closed by the aid of the reinforced concrete pile-sheet retaining walls formed by the anchored piles and the breast boards, accordingly, earth rock excavation engineering is decreased, slope stability is enhanced, and the capacity of bearing the impact force of perilous falling rocks is also enhanced. Therefore, by the protection method, the cutting can be supported and retained in deep excavation, the perilous falling rocks can be blocked, and the protection method has the advantages of high safety, economy, practicability and convenience in construction.

Description

technical field [0001] The invention relates to the field of railway and highway subgrade construction, in particular to a method and device for protecting a deep excavation square cutting from falling stones. Background technique [0002] Subgrade is the main component of railways and highways, and the stability of subgrade directly affects driving safety. The roadbed and cutting slopes are exposed to the air all the year round, directly accepting the baptism of nature, and at the same time bearing various additional forces from the operation of trains or vehicles. In order to ensure the stability of the subgrade and the safe operation of trains or vehicles, it is necessary to ensure the stability of the cutting slope of the subgrade, and at the same time prevent natural disasters such as dangerous rocks falling from the natural slope at the top of the cutting. Therefore, during the construction of the subgrade, it is necessary to Reinforce and protect the natural slope on...

AI Technical Summary

Problems solved by technology

[0004] However, for the rockfall natural disasters existing in the natural slope at the top of the existing deep excavation cutting, the current reinforcement and protection measures have the following disadvantages due to the limitations of natural conditions such as the site, specifically: the construction of the existing deep excavation cutting needs to be carried out first. Excavation at a certain engineering depth makes the earthwork excavation project larger, artificially increasing the height of the slope, which is not conducive to the stability of the slope; and the higher the artificial slope, some natural plant barriers and gentle slope platforms that are conducive to rockfall protection The more damage is suffered, the more likely the source of dangerous rock falling on the top of the cutting will directly cause disasters to the subgrade engineering.

At the same time, because the excavation of the deep excavation and the protective measures are carried out separately, the production cost is also relatively high

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