Method of treating lining after collapse of underground cavern crown

Abstract

The invention discloses a method of treating a lining after collapse of an underground cavern crown, relates to the field of underground cavern construction, and provides a method of treating the lining after collapse of the underground cavern crown, with low workload, low cost and effective collapse prevention. The method includes the steps of a, clearing collapse waste in the cavern; b, inserting at least one reinforcing anchor bar into the residual collapse waste and surrounding rock on two sides of the residual collapse waste, and allowing one end of each reinforcing anchor bar, close to the cavern, to be located in the same cross section; c, connecting an arch beam matching with the cross section of the cavern crown in shape to all reinforcing anchor bars, and attaching the arch beam to the cavern crown; d, subjecting the residual collapse waste to systematic consolidation grouting; and e, repeating the steps from a to d until the collapse waste in the cavern is fully cleared. The method is applicable to repairing collapsed underground caverns.

Description

technical field [0001] The invention relates to the field of underground cavern construction, and in particular designs a lining treatment structure for underground caverns after the roof arch collapses. Background technique [0002] In industries such as mines, hydropower, railways, and national defense, it is often necessary to arrange large underground caverns (groups) buried deep in the bedrock. Based on "Rock Mechanics" and engineering examples, these caverns all use circular arches with different radians. The span is generally from 20m to 32m, especially in national defense projects. Due to the complex conditions of the underground surrounding rock and numerous unknown unfavorable geological factors, the excavation support scheme obtained by using various calculation models and comprehensive engineering experience still cannot completely avoid the collapse during the excavation of the cavern. Once a landslide occurs, it will inevitably cause heavy losses and have a si...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages. First, the workload of slag removal after the landslide is large. Not only must all the slag material of the landslide be removed, but also the mouth of the landslide must be reinforced to prevent the landslide from expanding further. The construction is difficult and safe construction is difficult to control; secondly, the concrete arch The pouring conditions of the ring are poor, the engineering volume is huge, and the physical and mechanical properties of the reinforced concrete structure and the surrounding rock are quite different, so there is a big risk whether the arch effect can be formed and well consolidated with the surrounding rock of the collapse; Although partial filling avoids the phenomenon of "arch on arch", that is, avoids the risk of continued collapse, it usually increases the load of the lower concrete arch ring, and at the same time, the amount of grouting is huge

Therefore, the traditional "concrete backfill" processing method has a large room for improvement in terms of construction safety, construction period and investment

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