Method for dismantling three-rock-pillar support of huge-span underground cave depot

Abstract

The invention discloses a method for dismantling three-rock-pillar support of a huge-span underground cave depot. The method comprises the following steps that step 1, an area is divided, specifically, a working surface of a to-be-excavated underground cavern is divided into an upper cavern area and a lower cavern area, the upper cavern area is divided into three areas in the left-right direction, and the area, located at the left edge or the right edge, of the upper cavern area is a side cavern area; the areas, adjacent to the middle area of the upper cavern and the area left cavern area or the right cavern area, are rock pillar areas; and the area, between every two adjacent rock pillar sections, is a cave area; and step 2, excavation construction is carried out, specifically, excavation is carried out in the tunnel excavation direction, the distance of a single-time excavation section is determined, the cavern area and the cavern hole areas are excavated in sequence, and excavation of the single-time excavation section is completed; each rock pillar area is divided into a plurality of sequentially adjacent small rock pillars in the tunnel excavation direction; and the excavated sections of the excavated cavern areas and the excavated sections of the excavated side cavern areas serve as construction channels of all the to-be-excavated rock pillar areas in the sections. The stability and safety of the huge-span underground cave depot in the rock pillar dismantling process can be guaranteed, and meanwhile, the purpose of quickly dismantling the rock pillar can be achieved through the method.

Description

technical field [0001] The invention belongs to the technical field of engineering construction, and in particular relates to a method for removing the support of three rock pillars in a huge-span underground cavern. Background technique [0002] In the field of underground engineering, giant-span underground engineering appears in various industries. For giant-span underground projects, according to the current design and construction technology, the maximum excavation diameter of underground caverns is about 20m. During the excavation process, as the span of the underground cavern continues to increase, corresponding measures need to be taken during the process. One way is to continuously increase the support strength of the primary support and the secondary lining, and at the same time increase the beam-column structure , to achieve the effect of reducing the span of the cavern, but the increased beams and columns affect the spatial layout of the cavern and affect the us...

AI Technical Summary

Problems solved by technology

During the excavation process, as the span of the underground cavern continues to increase, corresponding measures need to be taken during the process. One way is to continuously increase the support strength of the primary support and the secondary lining, and at the same time increase the beam-column structure , to achieve the effect of reducing the span of the cavern, but the increased beams and columns affect the spatial layout of the cavern and affect the use effect

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