Underground cavity extra-large dome excavating construction method

Abstract

The invention discloses an underground cavity extra-large dome excavating construction method. The underground cavity extra-large dome excavating construction method comprises the following steps: first, a dome cavity and a guiding cavity connected with the dome cavity are vertically layered; second, the dome cavity is symmetrically divided into a plurality of areas with the guiding cavity as an axis; third, an upper layer of guiding cavity is excavated and supported, each area is symmetrically excavated with the vertical axis of the dome cavity as an axis in a stagger mode and is gradually away from the vertical axis, and after a single area is excavated, systematic supporting is conducted on a top arch of the dome cavity according to design requirements; and fourth, a lower layer of guiding cavity is excavated and supported, each area is symmetrically excavated with the vertical axis of the dome cavity as an axis in a stagger mode and is gradually away from the vertical axis, and after a single area is excavated, systematic supporting is conducted on a top arch of the dome cavity according to design requirements; and due to the adoption of the steps mentioned above, excavating construction of the extra-large dome of an underground cavity is safely and high efficiently achieved. The simultaneous construction method of layering, area dividing and left-right diagonal staggered area ensures construction quality and construction safety, and meanwhile greatly improves work efficiency and reduces engineering construction cost.

Description

technical field [0001] The invention relates to the field of excavation and construction of underground caverns, in particular to a construction method for excavating an extra-large dome of an underground cavern. Background technique [0002] In the underground cavern project, there is a dome type, that is, the underground cavern with a spherical curved surface, such as a surge tank of a hydropower station. For small and medium-sized dome-like caverns, the arch span (namely, the diameter of the dome) is usually less than 12m. For the dome position of a dome-type underground cavern, such as a dome with an arch span of more than 20 meters, if these construction methods are used, there will be narrow working space, large mutual interference between various processes, difficulty in controlling the charge amount of the blast hole, and easy deformation of the surrounding rock. Stability, extremely inconvenient construction operation, difficult to control the quality of top arch e...

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Problems solved by technology

However, when this method is used, the operating space is relatively narrow, which is not conducive to the use of large-scale construction facilities, such as drilling and blasting rigs, and when the arch span is large, such as 20m or even 30m, the height of the cavern dome is high, and the construction is not easy. Convenience, low work efficiency

[0004] "Shanxi Architecture" in January 2008, No. 3, pages 152-153, recorded "Blasting Construction of Shaft Shaft Dome of Mixing System on the Left Bank of Xiaowan Hydropower Station", which adopted a construction plan symmetrically divided into blocks by corridors. The existing problems are: , when the diameter of the cavern dome becomes larger, such as reaching 30 meters, the height of the cavern dome is higher at this time, the construction is more difficult, and the construction risk increases

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