Pre-splitting Blasting Method of Negative Excavation Ring Corridor in Nuclear Island

Abstract

The invention relates to a pre-splitting blasting method for a nuclear island negative excavation ring gallery, and belongs to the technical field of earthwork construction methods. The steps of the method are: digging down at the selected location according to the elevation of the center of the nuclear island, and reserving a reserved layer; drilling holes at equal intervals along the inner and outer circumferences of the ring corridor; installing flexible materials at the bottom of the holes as a buffer Cushion layer; in the hole where the cushion layer is installed and the hole is left with a blockage depth, the charge is divided into three sections, the bottom is the reinforced charge section, the top is the weakened charge section, and the middle is the normal charge section; after the explosive is loaded , the orifice plugging depth is filled with conventional materials; detonation forms cracks along the inner and outer circumferences of the ring corridor. The invention can form ideal inner and outer circumferential cracks in the ring corridor at the predetermined position of the rock foundation, and then can carry out the main explosion for the purpose of removing the rock in the ring corridor. Therefore, the construction operation of the negative excavation ring corridor of the nuclear island can be completed quickly and with high quality.

Description

technical field [0001] The invention relates to a blasting construction method, in particular to a pre-splitting blasting method for a nuclear island negative excavation ring gallery, and belongs to the technical field of earthwork construction methods. Background technique [0002] In order to meet the rapid growth of my country's energy demand and maintain sustainable economic development, the country has determined the policy of "actively developing nuclear power". At present, my country's nuclear power installed capacity is 8.7 million kilowatts, which accounts for less than 2% of my country's total power generation installed capacity. According to the plan, to achieve the goal of nuclear power installed capacity by 2020, it means that in the next ten years, the construction of 2 to 3 million-kilowatt nuclear power units should be started every year. [0003] In the construction of nuclear power plants, the foundation of the nuclear island has tended to be standardized,...

AI Technical Summary

Problems solved by technology

[0006] It is difficult to meet the above requirements by using conventional blasting methods, so an effective blasting process is needed to meet the strict requirements of nuclear power for nuclear island negative digging blasting excavation

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