Nuclear island negative excavation ring corridor presplit blasting method

Abstract

The invention relates to a nuclear island negative excavation circle corridor pre-split blasting method, belonging to the technical field of earthwork construction methods. The method has the following steps: excavating downward at the elevation at the heart of the nuclear island, and reserving a retaining layer; drilling holes along the inner and outer circumferences of the circle corridor at equal space interval respectively; filling flexible material into the bottom of the holes to serve as cushion layers; filling the explosive into the holes which are provided with the cushion layers and the loading depth at the orifices in three sections, wherein, the bottom part is a strengthening explosive filling section, the top part is a weakening explosive filling section, and the middle part is a normal explosive filling section; after the explosives are loaded into the holes, filling the loading depth at the orifices with conventional materials; and detonating the explosives to form cracks along the inner and outer circumferences of the circle corridor. The invention can form desired cracks along the inner and outer circumferences of the circle corridor at the predetermined location of the rock foundation so as to carry out the main bursting aiming to remove the rocks in the circle corridor; at the same time, taking into account the vibration, tolerance and other technical requirements, the invention takes corresponding reasonable measures so as to rapidly complete the construction work of the nuclear island negative excavation circle corridor 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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