A Construction Technology of Reserved Central Rock Pillar in Super-long-span Dome of Underground Nuclear Reactor Cavern

A technology for nuclear reactor and construction technology, applied in underground chambers, mining equipment, earth-moving drilling, etc., can solve problems such as improper construction technology, safety accidents, and quality control, and achieve convenient construction, improve safety, and reduce surrounding rock. Effects of Stress Levels and Deformation Levels

Active Publication Date: 2016-06-15
CHANGJIANG SURVEY PLANNING DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If the excavation of the super-long-span dome of the underground nuclear reactor cavern is improperly constructed, it is easy to cause delays in the construction period, loss of quality control, increased investment, and even safety accidents in severe cases

Method used

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  • A Construction Technology of Reserved Central Rock Pillar in Super-long-span Dome of Underground Nuclear Reactor Cavern
  • A Construction Technology of Reserved Central Rock Pillar in Super-long-span Dome of Underground Nuclear Reactor Cavern
  • A Construction Technology of Reserved Central Rock Pillar in Super-long-span Dome of Underground Nuclear Reactor Cavern

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The super-long-span dome of the underground nuclear reactor cavern has an excavation diameter of 48m and a height of 13.4m. The excavation process of the reserved central rock pillar is as follows: reserve the central rock pillar 2 in the center of the dome, first open up the construction channel 1 with a radius to the central pillar, then expand the left and right sides symmetrically in a fan shape, and finally start from the top. And excavate central rock pillar 2 down.

[0028] The reserved central rock pillar 2 of the dome is a circle with better stress conditions, and the cross-section is 12m in diameter. By establishing a three-dimensional numerical model to simulate the excavation process of the reserved central rock pillar method, and setting monitoring points on the exposed rock surface for tracking and monitoring, the results show that the deformation of the surrounding rock during the step-by-step construction meets the safety requirements. After step-by-ste...

Embodiment 2

[0033] The large-span dome of the surge shaft of the hydropower station has an excavation diameter of 41m and a height of 10.0m. The excavation process of the reserved central rock pillar is as follows: reserve the central rock pillar 2 in the center of the dome, first open the construction channel 1 from the radius to the central pillar, then expand the left and right sides symmetrically in a fan shape, and finally start from the top. And excavate central rock pillar 2 down.

[0034] The cross-section of the central rock pillar 2 reserved in the dome is 8m in diameter, which is a circle with good stress conditions.

[0035] During the entire excavation process, the support and monitoring of key control key parts such as the middle part of the temporarily expanded excavation face 4, the middle part of the reserved central rock pillar 2, and the arch foot 6 of the dome contour are emphasized.

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Abstract

The invention relates to a construction process for the central rock column reserved in the ultra-large-span dome of an underground nuclear reactor cavern, comprising the following steps: (1), reserving the central rock column at the center of the dome; (2), opening the construction along the radius of the spherical surface where the dome is located When the channel reaches the central rock pillar, support its excavation exposed surface and strengthen the support in the middle of the excavated exposed surface; (3) Excavate fan-shaped symmetrical excavations along the left and right sides of the construction channel to strengthen the temporary support in the middle of the tunnel face Supporting the exposed dome profile rock surface and strengthening the support of the dome profile arch foot; (4) After the expansion and excavation is completed, the central rock pillar is excavated from top to bottom. The invention is applicable to the construction of all large-span domes, especially suitable for the excavation of super-long-span domes in caverns of underground nuclear reactors, and has the technical advantages of simple excavation procedures, convenient construction, safety and reliability.

Description

technical field [0001] The invention belongs to the technical field of nuclear power engineering, and relates to the development and construction of nuclear power plants, in particular to a construction process for a super-large-span dome reserved central rock pillar in an underground nuclear reactor cavern. Background technique [0002] In my country's "Twelfth Five-Year Plan" energy plan, it is proposed to accelerate the construction of nuclear power. Under the influence of the Fukushima nuclear accident in Japan, the nuclear power industry, which had just emerged from the shadow of Chernobyl, fell into a trough again. The state's examination and approval of nuclear power projects is more stringent and prudent, and the safety requirements for nuclear power plants are higher. Therefore, a new type of underground nuclear power plant that puts all or part of the nuclear island underground will provide a new way for the development of nuclear power. [0003] The caverns of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D13/00
Inventor 杨启贵周述达苏利军刘百兴刘立新张治军李锋赵峰朱学贤李德
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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