关键词: 穹顶, 预留中心柱, 预留岩墙, 分步施工, 施工模拟, 地下核反应堆

Abstract:

Aiming to the prominent problem of large dome construction difficulty of nuclear reactor in underground nuclear power plants, we respectively give two construction solutions of the reserved central pillar and the reserved rock wall, and establish a three-dimensional analysis models for the step-by-step construction of the two methods based on three-dimensional simulation platform of Midas. The simulation results show that the displacements caused by the two methods all meet the engineering safety requirements, and the maximum displacement caused by the construction of reserved rock wall method would be larger than the ones caused by the reserved central pillar method, and it also has caused more obvious displacement on the top of the dome than the reserved central pillar method. The construction of reserved central pillar method would cause more obvious displacement at the middle part of the reserved central pillar and on the excavation face. For the two construction schemes, the construction quality and monitoring measures should be strengthen for the exposed area of the dome, the middle part of the reserved central pillar and the excavation face to ensure the construction safety.

Key words: dome, reserved central pillar, reserved rock wall, step-by-step construction, construction simulation, underground nuclear reactor