Three-dimensional multi-defense-line double-raft damping structure suitable for nuclear power stations in soft soil areas

Abstract

The invention discloses a three-dimensional multi-defense-line double-raft damping structure suitable for nuclear power stations in soft soil areas. The structure comprises piles, gravel damping cushion layers arranged on the upper surfaces of the piles, lower rafts arranged on the gravel damping cushion layers; underground shear walls are arranged around the lower rafts; upper rafts are mounted in middles of the lower rafts through a set of three-dimensional damping devices and eddy current damping devices arranged at intervals; the upper rafts are provided with nuclear power station double-layer safety shell structures and annex structures; the nuclear power station double-layer safety shell structures are positioned in middles of the annex structures; the eddy current damping devices are arranged between the underground shear walls and the side walls of the annex structures; and upper cover plates are arranged between the tops of the underground shear walls and the annex structures.The structure is provided with three damping defense lines: the damping gravel cushion layers, three-way damping layers between double rafts, and inner and outer safety shell damping layers, so thatthe pile top stress can be improved, the transfer of earthquake force to upper structures is reduced, and the transfer of upper structure inertia force to foundations is reduced.

Description

Technical field:

[0001] The invention belongs to the technical field of nuclear power plant foundations, and relates to a three-dimensional multi-defense double-raft shock-isolation structure suitable for nuclear power plants in soft soil areas, specifically a combination of double-layer rafts, a new three-dimensional shock-isolation system, and a new composite shock-isolation pile foundation . Background technique:

[0002] Based on the clean and low-carbon characteristics of nuclear power energy, it has been favored by more and more countries. The safety of nuclear power plants is the top priority in the construction of nuclear power plants. The latest generation of nuclear power plants adopts a double-layer containment structure. After investigation, the important buildings (structures) related to nuclear safety in my country's nuclear power plants all use raft foundations, with hard rock as the bearing layer. The shear wave velocity of the rock mass is relatively high, ...

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