Application of High-pressure Grouting Foundation Treatment Based on Increasing Shear Velocity in Taishan Nuclear Power Plant
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Abstract
To meet nuclear safety criteria and have an anti-seismic function, buildings in a nuclear power plant should locate on bed rocks or rocks with a shear wave velocity greater than 400m/s. Foundation treatment is needed if the rock does not meet the above condition. Through an introduction on the foundation treatment of the liquid waste hold up tanks building in Taishan Nuclear Power Plant, comparison and analysis on the advantages and disadvantages of two methods are made in this article, namely excavation and backfill by plain concrete method and jet-grouting method. Practice has proven that under certain condition, jet-grouting method could efficiently increase the shear wave velocity. By adopting this method, slope excavation and retaining can be avoided, thus with a smaller constructive safety risk and a relatively lower cost. This method is fully fit for foundation with thick backfilled soil layer.
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