The Huaneng Xiapu Nuclear Power Plant is a typical nuclear plant built on offshore island,and it is necessary to fully consider the impact of transportation conditions,engineering geology,earthwork balance and residual settlement on land reclamation.Based on the characteristics and constraints of the site,three land reclamation and foundation treatment plans were proposed,including regular surcharging with prefabricated vertical drains(Option 1),combination of surcharging with two stages of prefabricated vertical drains installed at different levels to consolidate upper soft soil and stone columns installed in deep-seated under-consolidated cohesive layers with low area replacement ratio(Option 2),and blasting replacement of soft soil(Option 3).Critical issues including decreasing of discharge capacity of prefabricated vertical drains due to large deformation of soft soil,contribution of deep-seated compressible cohesive layers to long term settlement,and impact of reclamation fill on pile foundation construction were solved.For Option 2,the residual settlement at reclamation area is less than 0.5 m,and is most favorable for pile foundation construction.Although the cost of Option 2 is the highest,the comprehensive benefits are the best,so Option 2 is recommended for land reclamation in the project.
关键词
海岛/核电厂/陆域形成/塑料排水板/土石方平衡
Key words
offshore island/nuclear power plant/land reclamation/prefabricated vertical drains/earthwork balance
维普
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