珊瑚礁砂地基无填料振冲密实加固工艺分析  

Analysis on vibro-compaction technique for reinforcement of coral sand foundation

作　　者：徐雄 梁小丛[2] 冯振周 毕金华 XU Xiong;LIANG Xiao-cong;FENG Zhen-zhou;BI Jin-hua(The Second Engineering Company of CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510230,China;CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]中交四航局第二工程有限公司,广东广州510230 [2]中交四航工程研究院有限公司,广东广州510000

出　　处：《水运工程》2022年第6期215-220,共6页Port & Waterway Engineering

摘　　要：珊瑚礁砂是一种广泛分布于“一带一路”沿岸各个国家的特殊岩土材料,由于其易破碎、变形大、高压缩性的工程特性,其地基处理所适用的工艺与最终加固效果也与普通的陆源砂存在一定差异。依托实际工程,对吹填珊瑚礁砂地基进行多种不同工艺参数的无填料振冲试验。结果表明,对于珊瑚礁砂表层增加反插和提高留振时间工艺,可有效提高桩间土密实度;而对于底部中密珊瑚礁砂层,如须进一步提高加固效果,应使振冲点间距≤3 m;对于高细粒含量松散珊瑚礁砂层,增加反插和提高留振时间工艺能有效提高桩间土密实度,但在此基础上进一步减少振冲间距不能明显提升最终的加固效果。Coral sand is a special kind of geotechnical material widely distributed in countries participating in the Belt and Road Initiative.Due to its engineering characteristics of breakability,large deformation and high compressibility,the applicable technology and final reinforcement effect of the foundation treatment are different from those for the ordinary terrestrial sand to some extent.In an actual project,we carry out vibro-compaction tests to investigate the various technological parameters of filling the coral sand foundation.The results show that for the surface of coral sand,reverse insertion and vibration time increase can effectively improve the soil compactness between piles.Regarding the bottom medium-density coral sand layer,if the reinforcement effect needs to be further improved,the distance between vibro-compaction points should be reduced to less than or equal to 3 m.For the loose coral sand layer with high-content fine particles,the optimized process of reverse insertion and vibration time increase can effectively improve the soil compactness between piles,but further reducing the distance between vibro-compaction points on this basis cannot significantly improve the final reinforcement effect.

关 键 词：珊瑚礁砂地基 无填料振冲 加固工艺 

分 类 号：TU472[建筑科学—结构工程] U655.54[建筑科学—土工工程]