振冲碎石桩处理严重液化地基的应用研究  

Application Research on Vibroflotation Gravel Pile to Treating Severe Liquefaction Foundation

作　　者：冀健红 姜璇 刁慧贤 JI Jianhong;JIANG Xuan;DIAO Huixian(Henan Vocational College of Water Conservancy and Environment,Zhengzhou 450008,China;Henan Electric Power Design and Survey Institute CO.LTD.,Zhengzhou 450007,China)

机构地区：[1]河南水利与环境职业学院,河南郑州450008 [2]中国电建集团河南省电力勘测设计院有限公司,河南郑州450007

出　　处：《河南水利与南水北调》2022年第4期73-74,77,共3页Henan Water Resources & South-to-North Water Diversion

摘　　要：应用振冲碎石桩复合地基处理缅甸高地震烈度区的严重液化地基,并应用规范法和功效当量标贯法对其进行液化判别,其设计思路、液化判定及工程经验对类似工程具有一定的技术参考价值。根据实际工程地质条件,拟定振冲碎石桩复合地基试桩方案,采用规范法和功效当量标贯法综合液化判别,确定合理的工程桩设计参数,并进一步对工程桩地基液化判别,判定其液化处理成效。结果表明,振冲碎石桩复合地基存在最佳桩间距;桩端距软弱土层应有足够的安全距离;规范法的液化判别结果不合理,需结合其他方法进行综合判定;与小范围试桩相比,大面积工程桩的桩间土挤密效果显著提高。The severe liquefaction foundation in high seismic intensity area of Myanmar is treated by vibroflotation gravel pile composite foundation, and the liquefaction discrimination is carried out by standard method and efficiency equivalent standard method.The design idea, liquefaction determination and engineering experience have certain technical reference value for similar projects.According to the actual engineering geological conditions, the test pile scheme of vibroflotation gravel pile composite foundation is proposed, and the reasonable engineering pile design parameters are determined by the standard method and the efficiency equivalent standard penetration method, and further the liquefaction discrimination of engineering pile foundation is made to judge the effect of liquefaction treatment. The results show that the optimal pile spacing exists in vibroflotation gravel pile composite foundation. There should be enough safe distance between pile tip and soft soil layer. The result of standard method is not reasonable, so it should be combined with other methods to make a comprehensive judgment. Compared with small scale test pile, the soil compaction effect of large scale engineering pile is significantly improved.

关 键 词：振冲碎石桩 液化判别 功效当量标贯法 严重液化地基 

分 类 号：TU475.1[建筑科学—结构工程]