后注浆超长钻孔灌注桩抗压承载力试验研究
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（1 天津市建筑设计院，天津 300074；2 天津大学建筑设计院，天津 300072）［摘要］以天津地区某在建超高层的桩基静载试验为基础，对软土地区后注浆超长钻孔灌注桩的承载性能进行了研究。结果表明：软土地区的超长钻孔灌注桩为纯摩擦桩；超长钻孔灌注桩桩侧摩阻力和桩端阻力的发挥是不同步的，桩侧摩阻力的发挥先于桩端阻力；超长钻孔灌注桩的桩顶沉降量很大，应采用桩顶沉降量来确定其极限承载力；超长钻孔灌注桩存在有效桩长，其长径比不超过80是比较合理的。［关键词］超长钻孔灌注桩; 静载荷试验; 单桩极限承载力中图分类号：TU473.1+4 文献标识码：A 文章编号：1002-848X(2014)22-0086-04Experimental research on compression bearing capacity of super-long bored pile with post-groutingYang Jinxi1, Ding Yongjun2(1 Tianjin Architecture Design Group, Tianjin 300074, China; 2 Tianjin University Architecture Design Group, Tianjin 300072, China)Abstract: Based on the static loading tests of the pile foundation of a super high-rise building in Tianjin, the bearing capacity characteristics of super-long bored pile with post-grouting in soft soil areas were studied. Results show that the super-long bored pile with post-grouting is pure friction piles in soft soil area. The lateral friction resistance and the bottom resistance of the super-long pile with post-grouting display asynchronously, and the former resistance displays at the first. The settlement of the pile toe of the super-long pile with post grouting is very large, so the settlement of pile top should be used to design the ultimate bearing capacity. The super-long pile has effective pile length and pile lengthdiameter ratio is reasonable under 80.Keywords: super-long bored pile with post-grouting; static loading test; ultimately bearing capacity of single pile作者简介：杨进喜，硕士，工程师，Email:yangjinxi119@126.com。参考文献［1］高飞. 上海地区超长后注浆钻孔桩竖向承载力试验研究［J］. 上海地质，2007(2): 45-48.［2］JGJ 94—2008建筑桩基技术规范［S］. 北京：中国建筑工业出版社，2008.［3］曹国峰,李亚明，蒋镇华. 大直径超长桩端后注浆钻孔灌注桩在宁波地区的应用［J］. 建筑结构，2011,41(S1):1240-1245.［4］程晔,龚维明,戴国亮，等. 超长大直径钻孔灌注桩桩端承载力研究［J］. 南京航空航天大学学报：自然科学版，2007,39(3): 407-411.
