注浆在桩土共用受力基础中的现场试验研究  

Field test study of post-grouting in pile-soil shared force foundation

作　　者：张志昊 ZHANG Zhihao(Zhangzhou City Investment Construction Group Co.,Ltd.,Zhangzhou 363000)

机构地区：[1]漳州城投建工集团有限公司,福建漳州363000

出　　处：《福建建筑》2024年第4期114-117,共4页Fujian Architecture & Construction

摘　　要：为了研究后注浆对强风化岩层中钻孔灌注桩承载性状的影响规律,对厦门市某超高层建筑的3根直径为1200 mm的钻孔灌注桩进行自平衡静载试验。通过对比,分析了未注浆桩与后注浆桩的承载与变形特性,发现散体状和碎裂状强风化岩层经后注浆技术处理后,岩层抗压承载能力得到提升,基桩承载力亦得到大幅度提升。并将试桩静载测试数据与现行规范及地勘报告中的推荐值进行对比,发现本工程强风化花岗岩层中后注浆桩侧摩阻力增强系数β_(si)达到2.24~2.77,较规范推荐值1.4~1.8,提升了约52.6%。To study the influence of post-grouting on the bearing behavior of bored pile in strongly weathered rock formations,the self-balanced static load tests were conducted on three bored piles with a diameter of 1200 mm in super high-rise buildings in Xiamen.By comparing and analyzing the bearing and deformation characteristics of ungrouted piles and post-grouted piles,it is found that the compressive bearing capacity of granular and cataclastic strongly weathered rock strara and the bearing capacity of pile are improved greatly after the post-grouting treatment.The obtained static load test data of test pile were compared with the current specifications of recommended values in the geological survey report,and it is found that the side friction enhancement coefficient b si of the post-grouted pile in the strongly weathered rock reaches 2.24~2.77,which is about 52.6% higher than that recommended value 1.4~1.8 in the code.

关 键 词：钻孔灌注桩 后注浆 竖向承载力 静载试验 增强系数 

分 类 号：TU4[建筑科学—土工工程]