（1 中国铁路设计集团有限公司， 天津 300308；2 北京市建设工程质量第六检测所有限公司， 北京 100076）

［摘要］抗拔载体桩通过将纵向钢筋伸入载体内，在抗拔受力时可充分发挥载体的锚固作用，显著提高其抗拔承载力。对抗拔载体桩的抗拔承载机理进行理论分析，并结合一实际工程进行了抗拔载体桩的单桩和群桩抗拔静载试验，研究其单桩受力和群桩受力时单桩的相互影响。研究结果表明，抗拔载体桩单桩承载力较相同尺寸的普通直杆桩有较大提高。对试验结果进行分析，提出了适合抗拔载体桩单桩抗拔承载力的计算公式，并通过对国内多个项目进行比对，验证了其可行性。

［关键词］抗拔载体桩； 单桩；群桩；抗拔承载力；等效直径；三击贯入度

中图分类号：TU473-1文献标识码：A文章编号：1002-848X(2021)06-0135-04

Bearing mechanism and experimental research of uplift piles with ram-compacted bearing sphere

ZHOU Xiaogang1, YANG Qi′an2

(1 China Railway Design Corporation, Tianjin 300308, China；2 Beijing No.6 Construction Engineering Quality Test Department Co., Ltd., Beijing 100076, China)

Abstract:By extending the longitudinal steel bar into the bearing sphere, uplift piles with ram-compacted bearing sphere can give full play to the anchoring effect of the bearing sphere when it is under pulling force, and uplift bearing capacity is improved significantly. The uplift bearing mechanism of the uplift piles with ram-compacted bearing sphere was theoretically analyzed, and combined with an actual project, the uplift static load test of the single pile and the group pile of the uplift piles with ram-compacted bearing sphere was carried out to study the interaction between single pile and group pile when they were under the action of forces. The research results show that the single pile bearing capacity of the uplift piles with ram-compacted bearing sphere is much higher than that of the ordinary straight piles of the same size. The test results were analyzed, and a formula for calculating the uplift bearing capacity of the single uplift pile with ram-compacted bearing sphere was proposed, and its feasibility was verified by comparing with multiple domestic projects.

Keywords:uplift pile with ram-compacted bearing sphere;single pile; group pile;uplift bearing capacity;equivalent diameter;total penetrations of three drives

作者简介：周晓刚，硕士，高级工程师，Email:1767794739@qq.com；通信作者：杨启安，硕士，高级工程师，Email:yangqian2000@126.com。