【作者】 程华群； 余奇异； 徐艺飞； 戴国亮； 龚维明；

【Author】 CHENG Huaqun;YU Qiyi;XU Yifei;DAI Guoliang;GONG Weiming;Shenzhen Capol International & Associates Co.,Ltd;China Architectural Design & Research Institute Co.,Ltd..;School of Civil Engineering,Southeast University;

【机构】 深圳市华阳国际工程设计股份有限公司； 中国建筑设计研究院有限公司； 东南大学土木工程学院；

【摘要】 桩基后压浆技术是一种资源集约型的桩基技术,是实现建造绿色低碳的重要技术手段。为研究组合压浆对深圳地区高层建筑灌注桩竖向承载性能的影响,基于深圳市南山区后海T107—0068地块项目展开组合压浆试桩的自平衡加载试验,通过对比压浆前后灌注桩承载力的现场试验结果,研究了深圳地区高层建筑后压浆灌注桩承载特性及变形规律。结果表明:经组合压浆后试桩极限承载力提高显著,总桩侧阻力最高增幅达130.8%,桩端阻力最高增幅达175.6%。利用双荷载箱自平衡测试法的特点,直接测算出灌注桩极限端阻力与极限侧阻力的发挥情况,对比发现当前建筑桩基规范对后压浆灌注桩极限侧阻力标准值的估算一定程度上偏于保守,未来桩基设计中可采用自平衡检测与组合压浆工艺相结合方式来进一步优化桩径及桩长。更多还原

【Abstract】 Post-grouting technique is a resource-intensive pile foundation technology and an important technical means to achieve green and low-carbon construction.To study the effect of combined grouting on the vertical bearing performance of cast-in-place piles in high-rise buildings in Shenzhen,a self-balanced loading test of combined grouting test piles was carried out based on the T107—0068 block project in Houhai,Nanshan District,Shenzhen.Based on the field test results of bearing capacity,the bearing characteristics and deformation laws of post-grouting piles in high-rise buildings in Shenzhen are studied.The results showed that the ultimate bearing capacity of the tested piles increased significantly after combined grouting,the total pile side resistance increased by 130.8%,and the pile tip resistance increased by 175.6%.Using the characteristics of the dual-load box self-balancing test method,the performance of the ultimate end resistance and the ultimate lateral resistance of cast-in-place pile was directly measured,and it was found that the current building pile foundation code has a certain estimate of the standard value of the ultimate lateral resistance of the post-grouting cast-in-place pile to a certain extent,it is conservative.In the future pile foundation design,a combination of self-balance detection and combined grouting technology can be used to further optimize pile diameter and pile length.更多还原