挤密桩在红黏土地基中挤密效果影响因素试验研究  

Experiment study on influencing factors of compaction effect of compaction pile in red clay foundation

作　　者：赵秀绍[1] 谭周勇 李凯[1] 郑伟[1] 莫林利[2] ZHAO Xiushao;TAN Zhouyong;LI Kai;ZHENG Wei;MO Linli(Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnique Engineering,East China Jiaotong University,Nanchang 330013,China;School of Software,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学江西省岩土工程基础设施安全与控制重点实验室,江西南昌330013 [2]华东交通大学软件学院,江西南昌330013

出　　处：《铁道科学与工程学报》2018年第7期1730-1737,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51668018;51208198;51508192);江西省重点试验室资助项目(2016BCD40002)

摘　　要：基于室内桩孔水泥土夯击试验,研究夯锤形状、夯锤落距和夯击次数对挤密力和压实系数的影响规律,建立拟合数学模型。研究结果表明:平底锤对桩底的挤密力最大,锥底锤对桩侧的挤密力最大。挤密力和桩体压实系数与夯击次数、夯锤落距之间存在对数函数相关性,用对数数学模型计算挤密力平均误差不超过7 k Pa,压实系数平均误差不超过2%;根据桩体压实系数的数学模型和挤密力随夯击次数的规律,以夯击能作为考量标准,提出最优夯击方案为锤底为锥形、30 cm落距和每层夯击30次。Based on cement-soil compaction experimental study in pile holes, using compaction force and pile compaction coefficient as control index, some influence factors were studied, such as hammer shape, tamping times and hammer drop distance, and then influence law was determined by regression analysis method. Some conclusions were drawn： Flat bottom hammer has biggest bottom compaction force and cone bottom hammer has biggest lateral compaction force. The relationship between compaction force and compaction times, hammer drop distance can be estimated by logarithmic mathematical model. The compaction force average error of the calculated value is not more than 7 k Pa, and the pile compaction coefficient average error is less than 2%. According to the compaction coefficient mathematical model and compaction force law, taking tamping energy as measure standard, the optimal scheme of using cone bottom hammer, 30 cm drop distance and 30 compaction times is put forward.

关 键 词：水泥土挤密桩 数学预估模型 挤密力 锤底形状 优化 

分 类 号：TU472.3[建筑科学—结构工程]