摘要
针对碎石桩容易在桩顶1～3倍桩径高度范围内发生鼓胀破坏现象,提出一种新型碎石桩复合地基:混凝土-碎石散体材料串联组合桩复合地基,并阐述了该新型复合地基的施工工艺。基于计算深基础承载力Meyerhof法,采用多滑块破坏模型,建立了混凝土-碎石散体材料串联组合桩深层鼓胀破坏计算模型,通过随机优化算法寻找临界滑动面,计算得到其单桩极限承载力。将该新型组合桩的承载力理论计算值与数值仿真计算结果、传统碎石桩承载力试验结果进行对比分析,结果表明:提出的多滑块解析计算方法准确性较好;新型桩的承载力比传统碎石桩承载力有了明显提高,相较于传统碎石桩,新型组合桩在混凝土桩段长度1 m时承载力计算值提高了32.76%,在混凝土桩段长度2 m时,承载力计算值提高了54.74%。
It is easy for the crushed stone pile to destroy within the height range of 1 ~ 3 times of the height of pile diameter. A new type of composite foundation with gravel pile composite foundation,concrete-gravel bulk material series-coupled pile composite foundation was proposed,and the construction technology of the new composite foundation was explained. Based on the Meyerhof method in calculating the deep foundation bearing capacity,a multislide failure model was used to calculate the deep-layer bulging failure of the composite pile of concrete-gravel bulk material. The critical slip surface was found by stochastic optimization algorithm,and the ultimate bearing capacity of single pile was calculated. The calculated results of the bearing capacity of the new composite pile were compared with the results of the numerical simulation and the bearing capacity of the traditional gravel pile. The results show: the accuracy of the proposed multi-slide analytical method is better. The bearing capacity of the new pile is obviously higher than that of the conventional gravel pile. When the concrete pile length is 1 m,the bearing capacity of new type pile is increased 32. 76%. When the concrete pile length is 2 m,the bearing capacity of new type pile is increased 54.74%.
作者
郭尤林
赵明华
付贵海
余鹏飞
Guo Youlin;Zhao Minghua;Fu Guihai;Yu Pengfei(Geotechnical Engineering Institute,Hunan University,Changsha 410082,P.R. China;College of Civil Engineering,Hunan City University,Yiyang,Hu'nan 413000,P.R. China;Ziyang District,Yiyang City of Hunan Province Highway Administration,Yiyang,Hu'nan 413000,P.R. China)
出处
《地下空间与工程学报》
CSCD
北大核心
2018年第6期1625-1633,共9页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51278187)
湖南省自然科学基金(2016JJ4013)
湖南省教育厅科学研究项目重点项目(16A038)
湖南省教育厅科学研究项目一般项目(16C0304)
