铁道科学与工程学报2016，Vol.13Issue(10)：1919-1925,7.
水泥土挤密桩加固过渡段路基对平顺性影响研究
Track regularity influence study of reinforce bridge transition section by cement soil compaction pile
摘要
Abstract
Some site tests are carried out at Xin-feng river bridge transition section in Nanjing-Qidong existing railway, such as bearing capacity, dynamic elastic modulus(Evd). It is found that the subgrade bearing capacity is serious insufficient before reinforcement, and Evd value also can not meet the requirements of speed up to 200 km/h. Insufficient bearing capacity produces a series of problems, such as ballast groove disease, peak dynamic stress is too large (reach to 196.03 kPa), tracks stiffness and deflection value is not in reasonable range, etc. Because of these problems, the bridge-subgrade transition section is found to be not smooth. Cement-soil com-paction piles were used to reinforce the transition section subgrade. After reinforcement, test shows that each measuring point average dynamic earth pressure reduced by 23.14%. At the sametime, track overall stiffness in-creased by 23.14% and deflection reduced by 31.40%. These results indicate that cement-soil compaction pile can effectively slow down the transition section irregularity problem.关键词
路基工程/轨道整体刚度/加固对比/过渡段路基/动土压力Key words
subgrade engineering/track integral stiffness/reinforced contrast/bridge transition section/dynamic earth pressure分类
交通工程引用本文复制引用
赵秀绍,王志军,祝建农,乔志邦,刘庆杰..水泥土挤密桩加固过渡段路基对平顺性影响研究[J].铁道科学与工程学报,2016,13(10):1919-1925,7.基金项目
国家自然科学基金资助项目(51208198,51668018) （51208198,51668018）
江西省教育厅资助项目(JXJG-13-5-15) （JXJG-13-5-15）
华东交通大学博士科研启动基金项目(01306022) （01306022）
