铁道科学与工程学报2017，Vol.14Issue(2)：241-249,9.
路堤荷载下长短桩加固黄土地基影响因素的分析
Research on influence factors of long-short pile reinforced loess foundation under embankment
摘要
Abstract
The study and relevant experience on working mechanism of long-short pile composite foundation under embankment is rare in loess plateau. In order to understand the interaction of piles and soil, combined real project with MIDAS/GTS, the influence of pile length, pile spacing and stiffness of substratum on composite foundation are studied in this article. The main results are as follows: the increase of pile length and substratum stiffness, the decrease of pile spacing can reduce the settlement within certain limits. Because of the negative skin friction, the maximum stress of long-short pile composite foundation appears at a certain depth near the top of pile. When the lengths of long and short pile are 18 m and 8 m, the maximum stress of long pile is 1831.7 kPa. The stress of long/short pile decreases with the increase of the short/long pile length. With the increase of long pile length, pile spacing and substratum stiffness, the pile soil stress ratio of long pile increases at first, and then maintain stable. The pile soil stress ratio of short pile increases with the increases of its' length, but decreases with spacing, while increases at first, and then become stable with substratum stiffness. Therefore, when the required settlement and bearing capacity are meeting, the length and spacing should be designed on the basis of the project cost and the tip of pile should support on the harder bearing layer. These results have reference value for the design and construction of composite foundation with long and short piles.关键词
长短桩/复合地基/现场试验/数值模拟/承载特性/影响因素Key words
long-short pile/composite foundation/field test/numerical simulation/bearing characteristics/influence factors分类
建筑与水利引用本文复制引用
李善珍,马学宁,田兆斌..路堤荷载下长短桩加固黄土地基影响因素的分析[J].铁道科学与工程学报,2017,14(2):241-249,9.基金项目
国家自然科学基金资助项目(41562014) （41562014）
长江学者和创新团队发展计划项目(IRT1139) （IRT1139）
