铁道科学与工程学报2011，Vol.8Issue(2)：53-58,6.
长钻孔灌注桩后注浆深度及数值模拟研究
Numerical study on depth of post- grouting in -situ of length bored pile
摘要
Abstract
The pile top displacement of bored pile was analyzed by numerical simulation. Numerical analysis is performed on ultimate bearing capacity of bored pile. The results show that, when the load at pile top is equal to 700 t, the pile top displacement of un - grouting pile is 9.357 mm, while that of pile - side grouting is 6.99 mm, pile - tip grouting is 7.11 mm ( serum migrating up to 55 m), and that of combined grouting is 6.78 mm. Furthermore, the pile top displacement declines by 2.367, 2.247 and 2.577 mm respectively. The calculational ultimate bearing capacity of un - grouting pile is 1 300 t, that of pile - side grouting is 1 800 t, and that of pile -tip grouting is 1 700 t (serum migrating up to 55 m), whereas, that of combined grouting of pile side and tip goes up to 1 900 t. The bearing capacity of pile foundation provided by these three grouting methods is 38.5％,30.8％ and 46.2％ , respectively. Post - grouting technology is an effective method to decrease the pile foundation settlement in deep soft soil foundation. As for overlength bored pile in deep soft soil foundation, pile -side grouting is effective to reduce the pile foundation displacement, in this way, not only the grouting installation is simlified, but also make the construction of grouting more convenient; besides, combined grouting is suitable for the piles which need high bearing capacity or long -piles supporting by a fine supporting course.关键词
深厚软土/后注浆/有限差分法/钻孔灌注桩Key words
deep soft soil/ post- grouting/ the finite difference method/ bored pile分类
建筑与水利引用本文复制引用
安爱军,李亮,邹金锋,肖华溪,罗恒..长钻孔灌注桩后注浆深度及数值模拟研究[J].铁道科学与工程学报,2011,8(2):53-58,6.基金项目
铁道部科技重点资助项目(2008G032-3) （2008G032-3）
西部交通建设科技项目(2006318802111) （2006318802111）
