摘要
结合板桩结构在铁路中的广泛使用,在高速公路改扩建工程中引入板桩结构,通过模拟不同桩体类型和荷载不同位置时拓宽路堤的力学行为,提出优选的桩体类型和最不利荷载位置.然后连续观测并分析板桩结构与CFG桩处治段的沉降,阐明板桩结构在改扩建工程中的适应性.研究结果表明,PTC桩、CFG桩和水泥搅拌桩对拓宽工程沉降的影响效果逐渐减弱,从控制沉降角度应优选PTC桩和CFG桩;荷载的最不利位置是新路堤,施工过程中必须着重控制加宽行车道内侧的质量;板桩结构对降低差异沉降的效果在半刚性基层施工过程中逐渐显现,在面层施工阶段优势明显,板桩结构是传统软土地基处治方法的有效补充,在改扩建工程中具有很好的适用性和推广前景.
With the increasing of highway extension projects and widely use of sheet piles in railway construction,the mechanical behavior of extension embankment was analyzed through simulating different kinds of pile and load of different positions. Then the optimal pile kind and the most unfavorable load position were proposed. Through continuous observing of settlement in sheet pile section and CFG pile section,the optimal adaptability of sheet pile was showed in extension projects. The analysis results showed that the effect on settlement of PTC pile,CFG pile and cement mixing pile was gradually decreased. The PTC pile and CFG pile should be firstly selected from the options of controlling settlement. The most unfavorable load position was in new embankment and its quality was the key control point in construction. The effect on decreasing differential settlement was appeared in process of semi-rigid base construction,and it would be even obvious in pavement construction. The sheet pile was an effective supplement to traditional soft soil treatment methods. It had better adaptability and foreground in highway extension projects.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2017年第5期44-49,共6页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(51208047
1302228)
中国博士后科学基金资助项目(2013M532005
2013M532070
2014T70931)
河北省省级计划资助项目(Y-2011004
Y-2011005)
关键词
道路工程
改扩建工程
差异沉降
水泥混凝土板桩
桩体类型优选
road engineering
extension projects
differential settlement
cement concrete sheet pile
pile kinds optimal
