摘要
将路堤填土和刚性桩复合地基加固区、下卧层作为一个整体考虑,取路堤中心处一单桩加固单元为研究对象,设定桩土荷载分担比和桩侧摩阻力分布形式初值,运用Mindlin和Boussinesq联合求解法计算内外土柱应力和沉降,根据路堤与复合地基表面交界处位移连续条件,迭代求得实际侧摩阻力分布。建立的复合地基的桩土荷载分担与桩土相互作用的耦合模型具有较严密的理论基础,解决了M&B联合求解法需要预先已知桩土应力比以及桩侧摩阻力分布形式的问题,计算得到的桩土荷载分担、桩土沉降与工程监测数据较为吻合,验证了模型的正确性。
The embankment, composite foundation reinforcement area improved by rigid piles and the underlying layer is considered as a whole. Selecting a single pile reinforced unit located in the embankment center as the research object, based on preliminary design of the pile-soil load-sharing ratio and pile skin friction distribution, Mindlin and Boussinesq union method is used to calculate the stresses and settlements of pile and inter-pile soil. According to the conditions that the displacements at the junction of the embankment and the composite foundation surface are continuous, the distribution of skin friction is obtained using iterative method. The established coupled model of pile-soil load-sharing and pile-soil interaction of composite foundation has a rigorous theoretical basis, which solved the problem that M＆B union method needs to pre-known pile-soil stress ratio and the distribution form of pile skin friction. The results of pile-soil load-sharing and pile-soil settlement are all consistent with the project monitoring data, which verified the validity of the model.
出处
《公路交通科技》
CAS
CSCD
北大核心
2013年第8期43-48,共6页
Journal of Highway and Transportation Research and Development
