摘要
针对软土地区某邻近建筑桩基的基坑开挖施工,建立了考虑桩土共同作用的二维有限元数值模型。根据简化bishop法和有限元强度折减法,对工程基坑采用放坡无支护开挖方式进行边坡稳定性分析,给出了不同工况下基坑边坡安全系数最小解。通过基坑开挖对周边建筑桩基影响的数值模拟,研究了由不同堆载情况引起的基坑边坡变形造成的建筑桩基偏移及桩基受力。研究结果表明:软土地区无支护基坑开挖引起的边坡失稳是造成周边建筑桩基偏移的主要影响因素,基坑周边的堆载对加大边坡失稳也起到了较大作用。
Aimed at a pit excavation construction in soft soil area that adjacent to a building pile foundation, the two -dimensional infinite element numerical model was established. According to the simplified bishop method and finite element strength reduction method, slope stability of unsupported excavation method was analyzed and the foundation pit slope minimum safety factors under different working condi- tions were given. By numerical simulation of influence of pit excavation surrounding building pile to foundation through finite element soft- ware, the pile migration and pile force caused by pit slope deformation under different loads were analyzed. The results of the study show that, slope instability caused by unsupported excavation in the soft soil area is main factor leading to peripheral building pile foundation mi- gration, and the increasing of surround stack at slope also plays a great role in slope instability.
出处
《福建建设科技》
2015年第1期1-4,共4页
Fujian Construction Science & Technology
关键词
边坡
稳定分析
桩基偏移
土体位移
安全系数
slope
stability analysis
pile migration
soil displacement
safety factor
