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通过室内模型试验,对黄土地基中大直径超长群桩基础的承载-沉降关系、承台下土体附加应力的分布及发展、桩土承载情况以及不同位置桩的受力特性分别进行了研究。结果表明:黄土地基中大直径超长群桩基础荷载-沉降曲线呈缓变型且没有明显拐点,故群桩基础的极限承载力应综合沉降-时间对数s-lgt曲线和荷载-沉降Q-s曲线来确定。承台下土体附加应力分布为边缘大中心小。不同位置的桩承载性能不同,总体上是角桩(6#桩)最大,边桩(5#桩)次之,中心桩(1#桩)最小;同时各桩的桩侧摩阻力及桩身轴力沿桩长的变化也有所不同。
Through the indoor model test, the relationship between bearing capacity and settlement of large-diameter overlength group pile foundation in loess foundation, the distribution and development of additional stress of soil under bearing platform, the bearing capacity of pile and soil and the stress characteristics of pile at different positions were studied respectively . The results show that the load-settlement curve of the large-diameter overlength group pile foundation in loess foundation shows a gradual change without obvious inflection point. Therefore, the ultimate bearing capacity of pile foundation should be integrated with the settlement-time logarithm s-lgt curve and load-settlement Qs curve to make sure. Subsoil soil additional stress distribution edge of the small center. In different positions, the bearing capacity of piles is different, the largest is angle piles (# 6 piles), followed by 5 # piles, while the center piles (# 1 piles) is the smallest. At the same time, the pile side friction and pile Axial forces vary along the length of the pile.