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设计了一个室内模型试验来研究支盘桩在重复荷载作用下的承载和变形性能。试验证明:支盘桩在其极限承载力约75%的荷载重复作用下变形增加很小,工作性能十分稳定;支盘桩与普通等直径桩相比,其承载力和抗变形能力十分优越;支盘桩的荷载传递机理是十分复杂的,盘附近土体对桩周的摩擦阻力在不同荷载作用下有时为正有时为负;当两盘的间距在2D(D为盘直径)以下时,桩周的摩擦力对桩的承载力贡献很小,在每次加卸载后土体会建立新的固结平衡状态。文章根据桩周土体土拱的形成和变化情况对上述有关现象进行了分析,还对设计支盘桩时确定合理的桩间距和盘间距提出了自己的观点。
An indoor model test was designed to study the bearing and deformation behavior of the branch pile under repeated loading. The test results show that the branch pile under the load repetition of about 75% of its ultimate bearing capacity has little deformation increase and its working performance is very stable. Compared with ordinary equivalent diameter piles, the branch pile has very good bearing capacity and deformation resistance. The load transfer mechanism of the branch pile is very complicated. The frictional resistance of the soil around the plate to the pile periphery is sometimes positive and sometimes negative under different loads. When the distance between the two plates is below 2D (D = disc diameter) The pile friction contributes little to the bearing capacity of the pile, and the soil will establish a new consolidation equilibrium after each loading and unloading. According to the formation and variation of soil arching around the soil around the pile, this paper analyzes the above phenomena, and puts forward its own point of view to determine the reasonable spacing between piles and the distance between piles.