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通过小比例半截面模型桩模型试验,研究在竖向压力作用下不同盘间距的混凝土扩盘桩的桩周土体的破坏状态。试验中通过自制的原状土取土装置在现场取土样,制作不同盘间距的半截面桩试件,并进行加载,观察桩周土体破坏的全过程。通过对比破坏状态,对盘间距对桩周土的破坏状态的影响进行定性分析,提出盘间距的合理取值范围为(4~6)R0(R0为盘悬挑长度)。
Through the test of small-scale half-section model pile model, the failure state of the soil around the pile of concrete-filled pile with different disk spacing under vertical pressure is studied. In the experiment, soil samples were taken from the original undisturbed soil borrow device in the field to make half-section pile specimens with different disc spacings and loaded to observe the whole process of soil failure around the pile. By comparing the failure state, the influence of disk space on the failure state of soil around piles is qualitatively analyzed. The reasonable range of disk spacing is given as (4 ~ 6) R0 (R0 is disk overhang length).