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基于透明土和数字图像处理技术,开展扩底(含扩大头)楔形桩和普通楔形桩沉桩过程对比模型试验,动态观测桩周土体在楔形桩沉桩过程中的变形规律及其沉桩影响半径,讨论沉桩过程中扩大头存在对桩周土体位移场的影响规律.结合沉桩过程中土体表层径向位移量,对比分析了常规天然土体模型试验、圆孔扩张理论计算和本文基于透明土材料的模型试验等3种方法之间的异同点,验证了本文方法的合理性.本文试验条件下,含扩大头楔形桩沉桩过程中桩周位移(竖向和径向)、沉桩影响半径分别是常规楔形桩的2.0倍和1.3倍左右.
Based on the transparent soil and digital image processing technology, the contrastive model test of the expanding pile (including enlarged head) wedge pile and the ordinary wedge pile sinking pile was carried out. The deformation law of the soil around the pile wedge pile during dynamic observation and its sinking pile The radius of influence and the influence law of the enlarged head on the displacement field of the soil around the pile during pile sinking are discussed.Considering the radial displacements of the soil surface during pile sinking, the conventional natural soil model tests, And the model test based on transparent soil material, this paper verifies the rationality of the method in this paper.In this paper, under the experimental conditions, the pile displacement (vertical and radial ), And the radius of pile driving are respectively 2.0 times and 1.3 times that of conventional wedged piles.