Detailed particle breakage adjacent to a pile has great influence on the settlement and bearing capacity of a pile foundation. Before the pile test, coral sand was divided into different grain-size groups and dyed in different colors, then mixed as the ground soil. After pile penetration, the sand around the pile was divided into many zones and sampled. Grains in different colors in each size range of each sample were discerned quantitatively. Results show that the settlement curve dropped fast and the skin friction of pile was small due to the obvious particle breakage. In each zone, the actual particle breakage in each size range was different from the change in relative mass percentage, and the lost of angular edges is the dominant type of particle breakage under the bottom pressure of pile. The index B_ag, excluding the interference effect of size overlap between fragments and unbroken grains in each size range, was slightly larger than B_g for most zones around the pile. The breakage-zone was limited to 1.5 times of the pile diameter at the radial direction and 2.5 times at the depth direction, which is much deeper than that in silica sand. Particle breakage at some distance from pile bottom is larger than that at the very bottom of the pile due to the shearing effect in the sand. Detailed particle breakage around the pile is useful in studying the interaction between the pile and crushable granular soil.

邻近桩的细微颗粒破碎对桩基础的沉降和承载力有很大影响。在进行桩桩试验之前，将珊瑚砂分为不同的粒度组，并以不同的颜色染色，然后混合为地面土壤。桩穿透后，桩周围的沙子被分成许多区域并取样。定量识别每个样品每个尺寸范围内不同颜色的谷物。结果表明，由于明显的颗粒破损，沉降曲线下降较快，桩的表皮摩擦较小。在每个区域中，每个尺寸范围内的实际颗粒破损与相对质量百分比的变化不同，并且在桩底压力下，角边缘的损失是颗粒破损的主要类型。指数B _ag在每个尺寸范围内，除了碎片和未破碎晶粒之间尺寸重叠的干扰效应外，对于堆周围的大多数区域，Bg略大于B _g。破裂区域在径向上被限制为桩直径的1.5倍，在深度方向上被限制为2.5倍，这比硅砂中的深得多。由于在沙子中的剪切作用，在距桩底一定距离处的颗粒破裂大于在桩底处的破裂。桩周围的详细颗粒破碎对于研究桩与可破碎的粒状土壤之间的相互作用非常有用。