通过现场静荷载试验,在膨胀土地基中对桩身穿越大气影响深度并以硬塑黏土为承力盘和桩端持力层的单节DX挤扩灌注桩及以硬塑黏土为上承力盘持力层和以硬塑—坚硬黏土为下承力盘和桩端持力层的两节DX挤扩灌注桩的极限承载力进行判定,分析其荷载传递机理,并对两类桩的侧阻力、盘端阻力和桩端阻力的分配及其发展规律进行研究。 Through on-site static load tests, the impact depth of the pile through the atmosphere in the expansive soil foundation, and the single-section DX squeezed and cast-in-place pile with hard plastic clay as the bearing plate and pile bearing layer and the upper bearing capacity with hard plastic clay The determination of the ultimate bearing capacity of the two DX squeeze-in-place piles with disk holding layer and hard plastic-hard clay for the lower bearing plate and the pile bearing layer, analysis of the load transfer mechanism, and the two types of pile side The distribution of resistance, end-of-displacement resistance, and end-resistance drag are studied.