【摘要】 普通抗拔桩承载时桩身处于受拉状态，在上拔力作用下易产生裂缝进而影响其耐久性与安全性，为避免此缺点的影响，开发了一种带“扩大头锚固端”的压力型抗拔管桩，并通过室内单桩静载抗拔对比试验研究了压力型抗拔桩与普通拉力型抗拔桩的受力机理与承载能力。结果表明：达到承载极限状态时，拉力型抗拔桩桩身出现明显裂缝，压力型抗拔桩桩身完好没有出现裂缝，且极限抗拔承载力比拉力型桩高25%。两者桩-土摩阻力随深度均呈现“先变大后变小”的趋势，压力型桩的单位面积摩阻力最大值约为拉力型的3倍，能更加充分发挥桩侧摩阻力。距离两桩最远处的3、6号土压力盒数值非常接近，两桩在土体内的应力场水平影响范围相近。更多还原

【Abstract】 The pile body is in tension when the ordinary uplift pile is loaded, and it is easy to produce cracks under the action of uplift force, which will affect its durability and safety. To avoid this disadvantage, a pressure-type uplift pipe pile with enlarged head anchor end was developed. Through the indoor single pile static load tensile comparison test, the mechanical mechanism and bearing capacity of pressure-type uplift pile and ordinary tension uplift pile were studied.The results show that when the bearing limit state is reached,there are obvious cracks in the tension type uplift pile body, and there are no cracks in the pressure-type uplift pile body. The ultimate uplift bearing capacity is 25% higher than that of the tension type pile. The pile-soil friction resistance of the two types of piles shows a trend of increasing first and then decreasing with depth. The maximum value of the unit area friction resistance of pressure type piles is 3 times of that of tension type piles,which can give full play to the pile side friction resistance. The values of No. 3 and No. 6 soil pressure boxes which are farthest from the two piles are very close, and the horizontal influence range of stress fields in the soil body of the two piles is similar.更多还原