后压浆桩竖向承载性能室内与现场试验研究

Laboratory and Field Test Research on Vertical Bearing Capacity of Post-grouting Piles

基于砂土和黏性土地基中模型桩桩侧压浆的室内试验,文章对未压浆桩与后压浆桩的静载试验测试数据进行对比分析,研究桩侧注浆对桩体承载变形性状、桩侧土阻力等的影响。结果表明,桩侧和桩端注浆可显著提高桩基竖向承载性能;注浆浆液形成的固化体与模型桩形成复合桩身,有效改善了桩土受力状态与荷载传递特性;桩侧和桩端注浆后增大了桩侧土体强度,从而提高了桩基承载性能的稳定性。

Based on the laboratory test of model pile side grouting in sand and cohesive foundation, this paper compares and analyzes the static load test data of non-grouting piles and post-grouting piles, and studies the influence of pile side grouting on the bearing deformation properties of the pile body and soil resistance of the pile side. The results show that grouting at the pile side and pile end can significantly improve the vertical bearing capacity of the pile foundation. The solidified body formed by grouting slurry and the model pile form a composite pile body, which effectively improves the stress state and load transfer characteristics of pile soil. After grouting at the pile side and pile end, the soil strength at the pile side is increased, thereby improving the stability of the bearing capacity of the pile foundation.