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基于北京某工程钻孔灌注桩现场静荷载和桩身应力测试结果,对桩侧摩阻力、桩端阻力的发挥特性进行了对比分析,采取后注浆工艺可以较大幅度提高桩的单桩承载力性能。采用后注浆工艺,充分加强了桩与土之间相互作用的有利方面,使桩-土体系更加紧密地形成一个协同工作的系统,改善了基桩的承载性状。采用后注浆技术后,可适当减小桩径及桩长或减少工程桩数量,从而降低桩基工程造价,取得明显的技术经济效益。
Based on the field static load and pile stress test results of a cast-in-site bored pile in Beijing, the contrastive analysis on the frictional resistance and pile end resistance of the pile is carried out. By adopting the post-grouting technology, the pile bearing capacity can be greatly improved Force performance. The post-grouting process fully strengthens the favorable aspects of the interaction between the pile and the soil, so that the pile-soil system more closely forms a synergistic working system and improves the bearing properties of the pile. After the use of post-grouting technology, the pile diameter and pile length can be appropriately reduced or the number of engineering piles reduced, so as to reduce the pile foundation construction cost and achieve obvious technical and economic benefits.