黄土地区后压浆钻孔灌注桩工程性状研究

钻孔灌注桩后压浆技术可提高桩的竖向承载力、减少桩的沉降并改善桩的工程性状。本文依据西安地区某工程中采用桩侧和桩端后压浆和没压浆的 4根钻孔灌注桩单桩竖向抗压静载荷试验和桩身轴力测试的对比 ,分析了黄土地基中后压浆钻孔灌注桩桩身轴力的传递规律、桩侧阻力及桩端阻力的发挥性状 ,探讨了后压浆技术对钻孔灌注桩承载力的影响。

Study on Engineering Behaviors of Post-grouting Bored Piles in Loess Area

The post-grouting technique for bored piles can incre ase the vertical bearing capacity of piles, decrease the subsidence and improve the engineering behaviors of piles. Based on the analysis of testing results fro m the vertical static loading tests and the axial force tests for the four piles with or without post grouting in Xi'an , the transferring law of the axial f orce of piles and the behaviors of the lateral friction resistance and the end beari ng of the bored piles in loess subsoil are analyzed. The influences of post-gro uting technique to the bearing capacity of bore piles are discussed.