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静压桩残余应力对桩工作性状具有重要影响。通过黏性土地基中静压敞口高强预应力混凝土(PHC)管桩静载荷试验,阐明了沉桩结束后的残余应力分布特征,并对载荷试验过程中残余应力对荷载传递性状及承载力的影响进行了分析。结果显示,沉桩结束后静压桩残余应力较大,桩端残余应力占沉桩应力比值约为7.1%;残余应力沿桩身呈双曲线分布,于中性面处达到峰值;载荷试验过程中,残余应力对荷载传递性状的影响与桩顶荷载大小密切相关。不考虑残余应力影响将高估中性面以上桩侧极限摩阻力16.3%~19.5%,低估中性面以下桩侧极限摩阻力19.8%,残余应力对桩承载力影响不大。
The residual stress of static pile has an important influence on the working characteristics of the pile. Through the static load test of static pressure open high strength prestressed concrete (PHC) pipe pile in cohesive soil foundation, the distribution characteristics of residual stress after the end of pile sinking are clarified. And the relationship between residual stress and load transfer characteristics and bearing capacity The impact of the analysis. The results show that the residual stress of the jacked pile after the sinking pile is large, the residual stress of pile tip is about 7.1%, and the residual stress is hyperbolic along the pile body and reaches the peak at the neutral face. During the loading test , The effect of residual stress on load transfer characteristics is closely related to the load on pile top. Excluding the effect of residual stress, the ultimate friction on the pile side above the neutral plane will be overestimated by 16.3% -19.5%, and the ultimate friction on the pile side below the neutral plane will be underestimated by 19.8%. Residual stress has little effect on the bearing capacity of the pile.