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基于3根桩端和桩侧后注浆的大直径超长桩破坏性试桩试验,对超长桩的桩顶荷载-桩顶沉降特性、桩身侧阻力及端阻力的发挥特性等进行了分析。结果表明,在桩身完整和桩底沉渣较小的情况下,超长桩加载到一定荷载水平时仍然可能发生陡降式破坏。在承载力特征值作用下,超长桩承载特性可以认为是纯摩擦桩。由于超长桩桩身压缩量较大,桩身侧阻力由上向下逐步发挥。超长桩侧阻力软化现象主要发生在桩身中上部侧阻力发挥较早的部分,桩身下部侧阻力发挥较晚而未发现侧阻力软化现象。
Based on the test of three kinds of pile ends and post-grouting large diameter super long pile destructive test pile, the pile top load, the settlement characteristics of pile top, the lateral resistance and the end resistance of the extra long pile are tested analysis. The results show that the steep descending failure may occur when the over-long pile is loaded to a certain load level when the pile body is intact and the bottom sediment is small. Under the effect of the characteristic value of bearing capacity, the bearing characteristics of super-long piles can be considered as pure friction pile. As the super-long pile body compression is large, pile side resistance gradually from top to bottom. The softening of the long pile side resistance mainly occurred in the upper part of the pile body to play an earlier part of the resistance, lower resistance on the pile to play late did not find side-resistance softening phenomenon.