钻孔灌注长桩试验曲线型式及破坏机理探讨

Styles of Test Curves and Damage Mechanism of Long Bored Piles

根据百余根钻孔灌注桩现场静载试验资料［１］，总结了钻孔灌注长桩的静载试验曲线（荷载Ｐ、沉降Ｓ、时间ｔ）的主要类型及其特征；讨论与之相关的破坏规律和极限承载力判定方法、影响因素；提出根据桩长和长径比判定为长桩的大致标准；就长桩的合理尺寸和沉降控制提出新的看法和建议。

Based on the results of over one hundred long bored piles in situ tests,three main styles of the P S and S lg t curves are concluded. The damage mechanism and limit bearing capacity are also discussed. According to the length and the ratio of length to diameter,the long bored piles are defined. In the end ,the authors provide the reasonable size and settlement controlling standard,as well as suggest how to strengthen the long bored piles.