基于m法的弹性长桩的水平静载测试研究

The Lateral Static Road Test Study of Single Long Elastic Pile Based on M-method

为研究弹性长桩的水平承载性能,对实际工程进行水平静载测试。基于m法分析弹性长桩的m值、水平位移和桩侧最大弯矩。结果表明:等直径的灌注桩和PHC管桩相比,在相同水平荷载作用下,灌注桩m值较大,侧向抗力分布近似,最大弯矩平均值略小;《建筑桩基技术规范》估算的m值明显偏小,建议设计时m值取值以水平静载测试为准;"挠曲深度"是指土体对弹性长桩的约束反力的有效作用范围,桩侧最大弯矩位置相对挠曲深度是基本固定的。

According to the engineering case, the lateral static road test is done for researching the horizontal load-carry properties of the single long elastic piles. The single long elastic pile is analyzed for its m-value,horizontal displacement and pile-side maximum moment based on m-method. The results indicate that the bored piles, under the same road, compared to the same diameter＇s PHC piles, have higher m-value, similar distribution of lateral reaction and little lower average of maximum moment. The m-value estimated by JGJ94 is much lower, which should be selected based on the lateral static road test during the piles design process. The＂flexural depth＂ refers to the effective area of the soil＇s restrained reaction on the single long elastic piles. The position of pile-side maximum moment relative to flexural depth is basically fixed.