微型抗滑桩极限抗弯承载力试验研究

对桩心配筋桩、钢管+桩心配筋桩和钢管+H型钢桩共27根试件进行极限抗弯承载力试验，发现桩心配筋桩极限抗弯承载力较低且为脆性破坏，钢管+桩心配筋桩和钢管+H型钢桩表现出较高的极限抗弯承载力和延性性能。对桩心配筋桩、钢管+桩心配筋桩和钢管+H型钢桩荷载位移曲线进行分析，将桩心配筋桩受荷分为试件咬合阶段、弹性阶段、弹塑性阶段和破坏阶段，将钢管+桩心配筋桩和钢管+H型钢桩分为试件咬合阶段、弹性阶段、弹塑性阶段和强化阶段。钢管+桩心配筋桩极限抗弯承载力计算可用钢管混凝土桩极限抗弯承载力乘以1.2的提高系数计算。

Study on the ultimate flexural bearing capacityof micro anti-slide piles

The ultimate flexural bearing capacity test was carried out through a total of 27 root specimen of the heart reinforcement pile, the steel pipe + heart reinforcement pile, the steel pipe + H section steel pile. It wasfound that the heart reinforcement pile ultimate flexural bearing capacity is low and that the failure was of brittle type, while the steel pipe + heart reinforcement pile and the steel pipe + H section steel pile show a higher bearing capacity and was of better ductility performance. Through the load-displacement curve, the heart reinforcement ile under loading is divided into specimen bite stage, elastic stage, elastic-plastic stage and failure stage, while the steel pipe + heart reinforcement pile and the steel pipe + H section steel pile can be divided into specimen bite stage, elastic stage, elastic-plastic stage and strengthening stage. The ultimate flexural bearing capacity for steel pipe + heart reinforcement pile can be regarded as that of steel pipe concrete pile multiplied by an increase coefficient of 1.2.