CAJ | 학술논문

为揭示新型注浆成型螺纹桩抗拔承载机制，对桩-土界面开展试验研究。借助自主研制的大型接触面剪切仪，量测普通桩土接触面与不同螺纹间距接触面的剪切应力与相对剪切位移关系，并观察桩土接触的破坏形态。试验研究表明，无螺纹桩-土界面产生平面形态破坏面，而螺纹桩-土界面呈现拱形曲线形态破坏；螺纹加固效应主要是增大桩土间的黏聚力从而提高桩土界面的抗剪强度；桩土界面上的螺纹间距存在某一最优值，可形成最大的拱形破坏面，从而螺纹桩-土界面将发挥最大抗剪强度。
위게시신형주장성형라문장항발승재궤제，대장-토계면개전시험연구。차조자주연제적대형접촉면전절의，량측보통장토접촉면여불동라문간거접촉면적전절응력여상대전절위이관계，병관찰장토접촉적파배형태。시험연구표명，무라문장-토계면산생평면형태파배면，이라문장-토계면정현공형곡선형태파배；라문가고효응주요시증대장토간적점취력종이제고장토계면적항전강도；장토계면상적라문간거존재모일최우치，가형성최대적공형파배면，종이라문장-토계면장발휘최대항전강도。
In order to understand the uplift bearing mechanism of a new-developed grouting-screw uplift pile, experimental investigation of mechanical behaviors of the pile-soil interface was carried out. A large-scale self-developed shear apparatus is used to measure the shear stress-displacement of pile-soil interface and to observe the corresponding failure mode. Experimental results show that the non-screw pile-soil interface generates a failure plane,whilst the screw pile-soil interface produces an arch-curvature failure surface. The screwing effect on the pile-soil interface behavior leads to an increase in cohesion and shear resistance. There exist some critical interval spaces between the two neighboring screws,where the largest arch-curvature failure surface is reached and the maximum soil-pile friction resistance is activated.