CAJ | 학술논문

在工程实践中，抗拔桩基础已经得到广泛应用，但对于抗拔桩工作机理却研究较少。通过现场足尺试验，分析了抗拔桩的承载特性和变形特性，包括抗拔桩桩顶与桩底位移、桩身轴力分布、侧摩阻力分布以及侧摩阻力和桩土相对位移的关系等，试验结果表明：抗拔桩在受到上部荷载作用时，桩顶和桩底同时产生位移；随着上部荷载的增加，桩体下部侧面摩阻力逐次发挥作用，同时由于荷载在向下传递时不断减小，下部桩身所受轴力较小，桩土之间的相对位移也较小，桩侧摩阻力不易全部发挥出来。桩周各土层土的侧摩阻力达到最大所需的相对位移也可以利用桩土相对位移与侧摩阻力的关系曲线推算得出。试验结果对工程设计计算及相关研究提供了一定参考。
재공정실천중，항발장기출이경득도엄범응용，단대우항발장공작궤리각연구교소。통과현장족척시험，분석료항발장적승재특성화변형특성，포괄항발장장정여장저위이、장신축력분포、측마조력분포이급측마조력화장토상대위이적관계등，시험결과표명：항발장재수도상부하재작용시，장정화장저동시산생위이；수착상부하재적증가，장체하부측면마조력축차발휘작용，동시유우하재재향하전체시불단감소，하부장신소수축력교소，장토지간적상대위이야교소，장측마조력불역전부발휘출래。장주각토층토적측마조력체도최대소수적상대위이야가이이용장토상대위이여측마조력적관계곡선추산득출。시험결과대공정설계계산급상관연구제공료일정삼고。
The uplift pile has been widely used in engineering projects ,but its bearing mechanism is not well known up to now .To study the uplift behavior and deformation characteristics of the piles ,the full-scale field tests on single uplift pile with uniform cross-section were performed .The tests included the displacement of top and bottom of the uplift pile , distribution of axial force of the pile ,distribution of side friction as well as the relationship between friction and relative displacement between the pile and soil .The result showed that displacement occurred at the top and bottom of the uplift pile under the upper load ,the side friction resistance of lower part of the pile body gradually came into play with the in-creasing of the upper load ;but due to the gradual decrease of the load in the transfer process ,the axial force of lower part of the pile body as well as the pile-soil relative displacement were small ,which prevented the side friction of pile from performing its full potential .Meanwhile ,the required relative displacement for the maximum side friction resistance of the soil surrounding the pile could be deduced from the curves of pile-soil relative displacement and side friction resistance . The tests results are advantageous to the engineering design and relative research of similar projects .