水平荷载作用下螺旋桩基础试验研究

该文选取叶片距宽比存在差异的2种螺旋桩展开水平加载试验,对不同水平荷载等级下螺旋桩桩顶水平位移、竖向位移、桩周土横向及纵向应力展开分别分析,在各级水平荷载施加后5、10、15 min分别进行测量,分别得到2个螺旋桩的荷载及位移关系曲线,可据此判断螺旋桩基础水平加载过程中,荷载及位移、地基应力间的变化趋势。总结出叶片距宽比是水平荷载作用下影响螺旋桩极限承载力的重要影响因素,旨在为水平荷载作用下螺旋桩桩体反弯点位置的判定提供依据。

In this paper,two kinds of spiral piles with different blade width-to-width ratio are selected to carry out horizontal loading tests,and the horizontal displacement of spiral pile top,vertical displacement,lateral and longitudinal stress of soil around pile are respectively analyzed under different levels of horizontal load.Measurements are carried out 5 min,10 min and 15 min after each level of horizontal load is applied.The relation curves of load and displacement of two spiral piles are obtained respectively,which can be used to judge the variation trend of load,displacement and foundation stress during horizontal loading of spiral pile foundation.It is concluded that blade width ratio is an important factor affecting the ultimate bearing capacity of spiral pile under horizontal load,in order to provide a basis for determining the position of reverse bending point of spiral pile under horizontal load.