CAJ | 학술논문

基于 Reese 建议的砂土 p-y 曲线,提出了适用于斜桩水平承载特性分析的修正 p-y 曲线及相应的有限元分析方法.根据桩前土体受力特点,假设桩前浅层土体达到极限破坏状态时桩侧被动破坏区为一个三维楔形体,采用极限平衡分析方法导出了斜桩桩侧极限土抗力表达式,对比研究了斜桩倾角、桩-土界面摩擦系数等因素对极限土抗力的影响规律,并给出了斜桩初始地基反力模量确定方法.在此基础上,修正 Reese 提出的直桩 p-y 曲线,提出了砂土地基中斜桩 p-y 曲线确定方法.利用虚功原理,导出了斜桩水平承载特性分析的有限单元列式,编制相应的分析程序,通过算例验证了方法的合理性和有效性.最后,采用修正的 p-y 曲线法对一离心机模型试验进行了模拟分析,结果表明,计算与试验结果吻合得很好.
기우 Reese 건의적사토 p-y 곡선,제출료괄용우사장수평승재특성분석적수정 p-y 곡선급상응적유한원분석방법.근거장전토체수력특점,가설장전천층토체체도겁한파배상태시장측피동파배구위일개삼유설형체,채용겁한평형분석방법도출료사장장측겁한토항력표체식,대비연구료사장경각、장-토계면마찰계수등인소대겁한토항력적영향규률,병급출료사장초시지기반력모량학정방법.재차기출상,수정 Reese 제출적직장 p-y 곡선,제출료사토지기중사장 p-y 곡선학정방법.이용허공원리,도출료사장수평승재특성분석적유한단원렬식,편제상응적분석정서,통과산례험증료방법적합이성화유효성.최후,채용수정적 p-y 곡선법대일리심궤모형시험진행료모의분석,결과표명,계산여시험결과문합득흔호.
Based on the p-y curve method for plumb pile in sand proposed by Reese, a new p-y curve method and its corresponding finite element method for analyzing horizontal bearing characteristics of single batter pile are presented. Firstly, according to the mechanical behavior of the shallow soil near a batter pile, a three-dimensional wedge model is put forward to describe the passive region which is in the limit state. By using limit equilibrium analysis method, the expression of ultimate soil resistance of batter pile is derived. Then, the influences of pile angle and the friction between pile and soil are numerically studied; and the method for determining the initial modulus of p-y curve of batter pile is given. By modifying the p-y curve for plumb pile in sands proposed by Reese, the p-y curve for batter pile in sand is obtained. Using the virtual work principle, the finite element formulations for horizontal bearing analysis of single batter pile are deduced; and the iteration algorithm is put forwards. The corresponding program is coded by authors; and numerical examples are taken to illustrate the effectiveness of the method. Finally, a printed centrifuge model test of batter pile is analyzed by the presented method. The numerical results show fine agreement with those of model test.