CAJ | 학술논문

根据常法向刚度条件下结构面剪切力学特性研究嵌岩桩的荷载传递机制.考虑桩–岩界面胶结作用,提出完整的嵌岩桩桩–岩界面剪切机制,即包括胶结破坏、滑动剪胀及剪切滑移3部分;根据桩–岩界面不同剪切阶段的力学特性,建立完整的桩–岩界面剪切本构方程.基于结构面剪切力学特性,从理论上分析嵌岩桩桩侧阻力强化效应的产生机制.研究结果表明,桩侧阻力增强效应在整个桩侧都有发生,但在桩端附近桩侧最为明显.在机制分析的基础上,提出考虑桩侧阻力强化效应的嵌岩桩竖向承载力理论计算方法,该法计算模式明显有别于传统桩基规范算法.工程算例对比分析结果表明,该方法计算值比桩基规范传统算法计算值更接近于现场实测静载试验结果.这一算法可为嵌岩桩设计与应用提供新的思路.
근거상법향강도조건하결구면전절역학특성연구감암장적하재전체궤제.고필장–암계면효결작용,제출완정적감암장장–암계면전절궤제,즉포괄효결파배、활동전창급전절활이3부분;근거장–암계면불동전절계단적역학특성,건립완정적장–암계면전절본구방정.기우결구면전절역학특성,종이론상분석감암장장측조력강화효응적산생궤제.연구결과표명,장측조력증강효응재정개장측도유발생,단재장단부근장측최위명현.재궤제분석적기출상,제출고필장측조력강화효응적감암장수향승재력이론계산방법,해법계산모식명현유별우전통장기규범산법.공정산례대비분석결과표명,해방법계산치비장기규범전통산법계산치경접근우현장실측정재시험결과.저일산법가위감암장설계여응용제공신적사로.
Based on the shear mechanical properties of structural plane under condition of constant normal stiffness,the load transfer mechanism of rock-socketed pile was studied. Considering the bond strength of pile-rock interface,a complete shear mechanism of pile-rock interface of rock-socketed pile was proposed, including bond damage,sliding dilatancy and shear slipping. According to the mechanical properties of pile-rock interface in different shear stages,complete shear constitutive equations for pile-rock interface were put forward. On the basis of shear mechanical properties of pile-rock interface,the enhanced effect of skin friction was analyzed theoretically. The results show that the enhanced effect occurs at the whole pile side and is the most distinct in the vicinity of pile tip. Considering the enhanced effect of skin friction,the theoretical formula for vertical bearing capacity of rock-socketed pile was proposed,which is obviously different from the traditional method suggested by specifications. Comparative analysis of case study shows that the vertical bearing capacity calculated by the proposed method is much closer to the field static load test result than the value calculated by the specifications. It provides a new procedure for design and application of rock-socketed piles.