CAJ | 학술논문

嵌岩桩桩–岩界面受力剪切机制通常包括滑动剪胀及剪切滑移两部分,滑动剪胀导致桩–岩界面法向应力显著增大.Serrano法计算嵌岩桩侧摩阻力没有考虑桩–岩界面剪胀效应的影响,从而使得其计算结果比现场实测值偏保守.基于常法向刚度(CNS)条件下结构面剪切力学特性,充分考虑岩性、桩径以及施工等因素对嵌岩桩受力特性的影响,在对既定粗糙度结构面剪胀产生的法向应力增量实现量化分析的基础上,通过耦合结构面剪胀对Serrano法进行修正.计算结果表明,修正的Serrano法计算所得嵌岩桩侧摩阻力明显高于Serrano法,也更接近于现场实测.修正的Serrano法完善嵌岩桩侧摩阻力的理论计算.
감암장장–암계면수력전절궤제통상포괄활동전창급전절활이량부분,활동전창도치장–암계면법향응력현저증대.Serrano법계산감암장측마조력몰유고필장–암계면전창효응적영향,종이사득기계산결과비현장실측치편보수.기우상법향강도(CNS)조건하결구면전절역학특성,충분고필암성、장경이급시공등인소대감암장수력특성적영향,재대기정조조도결구면전창산생적법향응력증량실현양화분석적기출상,통과우합결구면전창대Serrano법진행수정.계산결과표명,수정적Serrano법계산소득감암장측마조력명현고우Serrano법,야경접근우현장실측.수정적Serrano법완선감암장측마조력적이론계산.
The shear mechanism of pile-rock interface of rock-socketed pile includes sliding dilatancy and shear slipping;the sliding dilatancy causes the normal stress increase significantly. The method for calculating the side friction of rock-socketed pile proposed by Serrano did not consider the effect of pile-rock interface dilatancy, which makes it more conservative than the measured value. Based on the results of the structural plane shear tests under constant normal stiffness(CNS) condition,which fully consider the effect of lithology,pile diameter and construction on the mechanical characteristics of rock-socketed piles,and the quantified values of the normal stress increment produced by dilatancy are achieved;then Serrano′s method is modified by considering the quantified normal stress increment values. The analytical results show that,the side friction values calculated by the modified method exceed the values calculated by Serrano′s method;and the former are also closer to the field measured values. It is confirmed that the modified Serrano′s method is more reasonable.