CAJ | 학술논문

结合湿陷性黄土地区桩基浸水载荷试验实例，对桩基的负摩阻力形成机理进行数值模拟研究，分析桩长、桩顶荷载、地表超载、桩端土模量和固结时间等因素对负摩阻力的影响，得出以下结论：桩顶荷载引起桩体的沉降，桩越短，沉降越大，沉降的速率越快；随着桩顶荷载的增大，中性点明显上移，负摩阻力引起的下拽力减小，其趋势逐渐变缓；随着超载、桩端土模量的增大和固结时间的推移，得出最大负摩阻力数值增大，中性点位置下移，桩身最大轴力增大的一致规律。
결합습함성황토지구장기침수재하시험실례，대장기적부마조력형성궤리진행수치모의연구，분석장장、장정하재、지표초재、장단토모량화고결시간등인소대부마조력적영향，득출이하결론：장정하재인기장체적침강，장월단，침강월대，침강적속솔월쾌；수착장정하재적증대，중성점명현상이，부마조력인기적하예력감소，기추세축점변완；수착초재、장단토모량적증대화고결시간적추이，득출최대부마조력수치증대，중성점위치하이，장신최대축력증대적일치규률。
Negative skin friction (NSF) numerical simulation of pile foundation is carried out combined with pile foundation test instance in collapsible loess area. Some significant factors,such as the length of pile,the load on the top,overload,the soil elastic modulus and consolidation time of pile are analyzed. The results indicate: The shorter of the pile, the faster of the settlement caused by the load on the top of pile increase. The location of neutral point move up evidently, downdrag caused by NSF and decreasing trend becomes gently while working load acting upon the pile increase. Maximal NSF absolute value increase, the location of neutral point move down, maximal axis strength increase when the overload and the soil elastic modulus increase during consolidation time lapsed.