桩基础边载作用会在桩周产生负摩阻力,进而危及软土地区高桩码头、人工岛、路基等工程的安全.通过开展黏土中单侧堆载作用下单桩室内模型试验,测定桩身应变、桩顶沉降和水平位移,研究边载作用距离和桩型对桩身轴力及弯矩的影响,探讨桩身负摩阻力、桩顶沉降和水平位移在黏土固结过程中的时间效应.结果表明:边载作用距离对桩身最大轴力和最大弯矩有较大影响;翼板桩会增加桩身最大轴力和最大弯矩;负摩阻力和有效应力系数随时间增长且增速趋缓;增加边载作用距离和添加翼板都会提升桩身中性点位置,在这两组试验中均提升了8.33％.%Pile foundations in soft soil often suffer negative skin friction due to a bigger settlement of soil than piles,such as piles in standing pile wharfs,artificial islands and road foundations.Model experiments of single pile in soft soil under lateral surcharge load are conducted.Strain gauges and dials are located to measure the stress in pile and the settlement or horizontal displacement of pile top.Negative skin friction and bending moment along pile as well as their changing during consolidation are studied.The consequences are as below:the distance of lateral surcharge load has a great influence on the maximum bending moment and the maximum axial force of pile;negative skin friction and the effective stress coeffcient keep increasing during the test and the rate slows down;pile with wings and pile away from the surcharge load both have higher neutral points,and in this test,they are 8.83％ higher.
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