吸附力是港口工程和海洋工程中常见的一种力.然而国内外的试验研究,只是把吸附力作为一个整体来研究,未能分析负孔压和黏着力各自的影响因素以及它们之间的相互影响.为此通过模型试验,对拉拔速率和上覆荷载等因素进行研究,明确负孔压和黏着力各成分的大小及其发展变化规律.实验结果表明,土体在受压和受拉时,圆形均布荷载中心点下的孔隙水压力分布满足附加应力计算公式.在相同含水率下,当拉拔速率较小时,随着拉拔速率的增加,吸附力增速逐渐变大;当速率超过一定值后,吸附力增速逐渐放缓.拉拔过程中,土体位移影响着负孔隙水压力的发展,位移越大,负孔隙水压力越大;位移越小,负孔隙水压力越小.吸附力和负孔压的发展随着时间成线性正相关,黏着力随着时间先增加后减小.%The suction is a common load in port engineering and marine engineering. It is usually studied as a whole by experiments and the influence factors and the interaction of negative pore pressure and adhesion are not studied completely. Therefore, the influence factors of uplift speed and overburden load on suction were studied by model test in order to determine the value and development rule of negative pore pressure and adhesion. Test results show that the distributions of pore water pressure of soils below the center of circular foundation under compressing and pulling load conform the calculated results of additional stress. The suction increases with the increase of uplift speed and the increasing rate decreases when uplift speed exceeds certain value. The negative pore pressure devel?ops with the displacement of soils. Both suction and negative pore pressure increase with time and adhesion increas?es first and then decreases with time.
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