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设计软黏土中单桩模型箱试验,模拟了桩周土逐级加荷沉降,通过量测超孔隙水压力、土体沉降及桩身轴力变化,分析了软黏土进入次固结阶段时,桩侧负摩阻力及桩身中性点位置变化情况。研究表明,在次固结阶段桩周土所产生的沉降对桩侧负摩阻力仍具有一定影响,沿桩身呈先增大后减小的趋势;当桩周土所施荷载等级达到一定程度时,桩身中性点位置将随着桩周土次固结时间的增长而逐渐上移。次固结阶段产生的沉降量与土体上所施加的荷载等级有关,随着桩周土荷载等级的增大,次固结阶段产生的沉降所占总沉降的比例逐渐减小,其蠕变效应逐渐减弱。
The single-pile model box test in soft clay was designed to simulate the step-by-step loading and settlement of the soil around the pile. By measuring the excess pore water pressure, the settlement of soil mass and the axial force of the pile body, Pile negative friction and pile neutral point position changes. The results show that the subsidence caused by subsoil consolidation has negative influence on the negative friction of the pile side and increases first and then decreases along the pile body. When the load level reaches a certain extent , The position of the neutral point of the pile will gradually move up with the increase of soil consolidation times. The subsidence settlement is related to the load level applied on the soil. As the load level of the soil around the pile increases, the proportion of the total subsidence caused by the sub-consolidation phase decreases gradually, and the creep Effect gradually weakened.