临近斜坡静压沉桩过程中边坡动态稳定性研究

发布时间：2018-04-11 02:12

本文选题：修正剑桥模型 + 动态稳定性　；参考：《结构工程师》2017年01期

【摘要】：基于Bishop圆弧滑动法,根据坡顶静压沉桩过程中桩端阻力、桩身摩阻力对边坡的反作用及沉桩过程中桩周土体强度的变化,并考虑桩体通过边坡潜在滑动面后的抗剪力,提出了静压沉桩过程中边坡动态稳定性的计算方法。结果表明:静压沉桩过程中边坡稳定安全系数随桩入土深度的增加而逐渐减小,当桩端到达边坡潜在滑动面时其安全系数最小,随后由于桩的抗剪力,边坡稳定安全系数显著增大,且逐步趋于稳定。压桩过程中产生的桩端和桩身对边坡的作用力是造成边坡稳定性降低的重要因素;土体超固结比和有效内摩擦角越大,沉桩过程中边坡稳定安全系数越大;桩径越大、桩间距越小,边坡稳定安全系数变化幅度越大。
[Abstract]:Based on Bishop circular arc sliding method, according to the reaction of pile tip resistance and pile body friction to slope and the change of soil strength around pile during pile driving, the shear resistance of pile body passing through the potential sliding surface of slope is considered.The calculation method of slope dynamic stability in the process of static pressure piling is put forward.The results show that the safety factor of slope stability decreases gradually with the increase of the depth of the pile in the process of static pressure piling. When the pile tip reaches the potential sliding surface of the slope, the safety factor is the least, and then due to the shear resistance of the pile,The safety factor of slope stability increases significantly and tends to be stable gradually.The force of pile end and pile body on slope is an important factor to reduce slope stability, the larger the overconsolidation ratio of soil and the effective angle of internal friction, the greater the safety factor of slope stability and the bigger the pile diameter, the greater the slope stability safety factor is in piling process, the bigger the slope stability is, the greater the soil overconsolidation ratio is and the more effective internal friction angle is.The smaller the pile spacing, the greater the change of slope stability safety factor.
【作者单位】：同济大学土木工程学院地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金项目(41272288)
【分类号】：TV553

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