坑底饱和粘性土蠕变特性对基坑稳定性影响研究

study on the influence of saturated clay creep in pit bottom on foundation pit stability

通过对基坑底饱和粘性土蠕变特性的研究,提出了考虑被动土体的水平基床比例系数随时间指数衰减的模型.结合某工程实例,分析了在饱和粘性土的影响下围护墙的变形与坑底暴露时间的关系,结果表明:在坑底暴露期间,墙体的最大位移位于开挖面附近,暴露21天内,围护桩的位移和弯矩增长速度较为明显,21天后位移和弯矩的增长趋于稳定。

Based on the study of the creep property of saturated clay soil in the foundation pit bottom , the model of horizontal base bed scale coefficients exponential decay over time with the passive soil was put forward .Take an engineering for a example , the relationship be-tween the deformation of retaining wall under the saturated clay and the time of foundation pit bottom exposure is studied , and the results show that：during the period of exposure , the maximum displacement wall is located near excavated plane , retaining piles displacement and moment growth rate is obvious within 21 days of exposing , while displacement and moment of growth remained stable after 21 days.