坑底饱和粘性土蠕变特性对基坑稳定性影响研究

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。

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

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.