陈乐意, 周立, 吴兵. 考虑时间效应的基坑变形数值分析[J]. 南昌航空大学学报(自然科学版), 2013, 27(3): 87-92,97. DOI: 10.3969/j.issn.1001-4926.2013.09.016
引用本文: 陈乐意, 周立, 吴兵. 考虑时间效应的基坑变形数值分析[J]. 南昌航空大学学报(自然科学版), 2013, 27(3): 87-92,97. DOI: 10.3969/j.issn.1001-4926.2013.09.016
CHEN Le-yi, ZHOU Li, WU Bing. Numerical Analysis of Deformation of Foundation Excavation Considering Influences of Time-effect[J]. Journal of nanchang hangkong university(Natural science edition), 2013, 27(3): 87-92,97. DOI: 10.3969/j.issn.1001-4926.2013.09.016
Citation: CHEN Le-yi, ZHOU Li, WU Bing. Numerical Analysis of Deformation of Foundation Excavation Considering Influences of Time-effect[J]. Journal of nanchang hangkong university(Natural science edition), 2013, 27(3): 87-92,97. DOI: 10.3969/j.issn.1001-4926.2013.09.016

考虑时间效应的基坑变形数值分析

Numerical Analysis of Deformation of Foundation Excavation Considering Influences of Time-effect

  • 摘要: 传统的基坑设计一般只考虑基坑的瞬时变形,但大量的基坑工程实践表明,基坑变形有明显的时间效应。将软土蠕变本构模型和Biot固结理论运用于基坑开挖性状分析中,通过典型算例对比分析了流变、固结对基坑变形的影响。计算结果表明:考虑时间效应与不考虑时间效应的基坑变形规律在开挖初期相近,但随着开挖深度的增大以及时间的推移而逐渐产生差异;考虑流变时,开挖完成后基坑的变形还会随着时间的推移继续增长;考虑固结时,开挖完成后随着时间的推移,土体中由于开挖卸荷所形成的负孔压慢慢消散,基坑逐渐回弹。

     

    Abstract: The traditional design of foundation pit usually only consider the instantaneous deformation of foundation pit. However, a lot of engineering practices show that the deformation has obvious time effect. In this paper, soft soil creep constitutive model and Biot consolidation theory are used to research the behavior of excavation. Through the typical examples, we comparative analyzed the effects of creep and consolidation on foundation pit deformation. The results show that the foundation pit deformation laws of considering time-effect and without considering time-effect are close at the beginning of the excavation. However, with the increase of depth of excavation and march of time, the difference gradually produced. When considering the creep, pit deformation will continue to grow over time after excavation. When considering consolidation, with the march of time after excavation, the foundation pit in the soil rebound gradually because the negative pore pressure formed by the excavation unloading dissipate slowly.

     

/

返回文章
返回