研究目的: 为研究土体蠕变特性对深基坑围护结构稳定性的影响，本文基于深圳某车站深基坑工程，通过室内三轴蠕变试验，运用数值模拟方法拟合得出了土体蠕变引起的基坑开挖时间敏感性，以及对周边建筑物带来的不利影响。
研究结论: 通过对典型断面的数值模拟，重点阐述了深圳地区特定土体的蠕变特性，为本工程的安全施工、保护周边环境及预测长期变形提供了理论基础。蠕变前后支护结构变形增大近 16%，临近建筑物基础沉降增大了近 21%; 得出的具有适用性的 SSC 模型计算参数，对本地区类似基坑工程具有较高的参考价值。
Research purposes: Combined with the deep foundation pit project of one railway station in Shenzhen，by doing indoor triaxial creep test，the time sensitivity of the foundation pit excavation and the negative influence on the surrounding building caused by the soil creep were fitted with numerical simulation method for purpose of researching the influence of soil creep characteristics on the stability of the exterior － protected construction for the foundation pit．
Research conclusions: Through numerical simulation of the typical section，the introduction was given mainly to the creep characteristics of the soil in Shenzhen area for providing the theoretical basis for the safe construction，protection of the surrounding environment and prediction of long － term creep． Before and after creep，the deformation of the supporting structure increased by 16% and the base settlement of the near building increased by about 21% ． At the same time，the more usable calculation parameters for SSC model were obtained and it had the big reference value for the similar works．
PDF(728 KB)
