基坑设计考虑粘性土变形局部化的探讨

Studies on design method of excavation considering clay localization

根据上海软土在固结不排水平面应变压缩试验条件下应变局部化和剪切带形成的实测研究结果,发现粘性土剪切带开始形成的偏应力为其屈服点。过此点后粘性土局部化变形加剧。这将有助于土体在强度理论、变形和稳定分析等方面的深入研究。为此,在深入研究变形局部化的同时,着重研究考虑粘性土变形局部化的深基坑计算参数问题。

According to the test results of localization and shear bands formation under the consolidated undrained plane strain compression tests on soft clay in Shanghai, it was found that the deviator stress of shear band beginning to form was very close to its yield point in clay soils. Exceeding this point, the localized deformation became violent on soft clay. The discovery would be helpful to a thorough study on the strength theory, deformation and stability analysis in soils. While making a thorough study on clay localization, the calculated parameters for the design method of deep excavation considering clay localization were emphatically discussed.