高应力下砂土与钢材界面单剪试验研究

Mechanical Behavior of Interface Between Sand and Steel in Simple Shear Tests Under High Normal Stress

疏排水沉降引起的竖直附加力导致了华东地区多个立井井筒破裂,高应力下土与结构界面剪切特性研究是解决这一工程问题的关键。在自行加工、改造的高应力单剪仪试验系统上进行了一系列单剪试验。试验数据分析表明高应力下砂土同钢材界面剪应力-剪切位移关系可用非线性弹性—理想、塑性本构关系描述;高应力下界面的强度准则符合无粘聚力的莫尔-库仑公式表示。

Vertical additional force outside surface of the shaft lining caused by dewatering settlement of bottom aquifer in the thick alluvium induced shaft fracture in east china. The study on sheafing property of interface between soil and structure under high stress is key to solve this engineering problem. A series simple shear tests about interface were carried out on the manufactured, modified simple shear system under high stress. The analysis of testing data demonstrates that the relationship of stress and shearing displacement can be described as nonlinear elastic-ideal plastic model, and that the strength criterion of interface accords with Mohr-Coulomb through origin.