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使用自主研发的土与结构物相互作用试验仪进行室内土单元试验,分别在土体只受自重应力、土体受大小不同的竖向应力、结构物不同粗糙度、结构物不同位移速率等4种不同的工况下使土体与结构物相互作用。应用颗粒流离散元程序——PFC2D对土与结构物在不同应力条件下相互作用的试验进行数值模拟,研究土与结构物相互作用时接触面的土体变形及剪应力的变化情况。分析得出土与结构物相互作用时,在土与结构物的接触面上,形成了一定厚度的剪切带,说明土与结构物的相互作用并不只局限于接触面,而对接触面以上一定厚度内的土体也有影响,但影响范围不大,约为10倍的粒径。土与结构物相互作用时,土体会呈现出剪胀及应变软化现象,土体所受剪应力会出现应力峰值。随着竖向应力的增加,土的应力峰值也会升高。结构物的粗糙程度对土体剪应力的变化影响不大。结构物位移速率越大,土体剪应力变化越快。
The indoor soil unit test was conducted by using the soil-structure interaction tester developed independently. The vertical stress, the different roughness of the structure, the different displacement rate of the structure, Under different conditions, soil and structure interact. Particle flow discrete element program, PFC2D, is used to simulate the soil-structure interaction under different stress conditions to study the soil deformation and shear stress at the contact surface between soil and structure. When the interaction between soil and structure is analyzed, a certain thickness of shear zone is formed on the contact surface between soil and structure, which shows that the interaction between soil and structure is not limited to the contact surface but above the contact surface The thickness of the soil also have an impact, but the impact is not large, about 10 times the size. Soil interaction with the structure, the soil will show dilatancy and strain softening phenomenon, the soil subjected to shear stress stress peaks occur. With the vertical stress increases, the soil stress peak will rise. The roughness of the structure has little effect on the change of soil shear stress. The greater the displacement rate of structure, the faster the change of soil shear stress.