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长期以来,很多学者在土的强度问题方面做了大量的研究工作,也取得了不少成果。但土的结构性对强度的影响一直是这一问题的难点。以土的颗粒连接为基本点,建立了土结构强度模型,并对其进行分析,发现土体的强度直接与颗粒之间的连接强度和连接的分布形态有关。将统计域上形成的应力强度曲线族,当作宏观分析的土体性能的代表点考察时,可以自然地得到多个曲面构成的屈服面。通过对简化的土结构形态例子的分析,当各方向的连接为均匀分布时,可以得到各向同性的应力强度模型。分析表明,当考虑到统计域的空间特性时,宏观应力在统计域上不同的局部坐标位置,会出现应力梯度对强度产生影响的现象,这是过去的经典理论中所无法解释的。由此可知,土体结构强度模型是一种分析具有结构性土体的新的、有效的方法。
For a long time, many scholars have done a great deal of research work on the strength of soil and have made many achievements. However, the structural strength of earth has always been a challenge to this problem. Taking the connection of soil particles as the basic point, the soil structural strength model was established and analyzed. It was found that the strength of the soil was directly related to the strength of the connection between the particles and the shape of the connection. When the stress intensity curve family formed on the statistical domain is considered as the representative point of the soil properties for macro analysis, the yield surface composed of multiple curved surfaces can be naturally obtained. By analyzing the simplified example of soil structure, the isotropic stress intensity model can be obtained when the connection in all directions is uniform distribution. The analysis shows that when taking into account the spatial characteristics of statistical domains, the phenomenon that the stress gradient affects the intensity of macro-stress in different local coordinate positions in the statistical domain may not be explained by the classical theory in the past. From this we can see that the soil structure strength model is a new and effective method for analyzing structured soils.