土结构强度模型研究

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。

Study of strength model of soil structure

Many scholars have performed a large amount of researches on soil strength with considerable achievements. But the influence of soil structure on its strength has always been the difficult point. A soil structure strength model is established based on soil particle connection. From the analysis of this soil structure model established, it is found that the strength of soil mass is directly associated with the connection strength among particles and the distribution pattern of connections. When the stress-strength curve family in statistical domains is used to macroscopically analyze the soil mass properties, the yield surface composed of several curved surfaces can be gained. The analysis of examples of simplified soil structure morphology indicates that an isotropic stress-strength model can be obtained when the connection in each direction is evenly distributed. In addition, when the spatial characteristics of statistical domains are considered, for different local coordinates of macroscopic stress in the statistical domain, the stress gradient may influence the soil strength. This is exactly what the classical theories can not explain. Therefore, the strength model of soil structure being established is a kind of new and effective analysis method for structural soil.