多种空间滑动面及其强度准则对结构性黄土的适应性分析

结合不同结构性原状黄土的真三轴试验,开展多种空间滑动面上强度变化规律的研究,分析不同动态空间滑动面准则对不同结构性原状黄土强度的适应性。从反映复杂应力对空间滑动面的影响及空间滑动面可能存在变化范围角度出发,在分析已有强度准则空间滑动面的基础上,进一步提出考虑微结构特征的空间滑动面,建立其相应的强度准则。通过分析几种不同结构性原状黄土在各个动态空间滑动面上的抗剪应力和法向应力关系,结果表明,两种动态空间滑动面随着剪切应力的变化其法向也在变化,这更能反映土剪切过程中剪切面的不断变化。两种动态空间滑动面准则都能一定程度上反映不同结构性原状黄土的破坏。与不同结构性黄土的强度变化规律比较,表明3■σ动态空间滑动面强度准则更适合描述不同结构性黄土的强度规律。

Adaptability analysis of a variety of spatially mobilized plane and its corresponding strength criteria for different structural loess

Combined with the true triaxial tests of different structural undisturbed loess, this paper carried out the strength variation research on a variety of spatially mobilized plane, and the adaptability analysis of a variety of spatially mobilized plane and its corresponding strength criteria for different structural loess. From the perspective of reflecting influence from the complex stress to the spatially mobilized plane and the possible range of the spatially mobilized plane, a variety of spatially mobilized plane which further proposed to consider the micro-structure had been put forward and its appropriate strength criterion also had been established. Through the analysis of relationship between the shear stress and normal stress of several different structural undisturbed loess in different dynamic spatially mobilized plane, the results showed that two dynamic spatially mobilized planes also changed with its normal changing, which better reflected the changing course of the soil shear plane. Two dynamic spatially mobilized plane criteria can reflect the failure of different structural undisturbed loess to certain extent. Compared with the different structural loess, the results showed that dynamic spatially mobilized plane strength criterion is more suitable to describe the strength of different structural loess.