红黏土在卸荷状态下的力学特性试验研究

选取工程中常见的3种应力路径,进行不同稠度状态的原状及重塑红黏土的力学特性试验,以研究在不同稠度状态下结构性红黏土在侧向卸荷条件下的变形破坏特性。通过将卸荷比的概念应用于贵州红黏土进行红黏土在卸荷开挖状态下其卸荷比与变形关系的研究,研究结果表明:初始卸荷比可以很好地描述红黏土剖面在不同应力路径下的变形破坏特征。不同含水率、不同应力路径和不同固结围压下红黏土的初始卸荷比有很大的规律性及差异性,其与红黏土的变形具有密切的联系,可以用来作为一种研究手段建立和描述红黏土在工程中的受力变形破坏规律。

Experimental Study on the Relationship between Unloading Ratio and Deformation of Red Clay under Excavation Unloading

In order to study the deformation and failure characteristics of structural red clay under lateral unloading, three common stress paths are selected to test the mechanical properties of red clay in different consistency states and remolded red clay. The concept of unloading ratio is applied to Guizhou red clay for the first time. The results show that the initial unloading ratio can well describe the deformation and failure characteristics of red clay profile under different stress paths. The initial unloading ratio of red clay under different moisture content, different stress path and different consolidation pressure has great regularity and difference, which is closely related to the deformation of red clay. It can be used as a research method to establish and describe the deformation and failure law of red clay in engineering.