关键词: 胶结土, 力学特性, 状态相关

Abstract: A certain amount of cementitious material is mixed into the soil to form a structural artificial cemented soil, which could be widely used in the improvement of geomaterials. However, the existence of this structure makes the cemented soil demonstrates complex mechanical behaviors, so it is of great significance to quantitatively analyze the mechanical behavior of the cemented structural soil. This paper presents a case history of evaluating the mechanical behavior of the cemented soil. The test system analyzes the state dependence of the mechanical properties. The results show that: (1) Under the same confining pressure, the cemented soil with a relatively small void ratio shows more and more strain softening phenomenon during the shear process, and with the increase of the consolidation confining pressure, it gradually transitions to the strain hardening, which implying that the cemented soil is suitable for the shallow reinforcement; (2) The isotropic consolidation curves of the cemented soil and the remolded soil within 0~1500 kPa all showed different degrees of bending, among which the remolded soil was the most significant, and the less obvious the cemented soil with relatively small void ratio, indicating that the existence or strength of the cementing force significantly affected the isotropic compression characteristics of the soil; (3) The residual strength of the cemented soil and the slope of the critical strength line are less affected by the initial state quantity (void ratio, cementation), so they are considered to be a mechanical parameter independent of the intrinsic state.

Key words: Cemented Soil, Mechanical Characteristics, State-Dependency