关键词: 胶结结构性土, 本构模型, 地基加固, 模拟, 应力集中

Abstract: In the geotechnical engineering, to ensure the safety and stability of soil mass, the Portland cement is often added into soil to form artificially cemented structured soil (improved soil), which is widely used in the improvement of mechanical properties of poor soils. In this paper, the finite element program using the cemented soil constitutive model is used to simulate the soil improvement process. Although the cementation at the bottom of the footing area can improve the bearing capacity of the foundation soils, the stress concentration phenomenon will occur, and the safety of the foundation system cannot be well guaranteed. The effect of the cementation in the distance away from the footing is limited. The suitable area under the bottom of footing is selected for cementation improvement. The soil layer between the footing and the cementation reinforcement area can act as a “cushion”. This cushion transfers the footing pressure to the cementation improvement area more evenly. In this way, the cementation within the improved area can be maximized. The bearing capacity of the foundation can be significantly improved. The safety of the footing is warranted even if the foundation is more deep embedded.

Key words: Cemented Structured Soil, Constitutive Model, Soil Improvement, Simulation, Stress Concentration