有压单向冻结橡胶加筋膨胀土的动力特性研究

Waste rubber has been widely used in geotechnical engineering and environmental geological engineering, and many scholars have used waste rubber for soil improvement. However, rubber-reinforced expansive soils have morc complcx mechanical properties, especially in terms of its dynamic characteristics, which remain unexplored. In this paper, the effects of freezing temperature and rubber particle size on the dynamic properties of rubber-reinforced expansive soil under confining pressure are investigated by using self-developed temperature-controllcd dynamic triaxial equipment. The results show that; (1) Under confining pressure, the dynamic shear modulus tends to increase and then decrease with decreasing temperature. When T= —12 °C, the dynamic shear modulus reaches the maximum. (2) With the increase of rubber particle size under the same mixture, the negative temperature for the maximum dynamic shear modulus of rubber-reinforced expansive soil also increases. When the particle size is 0. 25 mm, the maximum dynamic shear modulus appears at —4 °C, and when the particle size is 0. 43 mm, it appears at —8 °C. (3) When the rubber particle size decreases from 2 mm to 0.18 mm, and the range of linear elastic phase of rubber reinforced expanded soil stress-strain curve increases slightly, and the range of linear elasticity increases by 0.283%.