循环剪切作用下卵石-碎石复合垫层变形特性试验研究

Experimental Study on Deformation Characteristics of Pebble Gravel-Crushed Aggregate Composite Cushion Under Cyclic Shear Loading

摘要:

为研究卵石-碎石复合垫层在地震荷载下的变形特性，开展了一系列位移控制的大型循环剪切试验，探讨了垫层材料、法向应力、剪切幅值、颗粒破碎、循环剪切次数和剪切方向等因素的影响。结果表明：卵石、碎石在颗粒形态及孔隙率等方面的差异显著影响了垫层的变形特性；由于垫层材料间的相互作用，因此卵石-碎石复合垫层的水平变形和累积法向变形均大于单一材料垫层的变形。

Abstract:

To study the deformation characteristics of pebble gravel-crushed aggregate composite cushion under earthquake loading， a series of large-scale shear tests were carried out， and the effects of cushion material， normal stress， shear amplitude， particle breakage， number of shear cycles， and shear direction were discussed. The experimental results reveal that the differences in physical characteristics such as particle shape and porosity between the pebble gravel and the crushed aggregate will affect the cushion’s deformation characteristics. Due to the interaction between the cushion layers， the horizontal and cumulative normal deformations of the pebble gravel-crushed aggregate composite cushion are larger than that of the single-layer cushion.