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为研究不同成型方法对不同级配的级配碎石抗变形性能的影响,选取了振动压实法和静压法2种成型方法,悬浮密实结构(GD)和多级嵌挤骨架密实结构(TK)2种不同级配的级配碎石,利用回弹模量表征级配碎石的弹性变形特性,提出了稳定指数(SI)来评价级配碎石的塑性变形特性.采用2种方法成型试件后,在最佳含水量下测定其回弹模量;借鉴沥青混合料车辙试验来研究级配碎石的抗塑性变形能力,根据最大干密度和最佳含水量,按98%的压实度,利用振动压实法和静压法成型级配碎石试件,测定试件含水量为W_0、0.5 W_0和0的动稳定度.研究发现,不同成型方法下级配碎石的弹、塑性变形相差较大,且振动压实法级配碎石回弹模量为静压成型法的1.56~1.77倍,稳定指数为1.52~1.56倍.
In order to study the influence of different forming methods on the anti-deformability of graded macadam with different grading, two forming methods of vibration compaction method and static pressure method were selected, the dense structure of suspended structure (GD) TK) were used to evaluate the elastic deformation characteristics of gradation gravel, and the stability index (SI) was put forward to evaluate the plastic deformation characteristics of the graded macadam.Using two methods After forming the specimen, the modulus of elasticity was measured at the optimum water content. The asphalt mixture resistance test was used to study the resistance to plastic deformation of the graded aggregate. According to the maximum dry density and the optimum water content, 98% Compaction degree, vibrating compaction method and static pressure method were used to form the graded broken stone specimen, and the dynamic stability of the specimens was measured with the water content of W_0,0.5 W_0 and 0. It was found that under the different forming methods, The elastic and plastic deformations are quite different. The elastic modulus of vibratory compaction graded gravel is 1.56-1.77 times that of hydrostatic forming method, and the stability index is 1.52-1.56 times.