Influence of Number of Pebble Fracture Surfaces on Direct Shear Properties of Aggregates
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摘要:
为了研究道砟颗粒的破碎面数目对道床直剪性能的影响规律，首先，对光滑的河卵石进行破碎，得到拥有不同破碎面数量的道砟集料；其次，针对以上工况在不同垂向应力下开展直剪试验，得到剪切过程中道砟集料的应力应变关系和变形特性；最后，通过公式计算，得出道砟集料的峰值抗剪强度与内摩擦角随垂向应力的变化规律. 研究结果表明：在强度特性方面，道砟破碎面数量为0、1、2、3个时，同一垂向应力下道砟集料的剪切强度和内摩擦角在一定范围内会随着道砟破碎面数量的增加而增加，剪切强度依次提升了14.7%～25.6%、12.2%～27.4%、6.0%～10.1%；对于变形特性，道砟集料的剪缩特性会随着破碎面数目的增加而增加，最大增加了76.4%，而剪胀特性会随着破碎面数目的增加而减少，最大减少了20.8%.
Abstract:In order to investigate the influence of the number of ballast particle fracture surfaces on the direct shear performance of the ballast bed, pebbles were crushed to obtain ballast aggregates with different numbers of fracture surfaces. Direct shear tests were carried out under different vertical stresses to obtain the stress–strain relationship and deformation characteristics of ballast aggregates. Based on formula calculation, the variation laws of peak shear strength and internal friction angle of ballast aggregates with vertical stress were obtained. The results show that, in terms of strength characteristics, when the number of fracture surfaces is 0, 1, 2, and 3, the shear strength and internal friction angle of ballast aggregates under the same vertical stress increase with the number of fracture surfaces. The shear strength increases by 14.7%–25.6%, 12.2%–27.4%, and 6.0%–10.1%, respectively. In terms of deformation characteristics, the shear shrinkage of ballast aggregates increases with fracture surface number, with a maximum increase of 76.4%, while the shear dilation decreases with a maximum decrease of 20.8%.
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Key words:
- ballast /
- fracture surface /
- direct shear test /
- shear characteristic
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图 3 破碎面数量分别为0、1、2、3个的道砟试样
Figure 3. Ballast samples with fracture surface numbers of 0, 1, 2, and 3
表 1 AREA4道砟级配推荐
Table 1. Recommended ballast gradation of AREA4
尺寸/mm 50.00 37.50 25.00 18.75 过筛率/% 100 90～100 20～25 0～15 
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表 2 直剪试验不同工况下的最大剪缩剪、胀量
Table 2. Maximum shear shrinkage and dilation under different conditions in direct shear tests
mm 垂向压力/kPa 最大剪缩量 最大剪胀量 0 1 个破碎面 2 个破碎面 3 个破碎面 0 1 个破碎面 2 个破碎面 3 个破碎面 50 0.058 0.082 0.130 0.158 14.310 14.235 13.160 12.350 100 0.086 0.120 0.200 0.266 13.310 12.810 10.145 9.155 200 0.180 0.212 0.374 0.478 9.870 9.680 9.440 8.520
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