中文核心期刊
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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2023, Vol. 42 ›› Issue (6): 62-71.DOI: 10.3969/j.issn.1674-0696.2023.06.09

• 交通基础设施工程 • 上一篇    

不同配比土石混合体压实特性及颗粒破碎特征研究

马丽娜1,2，乔丹阳1，王起才1,2，段运1，郭杰3   

  1. (1. 兰州交通大学 土木工程学院，甘肃 兰州 730070； 2. 兰州交通大学 道桥工程灾害防治技术国家地方联合工程实验室， 甘肃 兰州 730070； 3. 甘肃省公路交通建设集团有限公司，甘肃 兰州 730070)
  • 收稿日期:2021-09-27 修回日期:2021-12-24 发布日期:2023-08-01
  • 作者简介:马丽娜（1985—），女，陕西渭南人，副教授，博士，主要从事岩土力学及隧道工程方面的研究。E-mail：malina198546@126.com 通信作者：乔丹阳（1995—），男，陕西渭南人，硕士研究生，主要从事岩土力学方面的研究。E-mail：1412041768@qq.com
  • 基金资助:
    长江学者和创新团队发展计划滚动资助项目(IRT-15R29)；陇原青年创新人才(团队)项目(201812)；甘肃省教育厅产业支撑计划项目(2021CYZC-28)

Compaction Characteristics and Particle Crushing Characteristics of Soil-Rock Mixtures with Different Proportions

MA Lina1,2, QIAO Danyang1, WANG Qicai1,2, DUAN Yun1, GUO Jie3   

  1. (1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China; 2. National and Local Joint Engineering Laboratory of Road and Bridge Engineering Disaster Prevention Technology, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China; 3. Gansu Highway Traffic Construction Group Co., Ltd., Lanzhou 730070, Gansu, China)
  • Received:2021-09-27 Revised:2021-12-24 Published:2023-08-01

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摘要： 为探讨土石混合体填料的压实特性及击实后混合体内部的颗粒破碎程度，在室内进行了不同含石量(P5)的击实试验及颗粒破碎试验。研究结果表明：当P5含量不变时，改变细粒料组成成分及比例对最优含水率的影响较最大干密度更明显；不同级配下土石混合体试样的初始含石量是影响颗粒破碎的关键因素；击实前后颗粒级配曲线所围成的面积可以表征粒径变化程度，粒径发生变化的主要区间为2.5~20 mm，且粒径变化大小程度随着粒径减小呈递减小趋势；击实后分形维数与最大干密度和最优含水率有良好的拟合关系，最优含水率对击实后分形维数的影响较最大干密度更为显著；根据分形理论，击实后的分形维数较击实前均增大，且击实前后分形维数的差值与破碎指标都能够在某方面表征混合体的颗粒破碎程度；混合体的相对分形维数随着含石量的增加而增大，即相对分形维数越大，颗粒破碎程度越大。

关键词: 岩土工程；土石混合体；击实试验；细颗粒料；分形维数；颗粒破碎

Abstract: In order to explore the compaction characteristics of the soil-rock mixture filler and the degree of particle crushing inside the mixture after compaction, the compaction tests with different rock content (P5) and particle crushing tests were carried out indoors. The research results show that, as the P5 content remains unchanged, changing the composition and proportion of fine-grained materials has a more significant impact on the optimal moisture content than the maximum dry density does. The initial rock content of the soil-rock mixture samples with different gradations is the key factor affecting particle crushing. The area enclosed by the particle grading curve before and after compaction can represent the degree of particle size change. The main range of particle size change is 2.5~20 mm, and the degree of particle size change shows a gradually decreasing trend as the particle size decreases. The fractal dimension after compaction has a good fitting relationship with the maximum dry density and the optimal moisture content. The optimal moisture content has a more significant effect on the fractal dimension after compaction than the maximum dry density does. According to the fractal theory, the fractal dimension after compaction is larger than that before compaction, and the difference between the fractal dimension before and after compaction and the crushing index can characterize the particle crushing degree of the mixture in a certain way. The relative fractal dimension of the mixture increases with the increase of the stone content, namely, the greater the relative fractal dimension, the greater the degree of particle crushing.

Key words: geotechnical engineering; soil-rock mixture; compaction test; fine-grained material; fractal dimension; particle crushing

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