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An experimental investigation on the particle breakage and strength properties of soil-rock mixture
Arabian Journal of Geosciences ( IF 1.827 ) Pub Date : 2021-05-08 , DOI: 10.1007/s12517-021-07186-0
Yiliang Tu , Hejun Chai , Xinrong Liu , Junbao Wang , Bin Zeng , Xiang Fu , Jiayu Yu

The soil-rock mixture (S-RM) is widely used as a kind of geotechnical material in some construction engineering. When analyzing the stability of the engineering, the strength properties of S-RM are used as crucial input parameters. In this paper, to improve the understanding of strength properties of S-RM, a series of large-scale direct shear tests were conducted on S-RM with two volumetric rock block contents (VBCs), each with three types of block lithology. The particle breakage after each test and its relationship with strength properties were also analyzed. The results reveal that the influences of VBC and block lithology on particle breakage are slight when VBC is low, while significant as VBC increases. Compared with the traditional M-C strength criterion, a modified M-C nonlinear strength criterion is more suitable for the S-RM. When VBC is low, the influences of VBC and block lithology on the strength properties are slight. However, when VBC is high, their impacts will become greater, especially on the nonlinear strength parameter Δφ. The nonlinear strength characteristics become more obvious with an increase in relative breakage index Br, which are mainly caused by the particle breakage during the shearing process.



中文翻译:

土石混合料颗粒破碎及强度特性的试验研究

土石混合料(S-RM)在某些建筑工程中被广泛用作一种岩土材料。在分析工程的稳定性时,将S-RM的强度特性用作关键的输入参数。在本文中,为了增进对S-RM强度特性的了解,对具有两种体积岩石块含量(VBC),每种具有三种块岩性的S-RM进行了一系列的大规模直接剪切试验。还分析了每个测试后的颗粒破损及其与强度性能的关系。结果表明,当VBC较低时,VBC和块状岩性对颗粒破裂的影响很小,而当VBC增大时,其影响显着。与传统的MC强度准则相比,改进的MC非线性强度准则更适合S-RM。当VBC较低时,VBC和块岩性对强度性能的影响很小。但是,当VBC很高时,它们的影响将变得更大,尤其是对非线性强度参数Δ的影响φ。相对断裂指数B r的增加,非线性强度特性变得更加明显,这主要是由于剪切过程中的颗粒断裂所致。

更新日期:2021-05-08
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