The mechanical behaviour of rockfill materials and aggregates depends, not just on particle size and compaction, but mainly on their strength and lithological properties. In this research two types of large triaxial and direct shear tests are performed on rockfill materials. This Paper compares the stress-strain laboratories tests; behaviour of sandstone and andesibasalt materials in triaxial compression tests (300 x 600mm) and direct shear tests (300 x 300mm). The study evaluates two kinds of aggregates showing different lithological properties and the result revealed that how the same particle sizes aggregates behave differently due to different lithology and test procedures. The results in this research show that shear strength of hard and strong rockfill mass (andesibasalt) is more, and the deformability is less, compared to weaker rockfill materials (sandstone), and this variation increases with increasing confining stress and surcharge.
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机译：岩石材料和聚集体的力学行为取决于粒度和压实，但主要是它们的强度和岩性特性。在本研究中，在堆石材料上进行两种类型的大型三轴和直接剪切试验。本文比较了应力 - 应变实验室试验;三轴压缩试验中砂岩和安培施材料的行为（300 x 600mm）和直接剪切试验（300 x 300mm）。该研究评估了两种聚集体，显示出不同的岩性特性，结果表明，由于不同的岩性和测试程序，相同的粒度尺寸聚集体的表现不同。该研究的结果表明，与较弱的岩石材料（砂岩）相比，硬质和强大的岩石质量（Andesibasalt）的剪切强度更大，并且变形性较少，并且这种变化随着限制的压力和附加费而增加。
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