小三轴压缩试验确定内摩擦角的可行性

Feasibility Analyses of Small-scale Triaxial Test in Measuring Internal Friction Angle

由于砂砾石材料的内摩擦角(?)是其力学性能的一个重要参数,为了简单、快速、准确地确定(?),通 过对不同砂砾石粘土配比下混合料的大、小三轴试验的对比分析后认为,大、小三轴试验中所用材料的 级配、试样破坏模式以及试验的影响因素等存在较大的差异,但最终的试验结果均呈现出小三轴试验所 得(?)值比大三轴试验所得(?)值大3～5°,在此基础上提出了由小三轴试验测试结果预测大三轴试验测试结 果的数学模型,通过分析,该模型能较好地反映砂砾石混合料真实的(?)值。试验测试及模型预测结果的 一致性表明,通过小三轴试验确定砂砾石混合料的内摩擦角是可行的。

The internal friction angle of aggregate material is an important mechanic parameter. How this parameter is obtained directly affects the application of aggregate. In this paper, through large and small-scale triaxial tests, we present an analysis of the mixture performance of different aggregate-clay ration. Although the gradation, failure model of the mixture and the factors which influence the test results bear large diversity, the internal friction angle of small-scale triaxial tests are of three to five degree greater than large-scale triaxial tests at all time. Based on above analyses, we then propose a mathematic model, which can predict the parameter of large-scale triaxial tests through small-scale triaxial tests. The prediction results of the model are consistent with the experiment results. We also give the true parameter of the mixture. Our study proves to us that it is feasible to get the internal friction angle of aggregate material through mall-scale triaxial test.