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首页> 外文期刊>Bulletin of engineering geology and the environment >Assessment of basic friction angles of various rock types from Turkey under dry, wet and submerged conditions and some considerations on tilt testing
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Assessment of basic friction angles of various rock types from Turkey under dry, wet and submerged conditions and some considerations on tilt testing

机译：在干燥，潮湿和淹没条件下评估来自土耳其的各种岩石的基本摩擦角以及倾斜测试的一些注意事项

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The shear strength of discontinuities has a prime importance in the assessment of structurally controlled stability problems. Natural discontinuity surfaces are usually not smooth and show irregularities, which have an important effect on their shear strength. The peak shear strength of natural, unfilled, rough discontinuities is estimated by a non-linear failure criterion and one of the main inputs of this criterion is the basic friction angle, which is determined via a tilt test or direct shear test. The limited number of studies on tilt testing and the need to develop a standard and/or suggested method for estimating a reliable basic friction angle value from tilt tests have given rise to some recent research efforts on different aspects of this test. In this study, an attempt was made to contribute to previous works on the tilt test with the aid of an experimental program on a wide range of rock types. The study mainly focused on investigating the dependence of the basic friction angle on different testing conditions (dry, wet and submerged), the suitable number of tests (repetitions of sliding on the same surface) which does not cause a wear effect, and a more detailed assessment on the influence of water head on the basic friction angle determined under submerged conditions. Additional considerations in the study include a general evaluation of the influence of the testing surface's mineralogical composition on test results. For this purpose, 22 different rock types were collected from different parts of Turkey and their mineralogical compositions were determined via a total of 415 tilt tests under three different conditions. The results obtained from the experimental studies are presented and compared with the results of previous studies and some recommendations are made.
机译：不连续的剪切强度在评估结构控制的稳定性问题中具有最重要的意义。自然的不连续表面通常不光滑且显示不规则性，这对它们的剪切强度有重要影响。自然的，未填充的，粗糙不连续的峰值剪切强度是通过非线性破坏准则估算的，该准则的主要输入之一是基本摩擦角，该基本摩擦角是通过倾斜试验或直接剪切试验确定的。关于倾斜测试的研究数量有限，需要开发一种标准和/或建议的方法以根据倾斜测试估算可靠的基本摩擦角值，这引起了对该测试不同方面的一些最新研究工作。在这项研究中，尝试通过对各种岩石类型的实验程序，为以前的倾斜测试工作做出贡献。该研究主要致力于调查基本摩擦角对不同测试条件（干，湿和浸没）的依赖性，合适的测试次数（在同一表面上重复滑动）而不会造成磨损的影响，等等。详细评估水头对淹没条件下确定的基本摩擦角的影响。研究中的其他考虑因素包括对测试表面的矿物成分对测试结果的影响的总体评估。为此，从土耳其不同地区收集了22种不同的岩石类型，并通过在三种不同条件下进行的总共415次倾斜测试确定了它们的矿物组成。介绍了从实验研究中获得的结果，并将其与以前的研究结果进行了比较，并提出了一些建议。

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