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首页> 外文期刊>Geotechnical testing journal >Modification to Radial Strain Calculation in Rock Testing
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Modification to Radial Strain Calculation in Rock Testing

机译：岩石测试中对径向应变计算的修改

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The complete uniaxial or triaxial stress-strain behavior of a rock sample can be achieved in compressive testing using a servo-controlled testing system. Initially, the load-deformation data is recorded during an experiment, and then to eliminate the scale dependency of force, this data are converted to the stress-strain curve for final reporting. It has been found that because of the particular design of the current sample instrumentation system used to measure the circumferential or lateral deformation during the uniaxial or triaxial compressive tests, a modification is required to be included in the conventional method of radial strain calculation. As a result, a new analytical solution has been developed to improve the accuracy of the radial strain calculation. The modification procedure differs depending on whether the test-sample diameter is greater or less than 50 mm. A comparative study was conducted based on visual observation and quantitative analysis to show the variation in a number of rock parameters including elastic modulus, Poisson's ratio, peak stress, critical strain, residual stress strain, softening fracture energy, and residual stress when this modification was implemented. For a 50-mm-diameter sample, which is the suggested size for rock testing according to the International Society for Rock Mechanics, the effect of this modification on the parameters obtained from the post-peak region, such as critical strain, residual stress strain, and softening fracture energy varied from 5 % to 9 %. It was concluded that the impact of this modification procedure is more significant with smaller-diameter samples used in rock testing.
机译：岩石样品的完整单轴或三轴应力应变特性可以通过使用伺服控制的测试系统进行压缩测试来实现。最初，在实验过程中记录了载荷-变形数据，然后为了消除力的比例依赖性，将该数据转换为应力-应变曲线以进行最终报告。已经发现，由于用于在单轴或三轴压缩测试期间测量周向或横向变形的当前样本仪器系统的特殊设计，在传统的径向应变计算方法中需要进行修改。结果，开发了一种新的分析解决方案以提高径向应变计算的准确性。根据试样直径是大于还是小于50 mm，修改程序会有所不同。在目视观察和定量分析的基础上进行了一项比较研究，以显示当修改后的岩石参数包括弹性模量，泊松比，峰值应力，临界应变，残余应力应变，软化断裂能和残余应力在内的许多岩石参数的变化。已实施。对于直径为50毫米的样品（这是根据国际岩石力学学会建议的岩石测试建议的尺寸），此修改对从峰后区域获得的参数（例如临界应变，残余应力应变）的影响，软化断裂能从5％到9％不等。结论是，对于岩石测试中使用的较小直径的样本，此修改过程的影响更为显着。

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