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A study on stress-strain curve of brittle rock under compression

机译：压缩下脆性岩石应力 - 应变曲线研究

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Rock compression testing is a universal laboratory testing method for determining rock elastic modulus, peak strength, Poisson's ratio, etc. For decades, the accuracy and applicability of the testing methods have been researchers' great concern. In this study, uniaxial tests of brittle shale were conducted. Inclination induced by spherically/flatly seated upper loading platen was analyzed. Scanning Electron Microscope (SEM) was used to observe the micro crack tip induced by the non-uniform loading. Taking the inclination of loading platen into consideration, Particle Flow Code 2D was used to simulate non-uniform loading process. Typical post-peak failure was analyzed allowing for load train stiffness and servo response interval, which played a role in the uncontrolled failure process. Conclusion shows that slight inclination of loading platen would lead to highly nonuniform loading. Stress-strain curve of brittle rock post-peak failure showed characteristics of load train stiffness and servo response interval. Conclusion also showed that the insensitivity of axial strain to splitting in UCS testing was the main reason for axial strain rate control mode to give unsatisfactorily control in brittle rock UCS testing. The study here could give a better understanding on rock compression testing and corresponding machine design.
机译：岩石压缩测试是用于确定岩石弹性模量，峰值强度，泊松比等的通用实验室检测方法数十年来，测试方法的准确性和适用性一直是研究人员的大问题。在这项研究中，进行了脆性页岩的单轴试验。分析了球形/平稳上载压板诱导的倾斜度。扫描电子显微镜（SEM）用于观察由不均匀负载诱导的微裂纹尖端。考虑到装载压板的倾斜，粒子流量2D用于模拟非均匀的装载过程。分析了典型的后峰值故障，允许负载列车僵硬和伺服响应间隔，这在不受控制的故障过程中起作用。结论表明，载荷压板的轻微倾斜会导致高度不均匀的载荷。脆性岩石后峰值故障的应力 - 应变曲线显示负载列车刚度和伺服响应间隔的特点。结论还表明，UCS检测中轴向菌株对分裂的不敏感是轴向应变速率控制模式的主要原因，在脆性岩石UCS测试中不可或缺地控制。这里的研究可以更好地了解岩石压缩测试和相应的机器设计。

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