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Imperfect loading in rock compression tests

机译：岩石压缩测试中的不完全载荷

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Stress-strain curve of brittle rock has been well studied in the past fifty years.Researches have been focused on the imperfect loading induced by loading machine and the imperfectly machined rock specimen.In this study,uniaxial tests of brittle shale from Longmaxi Formation were conducted.Non-uniform loading induced by flatly seated upper loading platen was analyzed by comparing the data from two linear variable differential transformers.Particle flow code 2D was used to simulate the bedding down region of stress-strain curve and the distortion of loading platen.A new explanation about bedding down region of stress-strain curve was proposed.Conclusion shows that:(1)The simulation results indicated that the distortion of load train leaded to a non-uniform loading that was not ignorable.(2)Both experiments and simulation results showed that besides the compression of the pores inside the rock,the'bedding down'region in stress-strain curve could also be induced by the contacting process between the upper loading platen and the imperfectly machined rock specimen.The study provides a better understanding on the uniaxial/tri-axial tests of brittle geo-materials.
机译：脆性岩石应力 - 应变曲线，在过去的五个years.Researches一直专注于通过加载机和不完善加工岩石specimen.In这项研究引起了不完美的负载得到很好的研究，从龙马溪组页岩脆性单轴测试进行通过平坦地安置上装载压板诱导。非均匀加载通过比较来自两个线性可变差动transformers.Particle流代码2D数据分析被用来模拟被褥下应力 - 应变曲线的区域和装载platen.A的失真约寝具下应力 - 应变曲线的区域的新的解释是proposed.Conclusion表明：（1）模拟结果表明，负载列车的失真含铅到非均匀加载，这是不可忽略（2）两个实验和仿真。结果表明，除的压缩岩石内的孔，在应力 - 应变曲线the'bedding down'region也可以通过所述接触过程中引起上部装压板和不完全加工的岩石specimen.The研究之间提供了更好的脆性岩土材料的单轴/三轴测试的理解。

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