The pseudo-triaxial compression tests and confining pressure reduction tests were carried out for coal specimen strengths in different stress on servo-controlled testing machine.

基于在伺服试验机对煤样的常规三轴压缩和三轴卸围压试验，分析了煤样在不同应力条件下的强度和变形特征。

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Various loading and unloading paths are carried in servo-controlled testing machine to study the relationships among axial stress, strain, confining pressure and circumference deformation.

在伺服试验机上对岩样进行了多种路径的加载、卸载试验，分析岩样轴向应变、环向变形与轴向应力、围压之间的关系。

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Material testing machine, controlled by microcomputer, is a research and development hotspot of both domestics and overseas at present.

全自动微机控制的材料试验机，是目前国内外材料试验机行业开发研究的热点。

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