卸围压速度越大，煤岩的渗透率增大的越快。
The permeability of coal increased at a faster rate when the unloading speed was larger.
研究结果表明：卸围压对岩石的强度影响很大。
The experimental results indicate that unloading confining pressure has important effect on the intensity of rock.
随初始围压的增大，屈服阶段卸围压时试件加速破坏的趋势更加明显；
The increasing failure is more and more obvious in yield phase with the increase in initial confining pressure;
卸围压开始后煤岩在应力平台阶段的渗透率与卸围压时间呈指数函数关系。
During the unloading process of confining pressures, the permeability of coal being in the stage of stress flat roof showed an exponential function with the corresponding time.
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。
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。
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.
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