The pressure was then suddenly released in order to find out the critical condition of failure under the combined effect of confining pressure and pore pressure.
在轴对称的实验装置上，对上下施加侧压的中心开孔的含瓦斯煤饼，将孔内压力突然降至大气压，求得煤样在侧压和瓦斯压力联合作用下的临界破坏条件。
Granule failure of calcareous sand is very special at low stress level. The effect of confining pressure on granule farlure is analyzed and its deformation mechanism discussed.
针对低应力水平下钙质砂的颗粒破碎现象具有特殊性，分析了围压对钙质土颗粒破碎的影响，揭示其变形过程的力学机制；
Results show that rock damaged under cyclical impact will obviously bring confining pressure effect, and the existence of confining pressure also increased the ability of rock against impact damage.
结果表明，岩石循环冲击损伤具有明显的围压效应，围压的存在提高了岩石抗冲击破坏的能力。
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