大部分这些长线行而且很深的裂缝向东北或西北延伸，并形成平行线，而且经常定期地形成一组组间隔。
Most of these long, linear and very deep cracks trend northeast or northwest and form parallel, often regularly spaced sets.
研究结果表明，在很大的轴向水平压力作用下，介质会产生间隔的拉伸裂缝，形成分层断裂现象。
It is shown that the interval tension fracture would occur repeatedly under large axial compression stress, which forms the layered failure.
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