初裂缝是沿着最大水平主应力方向的垂直缝。
The beginning of crack is vertical along the orientation of maximum horizontal principal stress.
八十年代初，北京建井研究所在实验室进行了缝管锚杆探索实验取得了良好效果。
The early eighties, the Beijing Research Institute to build wells conducted in the laboratory experiments to explore seam pipe bolt achieved good results.
八十年代初，北京建井钻研所在实验室进行了缝管锚杆探索实验取得了良好效果。
The early eighties the Beijing Research Institute to build Wells conducted in the laboratory experiments to explore seam pipe bolt achieved good results.
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