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.
测量结果表明，7个测点的最大水平主应力大于垂直主应力；
The measurement results indicate that:(1) there are 7 measurement points with the maximum horizontal principal in-situ stress more than the vertical principal stress;
本文分析、比较了由不同方法测得的华北地区最大水平主应力方向。
The measured maximum horizontal principal stress orientation in North China by different methods were compared in this paper.
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