out internal friction
外内摩擦
以上为机器翻译结果，长、整句建议使用 人工翻译 。
By considering the variations of the cohesion and the Angle of internal friction for rock, the parameter studies on the stress distribution around one and two tunnels were carried out.
考虑岩石粘聚力和内摩擦角的变化，进行了一个和二个隧道周围的应力分布的参数研究，内摩擦角？
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