大埋深隧道
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When the direction of tunnel axis is vertical to the maximum principal stress, the depth of BEDZ is larger than that of which the direction of tunnel axis is parallel to the maximum principal stress.
隧洞轴线垂直于最大主应力时的钻爆开挖损伤明显要大于轴线平行于最大主应力时的情况；
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