洞室地应力以构造应力为主，其最大主应力方向与厂房轴线方向近垂直。

The cave's initial principal stress is tectonic stress, and the Max main stress's direction is perpendicular to the power house's stalk line.

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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；

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.

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