The gravity not only can caused the vertical crustal stress, but also it can caused the horizontal crustal stress.
重力作用既产生竖向地应力，和水平地应力。
It have proved the horizontal crustal stress far strong the vertical crustal stress in underground tunnel by a calculated example (that tallies completely with reality conditions).
通过计算实例证明了地下隧道水平地应力远大于其竖向地应力(这一点与实际情况是完全吻合的)。
It gives the scientific voice way of vertical crustal stress and horizontal crustal stress by gravity.
给出了重力所致竖向地应力与水平地应力的科学表达方式。
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