隧道按埋深分类应考虑的主要因素之一是围岩的变形破坏方式，而后者与围岩的初始应力状态密切相关。
One of the important factors taken into account in the tunnel classification is the style of deformation and failure, which is related to initial stress state in wall rock.
基于湿吸力概念，分析并给出了有效应力公式，建议了非饱和土的状态分类及有效应力原理。
Based on this absorbed suction concept, the classification of saturation in soil and a principle of effective stress are proposed for unsaturated soils.
基于湿吸力概念，分析并给出了有效应力公式，建议了非饱和土的状态分类及有效应力原理。
Based on this absorbed suction concept, the classification of saturation in soil and a principle of effective stress are proposed for unsaturated soils.
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