【摘要】 本文讨论了软岩的基本特性。根据软岩的膨胀崩解耐久性、冻融作用、力学性质试验结果、，分析软岩力学特性与赋存环境（含水量、地应力、温度）和时间的关系。总结了软岩的力学性质变化特征。并提出软岩强度取值原则。更多还原

【Abstract】 This paper deals with basic characteristics of incompetent rocks. According to experiment results of the expansibility and slaking durability, frost-thawing action, and mechanical properties of the weak rocks, the effect of time and environment (water content, temperature, stress in the earth’s curst) of the rock occurrence on the mechanical properties of the weak rocks are analysed. The variation regularities of the mechanical properties of different rock elements are summarized. The author propose the principle for determining strength of weak rocks.更多还原