Owing to the different mechanics conditions of rock mass engineering under loading and unloading, there are essential distinctions between the mechanics properties of rock masses.
岩体工程具有加载和卸荷两类不同性质的力学状态，在此力学状态各异的情况下，节理岩体的力学特性有本质的区别。
Consequently it has very important theoretical significance to research the unloading characteristics of rock mass with damage mechanics theory.
因此运用损伤力学理论研究岩体在卸荷过程中的特性具有重要的理论意义。
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