裂隙岩体的损伤断裂理论与应用

本文将损伤力学和断裂力学结合起来，分析岩体中裂隙系统的损伤和断裂特性。定义了岩体宏观损伤张量和岩体损伤应变。建立了岩体的等效连续损伤断裂本构模型。讨论了在压应力作用下的裂隙闭合效应。提出了裂隙岩体损伤断裂复合强度理论。利用损伤断裂模型对一地下洞室的分步开挖进行了数值模拟分析，获得了与现场实测数据比较吻合的结果。

THE DAMAGE FRACTURE THEORY AND ITS APPLICATION IN JOINTED ROCK MASS

In this paper,the damage and fracture behaviour of joint system in rock mass isstudied and analysed by adopting a combination concept with damage mechanics and fracture mechanics.The macrodamage tensor and damage strain are defined.An equivalentcontinuum damage fracture model is proposed.Under a compressive stress state,the closure effect of joints is considered.Tlie composite damage fracture strength theory for rockmass is established.Thereafter.the mutistage excavation procedure of an underground issimulated numerically by using above damage fracture model and the satisfactory resultsare obtained compared with in situ measured data.