考虑翼裂纹扩展的非贯通节理岩体损伤模型  

A Damage Model of Nnon-penetrating Jointed Rock Mass Considering Wing Cracks Propagation

作　　者：李凯 卢宝华 Li Kai;Lu Baohua(AVIC Institute of Geotechnical Engineering Co.,Ltd.,Beijing,China)

机构地区：[1]中航勘察设计研究院有限公司,北京

出　　处：《科学技术创新》2025年第10期31-34,共4页Scientific and Technological Innovation

摘　　要：现有的非贯通节理损伤模型仅考虑了初始非贯通节理对岩体力学性质的影响,而忽略了压缩载荷作用下非贯通节理尖端翼裂纹扩展对岩体力学性质的影响。为此,首先推导了翼裂纹应力强度因子计算方法。当翼裂纹应力强度因子KI(l)>KIC时,翼裂纹发生扩展,当翼裂纹应力强度因子KI(l)>KIC时,翼裂纹停止扩展。进而结合损伤断裂力学理论,建立了考虑节理尖端翼裂纹扩展长度的非贯通节理岩体损伤模型。最后通过算例对该计算模型进行验证。The existing damage models of non-through joint only consider the effect of initial joint on the mechanical properties of rock mass,but ignore the effect of wing cracks propagation at the tip of non-through joint on the mechanical properties of rock mass.Fristly,the calculation method of stress intensity factor of wing crack is derived.When the wing crack stress intensity factor,the wing crack propagation occurs.When the wing crack stress intensity factor,the wing crack propagation stops.Combined with the theory of damage fracture mechanics,the damage model of rock mass with non-through joint is established considering the wing crack propagation length of joint tip.Finally,the calculated model is verified by an example.

关 键 词：翼裂纹扩展 应力强度因子 损伤变量 

分 类 号：TU45[建筑科学—岩土工程]