摘要
依据锚护及锚网支护花岗岩的全应力应变过程，探讨了喷锚支护花岗岩的峰值后特性。依据花岗岩达到峰值强度前的渐进破坏阶段，提出特征应力的概念和相应的判别式，发现各特征应力和工程岩爆级别有良好相关性。结合陈、康扩容本构关系进行了数值分析。计算结果能够揭示脆性岩石地下洞室的变形特性，初步体现喷锚支护对花岗岩渐进破坏的防护作用。
According to complete stress-strain curves of shotcrete-bolt supported granite,the mechanism of shotcrete and bolt protection against brittle rock failure and behaviour after rock peak strength are researched. Having studied the granite deformation characteristics,this paper presents a theory of characteristic stresses for the granite approaching failure and its fracture process. On the basis of this theory,the behaviour after peak strength and Tan-Kong’s dilatancy constitutive equations,this paper has carried out a numerical simu-lation.The calculated results indicates that the numerical slniulation can reveal the granite deformation character and the fracture mechanism of chamber periphery in brittle rock,predict fracture level and its range, express the protection effect of bolt and shotcrete.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
1994年第4期327-337,共11页
Chinese Journal of Rock Mechanics and Engineering
关键词
喷锚支护
花岗岩
地下洞室
变形
防护
shotcrete-bolt support, granite,characteristic stresses
