摘要
在岩石试件卸荷试验的基础上,结合大型开挖工程,研究了岩体在卸荷状态下的变形破裂特征。研究表明,岩石在卸荷状态下的变形表现为沿卸荷方向的强烈扩容,其破裂以张性破裂为特征,并存有张剪性和剪性破裂;卸荷岩体除具有上述变形破裂特征外,其变形破裂程度及方式受岩体结构的控制,比岩石更易发生变形与破坏,特别是其破裂体系,很大程度上受岩体结构的控制。
On the basis of unloading tests of rock sample, the deformation and fracture features of unloaded rock mass are studied in conjunction with fracture systems of some large excavation project. Research shows that the deformation of unloaded rock is of intense dilatancy in unloading direction, the fracture is characterized by tensile one and there are tensile-shear fractures and shear fractures. The deformation and fracture feature of unloaded rock mass is dominated by the rock mass structure, and deformation and failure in unloaded rock is prone to take place compared with those in rock. Especially, the fracture system is controlled by the rock mass structure.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2003年第12期2028-2031,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学青年基金项目(49602040)
国家电力公司九五攻关项目(SPKJ006-02-04)资助。
关键词
岩石力学
卸荷岩体
卸荷试验
变形破裂
Deformation
Excavation
Load testing
Rock mechanics
Rocks
