摘要
针对板裂和似板裂介质结构围岩体的流变特性,建立了粘弹性围岩岩层的屈曲模型,给出了可描述巷道围岩蠕变特征的岩板松弛模数,及在一定载荷作用下粘弹性岩板的屈曲和后屈曲临界载荷特性曲线。分析计算表明,当岩板的压应力水平增大到亚临界屈曲状态时,由于材料的非稳定蠕变特征将引起岩层的分岔失稳,围岩发生后屈曲破坏。后屈曲模态幅值可作为岩层破坏的位移判据及时间判据。
According to rheological behavior for surrounding rock with slab-rent and quasi-slab-rent structure, the buckling model of visco-elasticity rock strata is built. The relaxation module of rock plate described creep behavior of surrounding rock is derived. And the critical load curves for buckling and post-buckling behavior of visco-elasticity rock plate are given in the load. Some researches and calculations show that upon condition that compression stress is added up to subcritical buckling, the bifurcation buckling of rock strata will be caused owing to creep behavior of rock mass, the post-buckling failure of surrounding rock will be occurred, that post-buckling mode amplitude can work as displacement and time criteria of a fracturing rock stratum.
出处
《西安科技大学学报》
CAS
北大核心
2004年第3期342-345,385,共5页
Journal of Xi’an University of Science and Technology
关键词
板裂介质
围岩
屈曲
后屈曲
流变特性
slab-rent structure
surrounding rocks
rheological behavior
buckling
post-buckling
