摘要
为了研究盐岩在裂隙和孔洞等缺陷下的损伤闭合行为,对盐岩试样进行室内单轴压缩试验,建立含孔洞-裂隙组合下的数值模型。结果表明:当岩盐试样保持完整(没有缺陷)时,其峰值强度随着加载速率的增大而增大,符合幂指数函数关系,其弹性模量也随之增大,符合线性函数关系;缺陷的存在降低了盐岩的峰值强度,在加载的过程中裂隙会出现闭合,在闭合后的裂隙附近萌生微裂纹,逐渐扩展、贯通形成主裂纹,造成试样的破坏;在轴向力的作用下,不同倾角裂隙闭合程度有所差异,90°倾角下的裂隙基本不会出现闭合行为;圆孔孔洞的存在直接影响裂纹萌生的位置,且围绕在圆孔周围的不同倾角裂隙对圆孔的闭合不产生显著影响。
In order to study the damage closure behaviour of salt rock under cracks and holes,indoor uniaxial compression tests were carried out on salt rock samples and the numerical model with holes and cracks was established.The results show that when the salt rock sample remains intact(without defects),its peak strength increases with the increase of loading rate,which conforms to the power exponential function relationship;its elastic modulus also increases,which conforms to the linear function relationship.The defects reduce the peak strength of salt rock.During the loading process,the cracks will close,and microcracks will sprout near the closed cracks,and gradually expand and connect to form the main cracks,which will cause the destruction of the samples.Under the axial force,the closure degree of fractures with different dip angles is different,and the fracture with 90°inclination angle will not close basically.The existence of the hole directly affects the location of the crack initiation,and the cracks with different dip angles around the hole have no significant effect on the closure of the hole.
作者
邵元元
SHAO Yuanyuan(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《洛阳理工学院学报（自然科学版）》
2022年第2期41-45,共5页
Journal of Luoyang Institute of Science and Technology：Natural Science Edition
关键词
盐岩
抗压强度
裂纹扩展
离散元
破坏形态
salt rock
compressive strength
crack propagation
discrete element
failure pattern
