摘要
岩石损伤破坏研究是近年来岩石力学领域中的热点研究内容之一。数字图像相关(digital image correlation,DIC)技术因具有全场非接触、适应性好、精度高等优点被广泛应用于岩石破坏试验研究中。为了研究岩石损伤程度及演化过程,基于室内单轴压缩试验和DIC技术,建立了多层砂岩在垂直匀速加载作用下的物理模型,分析了在垂直匀速加载作用下多层砂岩裂缝产生-扩展-贯通全过程、砂岩破断面特征以及位移演化规律。结果表明:①多层砂岩在垂直匀速加载作用下,最底层砂岩中部首先发生拉伸破坏,然后砂岩两侧发生剪切破坏。②砂岩的破断面具有明显特征,即砂岩左侧和右侧破断面均有明显的擦痕,为剪切破坏;砂岩中部破断面无任何摩擦痕迹,为拉伸破坏。③砂岩的水平和垂直位移时间变化过程主要分为3个阶段,首先水平位移变化较大,砂岩处于拉伸破坏过程中,随后测点间水平位移变化很小,砂岩发生拉伸破坏;接着测点垂直位移缓慢增长,与拉伸破坏阶段的规律基本一致,砂岩处于剪切裂缝发育阶段;最后剪切裂缝贯通,裂缝两侧岩块发生剪切错动,测点垂直位移迅速增加。该研究结果有助于从全新的角度理解多层砂岩的破坏机制。
The study of rock damage research has been one of the hot topics in the field of rock mechanics in recent years.Digital image correlation(DIC)technology has the advantages of non-contact,good adaptability,high accuracy,etc.It is widely used in rock damage test research.To study the degree of rock damage and the evolution process,based on indoor uniaxial compression test and DIC technology,a physical model for multilayer sandstone under vertical uniform loading was established.The whole process of crack generationexpansion-penetration,the characteristics of sandstone fracture section,and the displacement evolution law of multi-layer sandstone under vertical uniform loading were analyzed.Results show that:①The multi-layer sandstone under vertical uniform loading,tensile failure occurs first in the middle of the bottom sandstone,and then shear failure occurs on both sides of the sandstone.②The fracture surface of the sandstone has obvious characteristics,i.e.,the left and right fracture surfaces of the sandstone have obvious friction marks,which is shear damage;the middle fracture surface of the sandstone does not have any friction marks,which is tensile damage.③Vertical uniform loading of sandstone,sandstone horizontal and vertical displacement time change process is mainly divided into three stages:first,horizontal displacement change is large,the sandstone is in the process of tensile damage,and then the change of horizontal displacement between the measurement points is very small,the sandstone tensile damage;then,vertical displacement of the measurement points grows slowly,and the tensile damage stage of the analysis of the law is basically the same,the sandstone is in the stage of development of the shear crack;finally,the shear crack passes through,and the rock mass on both sides of the crack undergoes shear misalignment,and the vertical displacement of the measurement point increases rapidly.The research results help to understand the damage mechanism of multilayer sandstone from a new perspective.
作者
闫宪洋
张全
王超
高伟明
张泉
邹俊鹏
汪漫
田伟杰
YAN Xianyang;ZHANG Quan;WANG Chao;GAO Weiming;ZHANG Quan;ZOU Junpeng;WANG Man;TIAN Weijie(Yanzhou Coal Industry Company Limited,Jining 273500,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;College of Information Engineering,Wuhan Business University,Wuhan 430113,China)
出处
《安全与环境工程》
北大核心
2025年第4期105-112,共8页
Safety and Environmental Engineering
基金
山东能源集团2022年揭榜挂帅项目(SNKJ2022A01-R26)
国家自然科学基金青年科学基金项目(42307191)
国家自然科学基金面上项目(42177152)
湖北自然科学基金面上项目(2025AFB485)。
