单轴压缩荷载下“十字形”交叉裂隙类岩石试件的破坏模式与力学特性试验研究  

Experimental study on failure modes and mechanical properties of crisscross fractured rock samples under uniaxial compression conditions

作　　者：陈蕴生[1] 李光明 韩铁林[1,3] 李智慧 余朝 周冲[1] CHEN Yun-sheng;LI Guang-ming;HAN Tie-lin;LI Zhi-hui;YU Zhao;ZHOU Chong(Institute of Geotechnical Engineering,Xi’an University of Technology,Xi’an 710048,Shaanxi,China;Tongyuan Design Group Co.,Ltd.,Jinan 250101,Shandong,China;Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China)

机构地区：[1]西安理工大学土木建筑工程学院岩土工程研究所,陕西西安710048 [2]同圆设计集团有限公司,山东济南250101 [3]深圳大学广东省滨海耐久性重点实验室,广东深圳518060

出　　处：《实验力学》2020年第3期511-520,共10页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目(51269024,11302167);陕西省教育厅重点实验室科研计划项目(16JS074)。

摘　　要：通过在类岩石材料中预制特定裂隙的方法,来模拟含“十字形”交叉裂隙的岩体,并对其在单轴压缩情况下的力学特性与破坏模式进行了试验研究。研究表明:(1)交叉裂隙试件中,次裂隙倾角对主裂隙倾角为45°时试件的抗压强度与起裂应力的影响最大,而对主裂隙倾角为90°时的影响最小。(2)单裂隙试件的抗压强度与起裂应力小于完整试件。交叉裂隙试件相对于单裂隙试件而言,当主裂隙倾角为0°和45°时,其抗压强度与起裂应力减小;当主裂隙倾角为90°时,其抗压强度与起裂应力增大。(3)在单裂隙试件中,当裂隙倾角为0°、45°和90°时,试件分别发生拉剪复合型破坏、剪切破坏和张拉破坏;相对于单裂隙试件而言,交叉裂隙试件破坏时产生的裂纹相对较多,破坏模式大多为拉剪复合型破坏,同时,在破坏过程中交叉裂隙试件发生复合其他破坏模式或直接导致试件破坏的滑移。上述结果对岩体工程的开挖和建设具有一定的参考价值。The crisscross fractured rocks are simulated by means of prefabricating specific fractures in rock-like materials.The mechanical properties and failure modes are studied experimentally under uniaxial compression conditions.The results show that:(1)Among the cross fractured rocks,the secondary crack dip angle has the greatest influence on the compressive strength and crack initiation stress when the main fractured inclination angle is 45°,while the secondary crack dip angle has the least influence on the compressive strength and crack initiation stress when it is 90°.(2)The compressive strength and the crack initiation stress of single fractured rocks are smaller than those of complete rocks.Compared with the single fractured rock,the compressive strength and the crack initiation stress decrease when the inclination angle of the main fractured inclination angle is 0°and 45°,while the compressive strength and the initiation stress increase when it is 90°.(3)In the single fractured rocks,when the main fractured inclination angle is 0°,45°and 90°,the tensile shear failure,shear failure and tensile failure occur,respectively.Compared with the single fractured rocks,the cross fractured rocks produce much more cracks when they are destroyed,and the failure mode is mostly tensile and shear composite failure.At the same time,in the process of failure,the slip of composite other failure modes or the slip of the rock directly leading to the failure of the cross fissure rock will occur.The work would provide valuable guidance for excavation and construction of rock mass engineering.

关 键 词：单轴压缩 裂隙试件 交叉裂隙 破坏模式 力学特性 

分 类 号：TU45[建筑科学—岩土工程]