摘要
初始裂隙倾角是影响裂隙岩体再生裂隙扩展方向和损伤断裂模式的重要因素之一,采用岩石破裂过程RFPA数值分析系统对不同倾角的单裂隙岩石在单轴压缩条件下破坏过程进行数值模拟。结果表明:当裂隙倾角不大于45°时,试件呈现出拉伸和剪切的混合破坏;裂隙倾角为60°时试件以拉伸破坏为主;裂隙倾角为75°时试件以剪切破坏为主。受岩石强度、内摩擦角和压拉比的影响,初始裂隙倾角对单裂隙岩石峰值强度的影响趋势具有多变性,其影响趋势可分为三类,一是随着裂隙倾角的增加岩石峰值强度增加;二是随着裂隙倾角的增加岩石峰值强度先降低再增加;三是随着裂隙倾角的增加岩石峰值强度先增加后降低再增加。
The initial crack dip angle is one of important factors affecting crack propagation process and damage-fractured mode of rock.Failure process of single fractured rock under uniaxial compression was simulated using numerical test of rock failure RFPA.The results show that there are three failure forms such as tension-shear combined fracture,tension fracture and shear fracture in the specimens with different initial crack dip angles.The influence of initial crack dip angle on peak strength of rock mass can be divided into three classes.The peak strength of cracked samples tends to increase with the increase of the initial crack dip angle in the first class.In the second class,the peak strength of cracked samples tends to decrease first and then increase with the increase of the initial crack dip angle.The peak strength of cracked samples tends to increase first and then decrease and then increase with the increase of the initial crack dip angle.
出处
《中国矿业》
北大核心
2017年第10期173-176,共4页
China Mining Magazine
基金
国家自然科学基金面上项目资助(编号:51374135)
关键词
单轴压缩
峰值强度
裂隙倾角
破坏模式
uniaxial compression
peak strength
crack dip angle
failure form
