| 含裂隙岩石裂纹扩展与剪切特性的数值研究* |
| |
| 引用本文： | 冯豪天,陈俊智,任春芳.含裂隙岩石裂纹扩展与剪切特性的数值研究*[J].中国安全生产科学技术,2022,18(6):134-140. |
| |
| 作者姓名： | 冯豪天 陈俊智 任春芳 |
| |
| 作者单位： | (昆明理工大学 国土资源工程学院，云南 昆明 650093) |
| |
| 基金项目： | * 基金项目: 国家自然科学基金项目(U1602232) |
| |
| 摘 要： | 为研究直剪条件下含交叉裂隙岩石的裂纹扩展模式和剪切特性，基于PFC2D研究直剪条件下含裂隙岩石的裂纹扩展模式和剪切特性。研究结果表明:直剪过程可分4个阶段:Ⅰ初始平静阶段、Ⅱ裂纹单一扩展阶段、Ⅲ裂纹复杂扩展阶段、Ⅳ破坏阶段；法向应力越大，Ⅱ，Ⅲ阶段的裂纹扩展程度受到抑制；岩石中含单裂隙时，随裂隙角度α的增加，抗剪强度的变化趋势基本一致，遵循先降后增的规律；含交叉裂隙时，当主裂隙角度α=120°，150°时，抗剪强度随次裂隙角度β的增加呈先减小后增大的趋势，抗剪强度最小值均出现在β=30°；加固含裂隙岩体时，预防裂隙或者潜在破坏面两侧的岩体产生位移差，使其加固后成为1个稳固整体，是避免岩体产生裂纹导致破坏的重要手段。
|
| 关 键 词： | 裂纹扩展 剪切特性 岩体加固 PFC2D 交叉裂隙 直剪试验 |
Numerical study on crack propagation and shear properties of rock with flaws |
| |
| FENG Haotian,CHEN Junzhi,REN Chunfang.Numerical study on crack propagation and shear properties of rock with flaws[J].Journal of Safety Science and Technology,2022,18(6):134-140. |
| |
| Authors: | FENG Haotian CHEN Junzhi REN Chunfang |
| |
| Affiliation: | (Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China) |
| |
| Abstract: | In order to study the crack propagation mode and shear characteristics of rock with cross flaws under direct shear，the crack propagation patterns and shear properties of rock with flaws under the direct shear condition were studied based on PFC2D.The results showed that the direct shear process could be divided into four stages:Ⅰ initial quiet stage,Ⅱ simple crack propagation stage,Ⅲ complex crack propagation stage and Ⅳ failure stage.The larger the normal stress was,the crack propagation degree in stage Ⅱ and Ⅲ was inhibited.When the rock contained single flaw,with the increase of flaw angle α,the shear strength changed in a basically consistent trend,following the law of decreasing first and then increasing.When the rock contained cross-flaws and the main flaw angle α was 120° or 150°,the shear strength decreased first and then increased with the increase of the secondary flaw angle β,and the minimum shear strength occurred when β=30°.During the reinforcement of rock with flaws,preventing the rock mass on both sides of the flaw or potential failure surface from producing displacement difference and making it become a whole after reinforcement is an important means to avoid the failure caused by cracks in rock mass. |
| |
| Keywords: | crack propagation shear property rock mass reinforcement PFC2D cross-flaws direct shear test |
|
| 点击此处可从《中国安全生产科学技术》浏览原始摘要信息 |
|
点击此处可从《中国安全生产科学技术》下载全文 |
