摘要
To study the influence of axial stress on the failure characteristics of deep arched roadway considering structural effect,true triaxial compression tests were conducted on cubic granite specimens with a three-centered arched hole structure.A video monitoring device was utilized to record the failure process of surrounding rocks.The test results show that under 10−60 MPa axial stress,the surrounding rock failure process included the calm stage,particle ejection stage,fragment ejection stage,and rock slice buckling and spalling stage.Under higher axial stresses(70 and 80 MPa),the failure process is characterized by violent fragment spray during the fourth stage.As the axial stress increases,the failure of surrounding rock increases,while the initial vertical failure stress first increases and then decreases.According to the failure characteristics of roadway under different axial stresses,arranging the roadway along the direction of a moderate axial stress level is desired.
为在考虑结构效应的基础上研究轴向应力对深部拱形巷道破坏特性的影响,对含贯穿三心拱型孔洞的立方体花岗岩试样进行真三轴压缩实验。实验过程中采用视频监控装置记录围岩破坏过程。实验结果表明,在10~60 MPa的轴向应力条件下,围岩破坏经历了平静期、颗粒弹射、块片弹射及岩片屈曲和剥落4个阶段。在较高轴向应力(70和80 MPa)条件下,围岩破坏的第4阶段中出现了剧烈块片喷射现象。随着轴向应力的增大,围岩破坏剧烈程度增大,但初始破坏竖向应力先增大后减小。基于不同轴向应力条件下巷道的破坏特征,建议巷道沿着中等水平轴向应力方向布置。
基金
supported by the National Key Research and Development Program of China-2023 Key Special Project(No.2023YFC_(2)907400)
the Hunan Provincial Natural Science Foundation for Distinguished Young Scholars,China(No.2023JJ10072)
the Science and Technology Innovation Program of Hunan Province,China(No.2022RC1173)
the Fundamental Research Funds for the Central Universities of Central South University,China(No.2023ZZTS0499).
