循环载荷下不同巷道形态砂岩变形破坏特征及声学特性
Deformation damage and acoustic characteristics behind sandstone under different shapes of tunnels by cyclic loading
刘刚 1王盛旋 2王冬伟 2昝永龙 2杨志涛 3刘左成4
作者信息
- 1. 黑龙江科技大学 黑龙江省煤矿深部开采地压控制与瓦斯治理重点实验室,哈尔滨 150022;宝泰隆新材料股份有限公司,黑龙江 七台河 154604
- 2. 黑龙江科技大学 黑龙江省煤矿深部开采地压控制与瓦斯治理重点实验室,哈尔滨 150022
- 3. 宝泰隆新材料股份有限公司,黑龙江 七台河 154604
- 4. 黑龙江龙煤七台河矿业有限公司 建设煤矿,黑龙江 七台河 154604
- 折叠
摘要
为研究含不同巷道形态砂岩在循环加卸载下变形破坏特征和声学特性,利用TAW-2000 型压力机和SH-Ⅱ型声发射系统对砂岩开展单轴循环加卸载实验,并利用静态应变仪采集试样不同区域形态特征.结果表明:不同形态巷道循环加卸载后,其单轴抗压强度明显下降;在载荷-位移曲线上出现滞回环,并与曲线同方向移动,曲线整体凹陷程度与应力的上限呈正相关关系;近场变形量明显大于远场变形量,且轴向应变远大于径向应变,圆形巷道形态孔洞最为稳定,拱形巷道形态最不稳定;加载阶段声发射特征明显,卸载阶段时声发射相对减少,随着循环次数的增加,声发射活跃程度降低,强度也在降低.
Abstract
This paper is an effort to investigate the deformation and damage characteristics and acous-tic properties of the sandstone under different channel morphology by cyclic loading and unloading.The study works by using TAW-2000 press and SH-II acoustic emission system to conduct the uniaxial cyclic loading and unloading experiments on sandstone,and collecting the specimen with different morphological characteristics in different regions by static strain gauge.The results show that after cyclic loading and unloading of different morphology of the roadway,the uniaxial compressive strength decreases obviously.The hysteresis loop appears on the load-displacement curve and moves in the same direction with the curve,and the overall depression degree of the curve shows a positive correlation with the upper limit of the stress.The amount of deformation in the near field is obviously larger than that in the far field,and the axial strain is much larger than that in the radial strain.The holes in the circular channel morphology are most stable,but the holes in the arch-shaped channel are most unstable.The acoustic emission char-acteristics are obvious in the loading stage,and relatively reduced in the unloading stage.
关键词
孔洞砂岩/循环加卸载/声发射/破裂形态Key words
porous sandstone/cyclic loading and unloading/acoustic emission/rupture morphology引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据