• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
神东矿区不同赋存深度沉积岩抗拉强度与断裂韧度研究
  • Title

    Tensile strength and fracture toughness of sedimentary rocks at different buried depths in Shendong coal field

  • 作者

    赵毅鑫刘斌杨志良宋桂军杨东辉

  • Author

    ZHAO Yixin1,2,3 ,LIU Bin1,3 ,YANG Zhiliang1,3 ,SONG Guijun2,4 ,YANG Donghui1,3

  • 单位

    中国矿业大学(北京) 能源与矿业学院煤炭开采水资源保护与利用国家重点实验室中国矿业大学(北京) 共伴生能源精准开采北京市重点实验室神东煤炭集团有限责任公司 神东煤炭技术研究院

  • Organization
    1. School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing  100083,China; 2. State Key Laboratory of Wa- ter Resource Protection and Utilization in Coal Mining,Beijing  100011,China; 3. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Re- sources,China University of Mining and Technology(Beijing),Beijing  100083,China; 4. Shendong Coal Technology Research Institute,Shendong Coal Group Corporation Limited,Shenmu  719315,China
  • 摘要

    为研究神东矿区不同赋存深度沉积岩抗拉及断裂性能,利用声发射监测系统对神东矿区不同赋存深度沉积岩样品巴西劈裂加载过程中的声发射参数进行监测,探讨了岩样抗拉强度、I型断裂韧度及两者比值k随赋存深度的变化规律;分析了劈裂破坏过程中损伤演化、破坏特征及前兆信息。结果表明:抗拉强度和断裂韧度随赋存深度增加而增大,且二者均与赋存深度呈幂函数关系,埋深-300 m以浅岩样的抗拉强度和断裂韧度分别在0.5 MPa和0.15 MPa·m1/2以下,而-300 m以深岩样则分别在1.0 MPa和0.15 MPa·m1/2以上;岩样抗拉强度与断裂韧度的比值k也随赋存深度的增加而增大,且与赋存深度呈对数函数关系,即埋深-300 m以浅岩样k值为2~3,-400 m左右k值为3~6,-500 m以下k值相对离散。同时,神东矿区不同赋存深度岩样破坏为张-剪混合型,张拉破坏贯穿整个破坏过程,但剪切破坏发生时间不同,即-300 m以浅岩样剪切破坏发生在峰后阶段,而-300 m以深岩样剪切破坏发生在峰前阶段;不同赋存深度岩样在峰值强度前均会出现破坏前兆点,-300 m以浅岩样(除中粗砂岩外)基本在应力峰值的70%~90%,而-300 m以深多在应力峰值的92%以上;可以看出沉积岩失稳预警时间随赋存深度增加而减少,且随深度增加其失稳破坏更加迅速且剧烈。

  • Abstract
    To investigate the tensile strength and fracture properties of sedimentary rock buried at different depths in Shendong coal field,the acoustic emission ( AE) parameters of sedimentary rock specimens at dif-ferent depths in Shendong coal field were monitored by AE monitoring system during the Brazilian splitting experiment. The variation of tensile strength,model I fracture toughness and the ratio k(tensile strength with respect to fracture toughness) of rock specimens with respect to the buried depth was discussed. The damage evolution,failure features and precursory fea- tures of specimens were also analyzed. The results indicate that the tensile strength and the fracture toughness increase with the increase of the buried depth and have power function relationship to the buried depth. In general,the tensile strength and the fracture toughness of rocks buried depth above -300 m are lower than 0. 5 MPa and 0. 15 MPa· m1 / 2 ,while those buried depth deeper than -300 m are higher than 1. 0 MPa and 0. 15 MPa·m1 / 2 ,respectively. The ratio k also increases with the rise of the buried depth,and has a logarithmic function relationship with the depth. The k values of rocks with the buried depth over -300 m are 2-3. The k values are 3-6 for the rocks with the buried depth close to -400 m,while the k values are relatively discrete for the rocks with the buried depth deeper than -500 m. In addition,the failure modes were observed similarly existing in the tested specimens,tension-shear mixed failure is the dominant pattern. However,the shear failure occurs at different time for the specimens with the various buried depths. For example,the shear failure begins to appear in the post-peak stage for the rocks with the buried depth less than -300 m,while the shear failure appears in the pre-peak stage for the rocks with the buried depth larger than -300 m. The failure precursors of the tested rocks appear normally before the peak strength,except the difference of the trig- gered stress. The precursors of the specimens (except medium-coarse sandstone) with the depth less than -300 m ap- pear at the stress reaching 70% -90% peak stress. For the specimens with the buried depth larger than -300 m,the precursors appear at the stress larger than 92% of the peak stress. This indicates that the warning time of the specimen failure decreases with the increase of the buried depths.
  • 关键词

    沉积岩赋存深度抗拉强度声发射断裂韧度深部开采

  • KeyWords

    sedimentary rock;buried depth;tensile strength;acoustic emission;fracture toughness;deep mining

  • 基金项目(Foundation)
    国家重点研发计划资助项目(2016YFC0600708);国家自然科学基金资助项目(51874312); “煤炭开采水资源保护与利用”国家重点实验室基金资助项目(SHJT-16-30 17)
  • DOI
  • Citation
    ZHAO Yixin,LIU Bin,YANG Zhiliang,et al. Tensile strength and fracture toughness of sedimentary rocks at different buried depths in Shendong coal field[J]. Journal of China Coal Society,2019,44(6):1732-1741.
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