• 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引(EI)收录期刊
  • Scopus数据库收录期刊
彭瑞, 欧阳振华, 孟祥瑞, 赵光明, 赵启峰, 石建军, 冯吉成. 逆断层附近非均匀应力场声发射测试与巷道稳定性数值分析[J]. 岩土工程学报, 2019, 41(3): 509-518. DOI: 10.11779/CJGE201903013
引用本文: 彭瑞, 欧阳振华, 孟祥瑞, 赵光明, 赵启峰, 石建军, 冯吉成. 逆断层附近非均匀应力场声发射测试与巷道稳定性数值分析[J]. 岩土工程学报, 2019, 41(3): 509-518. DOI: 10.11779/CJGE201903013
PENG Rui, OUYANG Zhen-hua, MENG Xiang-rui, ZHAO Guang-ming, ZHAO Qi-feng, SHI Jian-jun, FENG Ji-cheng. Acoustic emission testing of nonuniform stress in strata near reverse faults and numerical analysis of stability of roadways[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(3): 509-518. DOI: 10.11779/CJGE201903013
Citation: PENG Rui, OUYANG Zhen-hua, MENG Xiang-rui, ZHAO Guang-ming, ZHAO Qi-feng, SHI Jian-jun, FENG Ji-cheng. Acoustic emission testing of nonuniform stress in strata near reverse faults and numerical analysis of stability of roadways[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(3): 509-518. DOI: 10.11779/CJGE201903013

逆断层附近非均匀应力场声发射测试与巷道稳定性数值分析

Acoustic emission testing of nonuniform stress in strata near reverse faults and numerical analysis of stability of roadways

  • 摘要: 由于断层带附近应力集中和围岩破碎严重给巷道断面布设和维护带来巨大安全隐患,需及时掌握断层附近地应力分布和围岩破裂形式及其对周边巷道稳定性影响。选取淮南某矿逆断层上、下盘进行试验,利用MTS试验系统配合声发射测试初始地应力场和岩石破裂方式,经ANSYS对比分析不同应力条件下逆断层附近巷道稳定性。经岩石力学试验发现,砂岩破坏后尺度较小、AE事件数较多,泥岩破坏后尺度较大、AE事件数较少。由地应力实测可知,逆断层附近以构造应力为主,上盘岩层挤压使得下盘总体受力偏大。开挖后巷道周边次生应力在一定范围内出现了应力跌落区,跌落区范围和围岩裂隙发育范围接近。同时,伴随着应力跌落的范围扩大、初始应力减小,岩层开始移动剧烈和围岩破裂范围扩大。由围岩塑性分布和岩层移动可知,调整后主应力有助于提高巷道稳定性。以上研究结果,以期为复杂埋藏环境下矿山巷道的布设和支护问题,提供一定的施工技术依据。

     

    Abstract: The concentrated stress and fractured rock around the fault zone, have great potential safety hazards for the section layout of a roadway and its maintenance, so the distribution of in-situ stress and the failure mode of the surrounding rock near the fault and their influences on the roadway stability should be necessarily grasped. The upper and lower plates of the reverse fault in Huainan Coal Mine are chosen for tests. The in-situ stress fields and rock failure modes are tested by the MTS experimental system and acoustic emission. The stability of roadway near the fault under different in-situ stresses is analyzed by ANSYS. After rock mechanics experiment, it is found that the scale of fractured sandstone is smaller and its AE events number is more, while the size of fractured mudstone is larger and its AE events number is less. According to the measured results of ground stress, it is found that the in-situ stress near the fault is dominated by the tectonic stress. The overall force of the lower plate is large due to the upper plate extrusion. After roadway excavation, the stress drop zone of the secondary stress appears in a certain range around the roadway, and the scope of drop zone is close to the range of fractured surrounding rock. At the same time, with the expanding range of stress drop zone and decrease of the initial stress, the moving of rock strata and expanding of fracture range of the surrounding rock are violent. According to the plastic distribution of the surrounding rock and the movement of rock strata, the adjusted principal stress can improve the stability of roadway. The above research results may provide technical basis for the layout and support of mine roadways in the same complicated burial environment.

     

/

返回文章
返回