Showing 841 - 860 results of 2,575 for search '"Rock ', query time: 0.09s Refine Results
  1. 841
  2. 842
  3. 843
  4. 844
  5. 845
  6. 846
  7. 847
  8. 848
  9. 849

    Freezing Method for Rock Cross-Cut Coal Uncovering: Aging Characteristic of Effective Freezing Distance on Injecting Liquid Nitrogen into Coal Seam by Heyi Ma, Chuanqu Zhu, Pengtao Zhao, Binbin Wang

    Published 2021-01-01
    “…This result will provide a theoretical basis for layout optimization of injection holes in rock cross-cut coal uncovering.…”
    Get full text
    Article
  10. 850
  11. 851
  12. 852

    Failure Mechanism Analysis and Support Design for Deep Composite Soft Rock Roadway: A Case Study of the Yangcheng Coal Mine in China by Bangyou Jiang, Lianguo Wang, Yinlong Lu, Shitan Gu, Xiaokang Sun

    Published 2015-01-01
    “…It was found that the surrounding rock of the roadway was HJS complex soft rock that was characterized by poor rock quality, widespread development of joint fissures, and an unstable creep property. …”
    Get full text
    Article
  13. 853

    Research on Pressure Relief Method of Close Floor Roadway in Coal Seam Based on Deformation and Failure Characteristics of Surrounding Rock in Deep Roadway by Jianjun Cao, Benqing Yuan, Siqian Li, Zunyu Xu, Qihan Ren, Zhonghua Wang

    Published 2022-01-01
    “…In addition, the deformation and failure degree of the surrounding rock was higher due to the disturbance from the deep high-stress roadway. …”
    Get full text
    Article
  14. 854

    Space-Time Evolution Laws of Zonal Disintegration in Deep Underground Caves Based on Coordination Deformation between the Bolt Body and Surrounding Rock by Yuan-xiang Yu, Zhi-xun Xie, Bao-ping Chen

    Published 2021-01-01
    “…Zonal disintegration refers to the special phenomenon whereby fractured zones and intact zones appear alternately in deep-buried surrounding rocks under high stress conditions, which are different from that of the shallow rock mass. …”
    Get full text
    Article
  15. 855

    Analysis of the Influence of Upper Protective Layer Mining on the Effect of Pressure Relief and Protection of Coal and Rock Masses between the Lower Overburden Layers by Jiaxin Dang, Min Tu, Xiangyang Zhang, Qingwei Bu

    Published 2021-01-01
    “…Effective theoretical calculation methods in the current studies on the prediction of pressure relief protection effect of interbed coal and rock masses and their distribution laws are lacking. …”
    Get full text
    Article
  16. 856

    Assessment of the Excavation Damaged Zones in the Surrounding Rock of an Underground Powerhouse under High In Situ Stress Using an Acoustic Velocity Detecting Method by Liguo Zhang, Dong Wang, Jiaxing Dong

    Published 2020-01-01
    “…The assessment results show that HDZ, but not SDZ, was significantly asymmetrically distributed in the upstream (average depth of 4.1 m) and downstream (average depth of 7.5 m) high sidewalls; in partial areas, depth of HDZ exceeded the length of designed rock bolts, which indicates that rock bolts cannot restrain crack development and EDZs evolution. …”
    Get full text
    Article
  17. 857

    Study on the Instability Characteristics and Bolt Support in Deep Mining Roadways Based on the Surrounding Rock Stability Index: Example of Pansan Coal Mine by Jucai Chang, Kai He, Zhiqiang Yin, Wanfeng Li, Shihui Li, Dongdong Pang

    Published 2020-01-01
    “…In view of the influence of mining stress on the stability of the surrounding rock of inclined roof mining roadways in deep mines, the surrounding rock stability index is defined and solved based on the rock strength criterion and the stress distribution. …”
    Get full text
    Article
  18. 858

    Research on the influence of curtain grouting parameters on the stability of tunnel surrounding rock and lining structure under the action of local high water pressure by Lianhui Li, Zonglong Zhang, Changyong Nie, Xuebing Hu, Zongzhi Li, Liang Cheng, Wenfeng Zhang

    Published 2025-01-01
    “…Choosing the reasonable and economical grouting parameters is crucial for controlling the seepage field of surrounding rock and tunnel stability. This paper adopted the fluid–solid coupling theory based on FLAC3D to establish numerous simulations on the stability of surrounding rock and lining structure in karst tunnels under the different grouting conditions. …”
    Get full text
    Article
  19. 859
  20. 860

    Metasomatism and REE mineralization of the Zilair Formation sedimentary rocks in the Khudolaz complex gabbro massif exocontact zone (Chebarkul area, Southern Urals) by Evgeny I. Mikheev, Ildar R. Rakhimov, Elena O. Shaparenko, Elena I. Soroka

    Published 2025-01-01
    “…Mineralogical and geochemical characteristics of metasedimentary rocks from exocontact zone of the Khudolaz complex gabbro massif, study of rare earth minerals, determination of the formation conditions and sources of mineralizing fluids. …”
    Get full text
    Article