6
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Stress Evolution Law of Surrounding Rock with Gob-Side Entry Retaining by Roof Cutting and Pressure Release in Composite Roof

      1 , 2 , 3 , 4 , 1 , 1 , 1 , 2
      Advances in Materials Science and Engineering
      Hindawi Limited

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          The stress concentration of gob-side entry surrounding rock is a hot topic in coal mining. In this paper, through theoretical analysis and numerical simulation, the pressure relief mechanism of the gob-side entry retaining by roof cutting and pressure release (RCPR) and the spatiotemporal development law of surrounding rock stress of the gob-side entry were analyzed. The studies showed that the gob-side entry retaining by RCPR shortened the length of the lateral cantilever by directional roof cutting, which weakened the stress level of the gob-side entry. In the meantime, the goaf gangues could play a good filling role by using their breaking and swelling characteristics under the action of gangue-blocking supports and further optimized the stress environment along the roadway. Field industrial tests verified that the gob-side entry retaining by RCPR had a significant effect on pressure relief, and the surrounding rock stress and deformation tended to stabilize after about 160 m of lagging working face. Numerical analysis reproduced the whole process of “mining-retention-using” of roof cutting roadway and revealed that surrounding rocks were always in the zone of relative stress reduction during the whole process. The peak value of mining-induced lateral stress was about 10 m away from the middle point of the gob-side entry. The change of surrounding rock stress could be divided into three stages: significant increase, dynamic adjustment, and stable stage. However, during the second mining, the stress connected zone would appear on the leading working face, and the stress concentration in this zone was significant. Based on the above analysis, we concluded that the new technology could be applied to the medium-thickness coal seam in the composite roof.

          Related collections

          Most cited references17

          • Record: found
          • Abstract: not found
          • Article: not found

          Study of a no-pillar mining technique with automatically formed gob-side entry retaining for longwall mining in coal mines

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            An innovative approach for gob-side entry retaining in highly gassy fully-mechanized longwall top-coal caving

              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found
              Is Open Access

              An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining

                Bookmark

                Author and article information

                Contributors
                Journal
                Advances in Materials Science and Engineering
                Advances in Materials Science and Engineering
                Hindawi Limited
                1687-8434
                1687-8442
                August 13 2020
                August 13 2020
                : 2020
                : 1-15
                Affiliations
                [1 ]State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
                [2 ]School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
                [3 ]College of Mechanical and Architectural Engineering, Taishan University, Tai’an, Shandong 271000, China
                [4 ]Department of Civil Engineering, Nanyang Institute of Technology, Nanyang, Henan 473004, China
                Article
                10.1155/2020/1961680
                66d2f5e6-c4f5-4477-9ec3-8c4e32b043ca
                © 2020

                http://creativecommons.org/licenses/by/4.0/

                History

                Comments

                Comment on this article