XU L, WANG S Y, ELMO Davide,et al.Compression-consolidation-creep-diagenesis process of compacted gangue and its equivalent mining height model analysis[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(6):27-37.

Received:2023/06/19

Revised:2023/08/03

Online:2024-09-24

Compression-consolidation-creep-diagenesis process of compacted gangue and its equivalent mining height model analysis

XU Lei1,2, WANG Siyu1, ELMO Davide3, DING Shuxue1, LIU Honglin4, LI Wenfeng5, HONG Zijie1

1.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China；2.International Joint  Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention， Henan Polytechnic University，Jiaozuo  454000，Henan，China；3.The Norman B.Keevil Institute of Mining Engineering，University of British Columbia，Vancouver，BC  V6T 1Z4，Canada；4.School of Geology and Mines Engineering，Xinjiang University，Urumqi  830046，Xinjiang，China；5.Earth and Environmental Sciences Division，Los Alamos National Laboratory，Los Alamos，NM  87545，United States

Abstract: Objectives To investigate the compression-consolidation-creep-diagenesis process of compacted gangue and its equivalent mining height model， using the 1102 gangue filling face of Tingnan Coal Mine as the engineering background，  Methods the study employed theoretical analysis， numerical simulation， laboratory tests， and field measurements.  Results The study found that the maximum roof control gap for the gangue filling face was calculated as the cutting depth plus the end face distance， top beam length， and contact distance of the rear support to the gangue. The rotation and subsidence amount of the roof equalled the maximum roof control gap multiplied by the sine of the support’s tilt angle（ht = Lmax × sin θ）. The backfill space height behind the frame equalled the mining height minus the roof’s rotation and subsidence amount， underconnecting amount， and bottom heave behind the frame. The compression-consolidation-creep-diagenesis process of compacted gangue in the fill space and their corresponding compression rates were： skeleton adjustment segment （7.42%）， slow compression segment （5.39%）， consolidation settlement segment （0.34%）， and creep-diagenesis segment （12.38%）. The total rechargeable compression rate was 25.53%. Based on the equivalent mining height， the four-stage equivalent mining height of the 1102 face was： skeleton adjustment segment （0.94 m）， slow compression segment （1.10 m）， consolidation settlement segment （1.11 m）， and creep-diagenesis segment （1.48 m）.  Conclusions Through the comparison of probability integration method prediction， numerical simulation， and subsidence observation， it was observed that the surface subsidence curves of the main section of the 1102 working face in strike and inclination were bowl-shaped. The surface subsidence curve was gentle in the first two stages and steep in the last two stages.

Key words:gangue filling;equivalent mining height;gangue compression;consolidated diagenesis