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Coal Engineering ›› 2026, Vol. 58 ›› Issue (3): 206-214.doi: 10.11799/ce202603025

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Rule of surface full cycle subsidence with repeated mining in multiple coal seams and regional division method of stability for subsidence area

  

  • Received:2025-04-06 Revised:2025-06-24 Online:2026-03-10 Published:2026-04-14

Abstract:

Discrimination of surface movement duration and residual movement deformation in multiple coal seams under repeated mining conditions is complicated. At present, there is no function equation of surface movement and deformation time for the whole life cycle under large mining depth and repeated mining conditions, and there is no zoning criterion for comprehensive treatment of subsidence area. Based on the high-precision large-deformation monitoring characteristics of surface movement observation station in the short to medium term, combined with the small deformation, long period and slow deformation characteristics monitored by InSAR, the paper applies the monitoring data of "conventional surface movement observation station +InSAR residual deformation" to fit surface movement deformation-time function equation of the mine life cycle. Surface movement cycle is divided into four stages. Based on the relevant rules and regulations, the regional criteria for stability of vegetation restoration and treatment in coal mining subsidence area are established. Based on the calculation results of surface movement and deformation, the suitable areas of surface vegetation restoration and treatment in each coal mining subsidence area are defined, and the corresponding comprehensive treatment time is proposed according to the characteristics of surface movement and deformation. Results show that the surface movement and deformation of Fengshuigou Coal Mine last for 56 days at the beginning stage, 162 days at the active stage, 167 days at the decay stage, and the cumulative surface movement time is 385 days. The combination of surface movement observation station and InSAR monitoring data can realize the high-precision and life-cycle surface movement deformation-time function equation of mine under complex conditions. The whole process of surface movement and deformation can be divided into four stages: initial stage, active stage, decline stage and residual deformation stage. Based on the moving deformation-time function equation of mine life cycle, coal mining subsidence zoning can be divided into three types: unsuitable vegetation restoration and management area, selective suitable area and suitable area.

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