GUO W B，GE Z B，HU Y H，et al. Study on the movement law of aeolian sand surface without sufficient mining［J］.Journal of Henan Polytechnic University（Natural Science），doi:10.16186/j.cnki.1673-9787.2024070030

doi: doi:10.16186/j.cnki.1673-9787.2024070030

Received：2024-07-08

Revised：2024-11-27

Online：2024-12-13

Study on the movement law of aeolian sand surface without
sufficient mining

GUO Wenbing^1,2，GE Zhibo¹，HU Yuhang¹，YANG Weiqiang¹，HU Chaoqun¹，WANG Yu¹

(1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China; 2. State Collaborative Innovative Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo 454000, Henan, China)

Abstract: [Objective] In order to study the movement and deformation of the surface of the insufficiently mined aeolian sand landform, [Methods] Taking the working face 11-3105 of Menkeqing Coal Mine as the research background, the surface movement in the study area was continuously monitored by establishing a surface movement observation station, and the surface movement and deformation law of aeolian sand landform were studied by combining theoretical analysis. [Results] The measured data show that the maximum subsidence values of the surface trend and tendency are 423mm and 464mm, respectively, and the surface subsidence is small, indicating that the surface subsidence response is moderate, and the maximum subsidence velocity lag distance is 401m, and the maximum subsidence velocity hysteresis angle is 60.97°. Combined with the theory of key layers and the deflection analysis of the fixed support beam, it is found that there will be a separation space in the overlying rock layer on the working face during the settlement conduction process, which reveals the mechanism of small settlement on the surface under the buffering action of aeolian sand. Through the in-depth study of the duration of surface movement, the "area" calculation model of the duration of surface movement was constructed on the basis of calculus and geometry, the formula for calculating the duration of surface movement was given, and the duration of surface movement was predicted for the measurement points in the (super) full mining area of the 11-3105 working face and 10 different mining areas, and the minimum error between the predicted value and the measured value of some measurement points in the working face was 5d, and the maximum error was 10d. For 10 different mining areas, the minimum error between the predicted value and the measured value is 4d, and the maximum error is 34d, which is in good agreement with the measured results, which verifies the prediction accuracy and rationality of the "area" calculation model. [Conclusion] It enriches the content of the surface movement law of coal mining, and has important guiding significance for the utilization and protection of buildings and land reclamation in mining subsidence areas.

Key words: large mining depth; aeolian sand landforms; the duration of surface movement; surface subsidence; the law of movement deformation

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