Abstract
Overburden isolation grouting filling technique can effectively control the mining-induced surface subsidence. The grouting pressure and the compaction law of rock mass in the caving zone are the most important parameters in the study of overburden isolated grouting filling technique. In this study, an experimental test on the grouting pressure and the compaction volume of the rock mass in a caving zone was carried out by a three-dimensional experiment system. During the test, the grouting pressure and the subsidence of the isolation layer in the filling area were collected in real time by the pressure and displacement sensors in the experiment system. The results show that the influence of grouting pressure on the compaction degree of rock mass in a caving zone can be divided into linear stage and strengthening stage. In the linear stage, the mining of the longwall panel is the main influencing factor; this stage is characterized by stable grouting pressure and balanced development with compaction volume. The grouting pressure in the strengthening stage increases continuously, and the compaction volume synchronously increases to the critical value to maintain the ground stability. The strengthening stage is the main stage affecting the compaction degree of the rock mass in the caving zone. Through the experimental data, the fitting function of grouting pressure and the compaction degree of the rock mass in the strengthening stage was obtained and verified. This study provides a theoretical basis for grouting pressure design of overburden isolation grouting and compaction judgment of rock mass in a caving zone.
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Data availability
The data that support the findings of this study are available from the corresponding author, [Dayang Xuan], upon reasonable request.
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Acknowledgements
This work was supported by the State Key Laboratory of Coal Resources and Safe MiningXinjiang Institute Engineering Joint Open Research Fund Project (no. SKLCRSM-XJIEKF001).
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State Key Laboratory of Coal Resources and Safe Mining Xinjiang Institute Engineering Joint Open Research Fund Project, SKLCRSM-XJIEKF001.
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Zheng, K., Xuan, D., Li, J. et al. Experimental Study on Compaction Law of Rock Mass in the Caving Zone Under the Grouting Pressure of Overburden Isolation Grouting Filling. Geotech Geol Eng 41, 1647–1659 (2023). https://doi.org/10.1007/s10706-022-02359-4
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DOI: https://doi.org/10.1007/s10706-022-02359-4