Influence of backfilling rate on the stability of the “backfilling body-immediate roof” cooperative bearing structure

To reduce the cost of backfilling coal mining and utilize the underground space of coal mines, a new backfilling mining method with low backfilling rate called constructional backfilling coal mining (CBCM) is proposed. The “backfilling body-immediate roof” cooperative bearing structure of CBCM is an...

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Bibliographic Details
Published inInternational journal of mining science and technology Vol. 32; no. 6; pp. 1197 - 1206
Main Authors Du, Xianjie, Feng, Guorui, Zhang, Min, Wang, Zehua, Liu, Wenhao
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.11.2022
Elsevier
Subjects
Backfilling rate
Constructional backfilling coal mining
Cooperative bearing structure
Immediate roof
Medium thick plate on elastic foundation
Overlying strata
Overlying strata
Backfilling rate
Cooperative bearing structure
Medium thick plate on elastic foundation
Immediate roof
Constructional backfilling coal mining
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Summary:To reduce the cost of backfilling coal mining and utilize the underground space of coal mines, a new backfilling mining method with low backfilling rate called constructional backfilling coal mining (CBCM) is proposed. The “backfilling body-immediate roof” cooperative bearing structure of CBCM is analyzed by establishing the model of the medium thick plate on an elastic foundation. The influence of the backfilling rate on the stability of overlying strata is analyzed by the numerical simulation experiment. The control effect of CBCM is verified by a physic similar simulation test. The economic benefit of CBCM is analyzed. The conclusions are: the deformation characteristics of the immediate roof and critical backfilling spacing in CBCM can be analyzed based on the Hu Haichang’s theory. Exerting the bearing capacity of the immediate roof is beneficial to the stability of the overlying strata. The CBCM has a good control effect on the overburden in Xinyang Mine when the backfilling rate is lower than 25%. The backfilling cost of per ton coal is 37.39 yuan/t when the backfilling rate is 13.7%, with a decrease rate of 56.63% than the full-filling. The research results can provide theoretical support for the application of CBCM in coal mining.
ISSN:2095-2686
DOI:10.1016/j.ijmst.2022.09.003