Study on floor instability law of cemented filling mining above a confined aquifer

Q4 Engineering

Scientific Mining Journal Pub Date : 2023-07-25 DOI:10.30797/madencilik.1077583

Jiaqi Wang

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Abstract

To solve the problem of floor water inrush in the process of coal mining on a confined aquifer and study the law of floor instability, a cemented filling mining method is proposed in the paper. Using river sand and cement as filling materials, the cementitious material with a concentration of 75% and cement content of 15% has the best flow and mechanical properties. Based on the elastic half-space theory and the bearing characteristics of the backfill, the mechanical model of floor stability is established, the critical criterion of floor instability is proposed, and the relationship between the failure depth of floor and the location and pressure of confined aquifer is obtained. The numerical simulation test scheme is designed, and the FLAC3D fluid-structure coupling element is used to explore the instability characteristics of the floor in the mining process. The research results show that the failure depth of the floor will gradually decrease with the increase of the strength of filling materials, the increase of aquifer distance, and the decrease of water pressure. The research results provide a useful reference for the study of safe mining of coal resources on a confined aquifer.

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承压含水层上方胶结充填开采底板失稳规律研究

为解决承压含水层开采过程中底板突水问题，研究底板失稳规律，提出了一种胶结充填采矿方法。以河砂和水泥为填料，水泥含量为15%、浓度为75%的胶凝材料具有最佳的流动性和力学性能。基于弹性半空间理论和回填土的承载特性，建立了底板稳定性的力学模型，提出了底板失稳的临界准则，得到了底板破坏深度与承压含水层位置和压力之间的关系。设计了数值模拟试验方案，并采用FLAC3D流固耦合单元对开采过程中底板的失稳特性进行了研究。研究结果表明，随着填料强度的增加、含水层距离的增加和水压的降低，底板的破坏深度将逐渐减小。研究结果为承压含水层上煤炭资源的安全开采研究提供了有益的参考。

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来源期刊

Scientific Mining Journal Engineering-Industrial and Manufacturing Engineering

CiteScore

0.60

自引率

0.00%

发文量

期刊介绍： Scientific Mining Journal, which is published i n open access electronic environment and i n printed, is a periodical scientific journal of Union of Chambers of Turkish Engineers and Architects Chamber of Mining Engineers. The name of the journal was "Mining" until June 2016 and it has been changed to "Scientific Mining Journal" since September 2016 because it can be confused with popular journals with similar names and the ISSN number has been updated from 0024-9416 to 2564-7024. Scientific Mining Journal, published four times a year (March-June-September-December), aims to disseminate original scientific studies which are conducted according to the scientific norms and publication ethics at national and international scale, to scientists, mining engineers, the public; and thus to share scientific knowledge with society. The journal is in both Turkish and English. The journal covers theoretical, experimental, and applied research articles, which reflects the findings and results of an original research i n the field of mining engineering; review articles, which assess, evaluates, and interprets the findings of a comprehensive review of sufficient number of scientific articles and summarize them at present information and technology level; technical notes, which may be defined as a short article that describes a novel methodology o r technique; a case studies, which are based on the theoretical o r real professional practice and involves systematic data collection and analysis.

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