采矿诱发覆盖层岩石的破坏特征与断裂机理:中国案例研究

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Jiawei Li, Meng Zhang, Changxiang Wang, Changlong Liao, Baoliang Zhang
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引用次数: 0

摘要

本研究采用类似模拟试验和离散元模拟耦合的方法,分析了模型煤层顶板的破坏和变形过程。覆盖层岩石的塌陷区分为三个区域:分层断裂带、破碎断裂带和压实带。分层断裂带的孔隙率范围在 0.2 至 0.3 之间,而顶板其余部分的孔隙率主要小于 0.1。此外,数值模型的应力分析表明,从 160 米开始,覆岩的位移带形成了 "拱梁 "结构,最大和最小应力值随着推进距离的增加而减小。在覆岩的应力梁区间,随着推进距离的增加,最大应力值呈周期性变化。根据现场观测数据与数值模拟结果的对比分析,数值模拟的应力数据与现场检测的实际结果基本一致,说明数值模拟结果是正确的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Failure characteristics and fracture mechanism of overburden rock induced by mining: A case study in China

Failure characteristics and fracture mechanism of overburden rock induced by mining: A case study in China

This study employs similar simulation testing and discrete element simulation coupling to analyze the failure and deformation processes of a model coal seam's roof. The caving area of the overburden rock is divided into three zones: the delamination fracture zone, broken fracture zone, and compaction zone. The caving and fracture zones' heights are approximately 110 m above the coal seam, with a maximum subsidence of 11 m. The delamination fracture zone's porosity range is between 0.2 and 0.3, while the remainder of the roof predominantly exhibits a porosity of less than 0.1. In addition, the numerical model's stress analysis revealed that the overburden rock's displacement zone forms an 'arch-beam' structure starting from 160 m, with the maximum and minimum stress values decreasing as the distance of advancement increases. In the stress beam interval of the overburden rock, the maximum value changes periodically as the advancement distance increases. Based on a comparative analysis between observable data from on-site work and numerical simulation results, the stress data from the numerical simulation are essentially consistent with the actual results detected on-site, indicating the validity of the numerical simulation results.

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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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