Stability analysis of longwall top-coal caving face in extra-thick coal seams based on an innovative numerical hydraulic support model

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING International Journal of Mining Science and Technology Pub Date : 2024-04-01 DOI:10.1016/j.ijmst.2024.04.011

Jun Guo , Wenbo Huang , Guorui Feng , Jinwen Bai , Lirong Li , Zi Wang , Luyang Yu , Xiaoze Wen , Jie Zhang , Wenming Feng

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Abstract

The relationship between support and surrounding rock is of great significance to the control of surrounding rock in mining process. In view of the fact that most of the existing numerical simulation methods construct virtual elements and stress servo control to approximately replace the hydraulic support problem, this paper establishes a new numerical model of hydraulic support with the same working characteristics as the actual hydraulic support by integrating numerical simulation software Rhino, Griddle and FLAC3D, which can realize the simulation of different working conditions. Based on this model, the influence mechanism of the supporting strength of hydraulic support on surrounding rock stress regulation and coal stability in front of the top coal caving face in extra thick coal seam were researched. Firstly, under different support intensity, the abutment pressure of the bearing coal and the coal in front of it presents the “three-stage” evolution characteristics. The influence range of support intensity is 15%–30%. Secondly, 1.5 MPa is the upper limit of impact that the support strength can have on the front coal failure area. Thirdly, within a displacement range of 2.76 m from the coal wall, a support strength of 1.5 MPa provides optimal control of the horizontal displacement of the coal.

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基于创新型数值液压支架模型的特厚煤层长壁顶煤塌陷工作面稳定性分析

支护与围岩的关系对采矿过程中围岩的控制具有重要意义。鉴于现有的数值模拟方法大多通过构建虚拟元素和应力伺服控制来近似替代液压支架问题，本文通过集成数值模拟软件Rhino、Griddle和FLAC3D，建立了与实际液压支架工作特性相同的新型液压支架数值模型，可实现不同工况的模拟。基于该模型，研究了特厚煤层顶煤掘进工作面前液压支架支护强度对围岩应力调节和煤体稳定性的影响机理。首先，在不同支护强度下，承压煤及其前方煤体的支护压力呈现 "三阶段 "演化特征。支护强度的影响范围为 15%-30%。其次，1.5 MPa 是支护强度对前煤破坏区域的影响上限。第三，在距煤壁 2.76 米的位移范围内，1.5 兆帕的支护强度可对煤的水平位移进行最佳控制。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.