Novel Combined Mining Method: Calculation of Core Stope Structural Parameters

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Quan Gan, Qingfa Chen, Wenxiong Yang, Chenyang Liu
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引用次数: 0

Abstract

With increasing mining depth, the mining methods for steeply inclined medium‐thick ore bodies have become unsuitable. In this paper, by integrating the roof‐pillar induced caving technology, through technical fusion and reconstruction, a combined mining method of roof‐pillar induced caving and non‐pillar sublevel caving has been formulated. The five core parameters of the combined mining method (the ultimate length of the temporary top pillar a1, thickness h, maximum hanging length a2, initial induced caving step distance L1, and continuous induced caving step distance L2) are crucial for ensuring the stability of the mining system structure. A novel method combining qualitative and quantitative approaches is proposed to calculate the five core parameters. Initially, a1 is obtained through rock mass evaluation and the hydraulic radius inverse method. Subsequently, using Hu Haichang's thick plate theory, the relationship between the length and thickness of the thick plate is derived, and h and a2 are calculated by combining different trial functions and boundary conditions. Finally, L1 and L2 are determined based on the mining process of the combined mining method and the calculated values of a1, a2, and h. Taking the 37# experimental stope at the +220 m level of the Daxin manganese mine as a background, the calculated core parameters a1, h, a2, L1 and L2 are 47, 12, 39, 8, and 4.5 m, respectively. These calculated parameters ensure safe mining operations. The proposed combined mining method and core parameters calculation method can provide a technological breakthrough for the mining of medium‐depth ore bodies.
新型组合采矿方法:岩心采场结构参数计算
随着开采深度的增加,急倾斜中厚矿体的开采方法已不再适用。本文结合顶柱诱导崩落技术,通过技术融合与改造,制定了顶柱诱导崩落与无顶柱分段崩落相结合的采矿方法。联合采矿法的5个核心参数(临时顶柱极限长度a1、厚度h、最大悬垂长度a2、初始诱导崩落步距L1、连续诱导崩落步距L2)对保证采动系统结构的稳定性至关重要。提出了一种定性与定量相结合的计算五个核心参数的新方法。最初通过岩体评价和水力半径反演法得到a1。随后,利用胡海昌厚板理论,推导了厚板长度与厚度的关系,并结合不同的试函数和边界条件计算了h和a2。最后,根据联合采矿法的开采工艺及a1、a2、h的计算值确定L1、L2。以大新锰矿+220 m水平37#实验采场为背景,计算出的岩心参数a1、h、a2、L1、L2分别为47、12、39、8、4.5 m。这些计算出的参数确保了采矿作业的安全。所提出的联合采矿方法与岩心参数计算方法为中深部矿体开采提供了技术突破。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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