毛坪铅锌矿水平矿柱形成与回采方法研究

发布时间：2018-04-13 00:12

本文选题：水平矿柱 + 临界厚度　；参考：《昆明理工大学》2017年硕士论文

【摘要】：近年来,水平分层充填采矿法(上向/下向)多采用沿矿体水平全断面开挖,机械化大盘区、无矿柱连续布置以及双中段甚至多中段同时回采的开采模式得到广泛应用。在双中段或者多中段同时回采且进路充填无法接顶时,水平矿柱必然会动态形成。因此,准确的判定水平矿柱的临界厚度,安全的对矿柱进行回收,对于有效的延长企业服务年限,充分利用有限矿产资源意义重大。本文以毛坪矿为工程背景,采用理论分析和数值模拟建立了针对水平矿柱临界厚度的判定方法。同时,对比分析了不同进路断面结构对水平矿柱形成和稳定性的影响,确定了能够安全回收水平矿柱的进路结构。论文主要的研究内容及成果如下:1、根据水平矿柱的工程特征,基于符拉索夫厚板理论,建立了水平矿柱临界厚度的判定力学模型,得出了水平矿柱的临界厚度与矿体厚度及矿体力学参数之间的关系,为矿山及时准确的判定水平矿柱临界厚度提供理论依据。2、采用有限差分数值模拟软件FLAC 3D,结合毛坪铅锌矿实际生产情况,建立了下向水平分层矩形进路式和六边形进路式充填法开采数值模型,分析了不同进路结构条件下水平矿柱的形成以及破坏过程,提出采用矩形进路进行双中段回采,将造成20m厚矿体无法回采;采用六边形进路结构,能够保证水平矿柱回采过程稳定,安全回收水平矿柱资源。3、通过数值模拟软件,分析了不同空顶距离条件下六边形进路结构开采过程,得出:六边形进路回采时采用1m空顶距,能够保证开采工作的安全且降低充填成本投入。4、本文研究结果应用于毛坪铅锌矿760中段生产实践,经统计,采用下向分层六边形进路充填采矿法共采出矿石91815.7t,采场生产能力达380t/d,矿石回收率为94%,且整个水平矿柱回收过程中未发生垮塌、片帮、冒落等安全事故。论文研究成果,进一步丰富了关于水平矿柱研究的内涵,具有重要的理论意义和工程应用价值。一方面,为矿山判定水平矿柱临界厚度提供了理论依据;另一方面,采用下向水平分层六边形进路式胶结充填采矿法,在保证矿山安全、持续及稳定发展的前提下,提高了矿石回收率和矿山经济效益,为矿山安全回收水平矿柱提供了技术参考。
[Abstract]:In recent years, the mining method of horizontal stratification and filling (upward / downward) has been widely used, such as excavation along the horizontal full section of orebody, mechanized large scale area, continuous layout of no pillar, and simultaneous mining of two or even more middle sections at the same time.The horizontal pillar is bound to form dynamically when the two or more middle sections are simultaneously mined and the road filling cannot be connected to the top.Therefore, it is of great significance to determine the critical thickness of horizontal pillar accurately and recover the pillar safely for effectively prolonging the service life of enterprises and making full use of limited mineral resources.In this paper, the critical thickness of horizontal pillar is determined by theoretical analysis and numerical simulation with Maoping mine as the engineering background.At the same time, the influence of cross section structure of different approaches on the formation and stability of horizontal pillar is analyzed, and the route structure which can safely recover horizontal pillar is determined.The main contents and results of this paper are as follows: 1. According to the engineering characteristics of horizontal pillar and based on the theory of thick plate of Fulasov, a mechanical model for determining critical thickness of horizontal pillar is established.The relationship between the critical thickness of horizontal pillar and the thickness of ore body and the mechanical parameters of orebody is obtained.This paper provides a theoretical basis for determining the critical thickness of horizontal pillar timely and accurately in the mine. The finite difference numerical simulation software FLAC 3D is used to combine with the actual production situation of Maoping lead-zinc mine.The numerical models of horizontal layered rectangular and hexagonal filling mining are established. The formation and failure process of horizontal pillar under different route structures are analyzed.Using hexagonal route structure can ensure the stability of horizontal pillar mining process, safely recover horizontal pillar resources .3. by numerical simulation software, it is necessary to use the hexagonal route structure to ensure the stability of the horizontal pillar recovery process and the safe recovery of horizontal pillar resources.In this paper, the mining process of hexagonal road structure under different space and roof distance is analyzed.It can ensure the safety of mining work and reduce the input of filling cost. The results of this paper are applied to the production practice of middle section 760 of Maoping lead-zinc mine.A total of 91815.7t ore was produced by downgrading hexagonal road filling mining, the stope production capacity reached 380 t / d, the ore recovery rate was 94 t / d, and the whole horizontal pillar recovery process did not collapse, cover, caving and other safety accidents.The research results further enrich the connotation of horizontal pillar research and have important theoretical significance and engineering application value.On the one hand, it provides a theoretical basis for determining the critical thickness of horizontal pillars; on the other hand, the down-leveled hexagonal cemented filling mining method is adopted to ensure the safety, sustainable and stable development of the mine.The ore recovery rate and mine economic benefit are improved, and the technical reference is provided for mine safe recovery level pillar.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD862

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