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The prediction of mine pit inflow and the spatio-temporal variation of groundwater seepage fields in underground mines is of great significance for mine water control engineering, which is directly related to mine safety production and environmental protection. A copper-cobalt mine in the Democratic Republic of Congo (DRC) is located in a small nappe within the Zambia-DRC metallogenic belt, featuring complex hydrogeological conditions. If the traditional drainage scheme is adopted, the predicted mine pit inflow will exceed 46 000 m3/d. Through on-site hydrogeological condition investigation, a single-layer control drainage scheme was proposed by utilizing the vertical multi-layer structure of the mining area's aquifer and the principle of control drainage. By applying the theory of groundwater flow and numerical simulation techniques, a three-dimensional groundwater numerical model was established to accurately reflect the hydrogeological characteristics of the mining area. Combined with the optimization of drainage borehole layout scheme based on water gushing points during underground development, the prediction shows that the mine pit inflow during the mining period of the 940 m level can be reduced to 25 260 m3/d. The mine has been constructed according to the optimized control drainage scheme, achieving pressure-controlled mining in the first mining section. Compared with the traditional drainage scheme, it saves approximately 2.34 million US dollars in drainage costs annually. The single-layer control drainage method can provide a reference for similar high-water mines in Africa, thereby achieving the reduction of mine pit inflow, protection of mining area water resources, and efficient pressure-controlled mining.

, authors=Liang WANG1, Long TENG2, 3, 4, Chao LIU1, Junsheng MA1, Shuai ZHANG1, Chao GAO2, 3, 4, authorsList=Liang WANG, Long TENG, Chao LIU, Junsheng MA, Shuai ZHANG, Chao GAO, authorCompany=null, correspAuthors=Long TENG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322158392324502513, articleId=1322158389141025751, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=基于地下水数值模拟的控制疏干方案优化及矿坑涌水量预测, columnId=1226462295417598973, journalTitle=矿业研究与开发, columnName=矿山安全与环保, runingTitle=null, highlight=null, articleAbstract=

地下矿山的矿坑涌水量及地下水渗流场时空变化的预测对于矿山防治水工程具有重要意义,直接关系到矿山安全生产和环境保护。刚果(金)某铜钴矿位于“赞比亚-刚果(金)”成矿带的一个小型推覆体中,水文地质条件复杂。若采用传统疏干方案,预计矿坑涌水量将超46 000 m3/d。通过现场水文地质条件调查,利用矿区含水层垂向存在的多元结构和控制梳干原理,提出单层控制疏干方案。运用地下水流动理论和数值模拟技术,建立了能准确反映矿区水文地质特征的三维地下水数值模型。结合井下开拓期间的涌水点优化疏干钻孔布设方案,并预测940 m中段开采期的矿坑涌水量可降低至25 260 m3/d。矿山按优化后的控制疏干方案施工,实现了首采矿段带压开采,相对于传统疏干方案,每年节约排水费用约234 万美元。单层控制疏干方法可为非洲类似大水矿山提供借鉴,从而实现降低矿坑涌水量、保护矿区水资源,达到高效带压开采。

, authors=王亮1, 滕龙2, 3, 4, 刘超1, 马俊生1, 张帅1, 高超2, 3, 4, authorsList=王亮, 滕龙, 刘超, 马俊生, 张帅, 高超, authorCompany=null, correspAuthors=滕龙, authorNote=

王亮(1986—),男,山东烟台人,硕士,高级工程师,主要研究方向为金属矿山防治水技术、矿山开采建设安全技术与应用。E-mail:

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滕龙(1994—),男,湖北恩施人,硕士,工程师,主要研究方向为矿山水害防治理论与技术、地下水数值模拟技术及应用。E-mail:
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王亮(1986—),男,山东烟台人,硕士,高级工程师,主要研究方向为金属矿山防治水技术、矿山开采建设安全技术与应用。E-mail:

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王亮(1986—),男,山东烟台人,硕士,高级工程师,主要研究方向为金属矿山防治水技术、矿山开采建设安全技术与应用。E-mail:

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3.金属矿山安全技术国家重点实验室,湖南 长沙 410012
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Initial hydrogeological parameters of the model

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序号层名岩性渗透系数K/(m/d)给水度弹性储水系数
1第四系弱含水层第四系3.60.55.00E-04
全风化白云岩5.40.3
粉质黏土0.030.15
构造角砾岩0.0080.02
2浅部岩溶裂隙含水层硅质白云岩3.30.251.00E-04
块状白云岩2.80.20
白云质页岩2.50.20
3中部含叠层石白云岩相对隔水层含叠层白云岩0.0030.11.00E-05
其余白云岩0.020.15
4深部矿体岩溶裂隙含水层R2白云岩0.137~0.6360.11.00E-04
构造角砾岩0.0020.021.00E-05
砂岩0.0050.01
5~8巷道及采场层同上
9模型底部砂岩0.0050.011.00E-05
), ArticleFig(id=1322158398230081594, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322158389141025751, language=CN, label=表1, caption=

模型初始水文地质参数

, figureFileSmall=null, figureFileBig=null, tableContent=
序号层名岩性渗透系数K/(m/d)给水度弹性储水系数
1第四系弱含水层第四系3.60.55.00E-04
全风化白云岩5.40.3
粉质黏土0.030.15
构造角砾岩0.0080.02
2浅部岩溶裂隙含水层硅质白云岩3.30.251.00E-04
块状白云岩2.80.20
白云质页岩2.50.20
3中部含叠层石白云岩相对隔水层含叠层白云岩0.0030.11.00E-05
其余白云岩0.020.15
4深部矿体岩溶裂隙含水层R2白云岩0.137~0.6360.11.00E-04
构造角砾岩0.0020.021.00E-05
砂岩0.0050.01
5~8巷道及采场层同上
9模型底部砂岩0.0050.011.00E-05
), ArticleFig(id=1322158398330744891, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322158389141025751, language=EN, label=Table 2, caption=

Parameters of downhole water gushing points during the unstable period

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涌水点XYH/mQ/(m3/h)
W-1262 861.80292 322.661 16550
W-2262 716.09291 692.981 0435
W-3262 344.32291 404.941 09160
W-4262 717.77291 510.441 03020
W-5263 429.51292 034.6298050
W-6262 865.15291 405.7298050
W-7262 942.24291 490.7197035
W-8263 027.66291 529.3797035
W-9263 192.38292 646.6296030
W-10263 264.46291 706.8096030
W-11263 368.55291 724.3996030
W-12263 124.19291 580.1496030
), ArticleFig(id=1322158398418825276, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322158389141025751, language=CN, label=表2, caption=

非稳定时期井下涌水点参数

, figureFileSmall=null, figureFileBig=null, tableContent=
涌水点XYH/mQ/(m3/h)
W-1262 861.80292 322.661 16550
W-2262 716.09291 692.981 0435
W-3262 344.32291 404.941 09160
W-4262 717.77291 510.441 03020
W-5263 429.51292 034.6298050
W-6262 865.15291 405.7298050
W-7262 942.24291 490.7197035
W-8263 027.66291 529.3797035
W-9263 192.38292 646.6296030
W-10263 264.46291 706.8096030
W-11263 368.55291 724.3996030
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基于地下水数值模拟的控制疏干方案优化及矿坑涌水量预测
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王亮 1 , 滕龙 2, 3, 4 , 刘超 1 , 马俊生 1 , 张帅 1 , 高超 2, 3, 4
矿业研究与开发 | 矿山安全与环保 2025,45(7): 191-198
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矿业研究与开发 |矿山安全与环保 2025 , 45 (7) : 191 -198
基于地下水数值模拟的控制疏干方案优化及矿坑涌水量预测
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王亮(1986—),男,山东烟台人,硕士,高级工程师,主要研究方向为金属矿山防治水技术、矿山开采建设安全技术与应用。E-mail:

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王亮(1986—),男,山东烟台人,硕士,高级工程师,主要研究方向为金属矿山防治水技术、矿山开采建设安全技术与应用。E-mail:

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3.金属矿山安全技术国家重点实验室,湖南 长沙 410012
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王亮1 , 滕龙2, 3, 4 , 刘超1, 马俊生1, 张帅1, 高超2, 3, 4
作者信息
  • 1.北方矿业有限责任公司,北京 100053
  • 2.长沙矿山研究院有限责任公司,湖南 长沙 410012
  • 3.金属矿山安全技术国家重点实验室,湖南 长沙 410012
  • 4.湖南省矿山地质灾害防治与环境再造工程技术研究中心,湖南 长沙 410012
通讯作者:
滕龙(1994—),男,湖北恩施人,硕士,工程师,主要研究方向为矿山水害防治理论与技术、地下水数值模拟技术及应用。E-mail:
作者简介:

王亮(1986—),男,山东烟台人,硕士,高级工程师,主要研究方向为金属矿山防治水技术、矿山开采建设安全技术与应用。E-mail:

Optimization of Control Drainage Scheme and Prediction of Mine Pit Inflow Based on Groundwater Numerical Simulation
Liang WANG1 , Long TENG2, 3, 4 , Chao LIU1, Junsheng MA1, Shuai ZHANG1, Chao GAO2, 3, 4
Affiliations
  • 1.Norin Minging Co., Ltd., Beijing 100053, China
  • 2.Changsha Institute of Mining Research Co., Ltd., Changsha, Hunan410012, China
  • 3.State Key Laboratory of Metal Mine Safety Technology, Changsha,Hunan 410012, China
  • 4.Hunan Engineering Research Center of Prevention and Management of Mine Geological Hazard and Environmental Reconstruction, Changsha, Hunan 410012, China
出版时间: 2025-07-25
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地下矿山的矿坑涌水量及地下水渗流场时空变化的预测对于矿山防治水工程具有重要意义,直接关系到矿山安全生产和环境保护。刚果(金)某铜钴矿位于“赞比亚-刚果(金)”成矿带的一个小型推覆体中,水文地质条件复杂。若采用传统疏干方案,预计矿坑涌水量将超46 000 m3/d。通过现场水文地质条件调查,利用矿区含水层垂向存在的多元结构和控制梳干原理,提出单层控制疏干方案。运用地下水流动理论和数值模拟技术,建立了能准确反映矿区水文地质特征的三维地下水数值模型。结合井下开拓期间的涌水点优化疏干钻孔布设方案,并预测940 m中段开采期的矿坑涌水量可降低至25 260 m3/d。矿山按优化后的控制疏干方案施工,实现了首采矿段带压开采,相对于传统疏干方案,每年节约排水费用约234 万美元。单层控制疏干方法可为非洲类似大水矿山提供借鉴,从而实现降低矿坑涌水量、保护矿区水资源,达到高效带压开采。

大水矿山  /  控制梳干  /  涌水量  /  数值模拟

The prediction of mine pit inflow and the spatio-temporal variation of groundwater seepage fields in underground mines is of great significance for mine water control engineering, which is directly related to mine safety production and environmental protection. A copper-cobalt mine in the Democratic Republic of Congo (DRC) is located in a small nappe within the Zambia-DRC metallogenic belt, featuring complex hydrogeological conditions. If the traditional drainage scheme is adopted, the predicted mine pit inflow will exceed 46 000 m3/d. Through on-site hydrogeological condition investigation, a single-layer control drainage scheme was proposed by utilizing the vertical multi-layer structure of the mining area's aquifer and the principle of control drainage. By applying the theory of groundwater flow and numerical simulation techniques, a three-dimensional groundwater numerical model was established to accurately reflect the hydrogeological characteristics of the mining area. Combined with the optimization of drainage borehole layout scheme based on water gushing points during underground development, the prediction shows that the mine pit inflow during the mining period of the 940 m level can be reduced to 25 260 m3/d. The mine has been constructed according to the optimized control drainage scheme, achieving pressure-controlled mining in the first mining section. Compared with the traditional drainage scheme, it saves approximately 2.34 million US dollars in drainage costs annually. The single-layer control drainage method can provide a reference for similar high-water mines in Africa, thereby achieving the reduction of mine pit inflow, protection of mining area water resources, and efficient pressure-controlled mining.

High-water mine  /  Control drainage  /  Mine pit inflow  /  Numerical simulation
王亮, 滕龙, 刘超, 马俊生, 张帅, 高超. 基于地下水数值模拟的控制疏干方案优化及矿坑涌水量预测. 矿业研究与开发, 2025 , 45 (7) : 191 -198 .
Liang WANG, Long TENG, Chao LIU, Junsheng MA, Shuai ZHANG, Chao GAO. Optimization of Control Drainage Scheme and Prediction of Mine Pit Inflow Based on Groundwater Numerical Simulation[J]. Mining Research and Development, 2025 , 45 (7) : 191 -198 .
矿山涌水量预测在矿业工程中具有重要意义,直接关系到矿山安全生产和环境保护。目前,矿山涌水量预测主要采用统计方法和数值模拟方法。统计方法通过分析历史数据,采用回归分析、时间序列分析等方法进行预测[1]。这些方法简便易行,但对数据质量和数量有较高要求。数值模拟方法则基于地下水流动理论,利用有限元、有限差分等数值方法建立水文地质模型,模拟矿山涌水过程[2-5]。数值模拟方法能较好地反映复杂水文地质条件下的涌水动态,但对模型参数和初始条件的依赖性较强[6-8]。目前矿山涌水量的预测面临着诸多挑战,比如复杂的地质条件、多变的气候因素以及人类活动的影响[9-10],这些因素使得预测具有较高的不确定性,仍需不断探索新方法和新技术,以应对复杂多变的实际情况,确保矿山的安全生产和环境保护[11-13]。
卡莫亚铜钴矿处于著名的中非铜矿成矿带中,矿产资源条件优良。矿区的地下水位约在海拔1 310 m,在工程的开展过程中,斜坡道及竖井等工程结构会进入含水层中,地下水可能对基建工程构成安全威胁[14-16]。前期通过经验公式计算,未来采矿作业时,若按照传统疏干方案,预计排水量将超过46 000 m3/d,迫切需要进一步研究经济合理的疏干方案,以保证矿体的安全回采,并减少长期排水的运营成本。
图1为研究区的地质简图。卡莫亚矿的矿床位于一个小型的推覆体之中,矿区地层自下而上主要是上孔德龙古群(Ks)粉砂岩、中元古界加丹加群的罗安群(R)白云岩含矿地层及第四系(Q)松散层。逆冲推覆作用将深部较老的罗安群矿山亚群(R2)的含矿地层逆冲推覆至浅部,上覆于相对较新的上孔德龙古群。矿区经历多次推覆运动,相互叠加,从上到下有两套完整或不完整的R2矿山段地层,在垂向上地层划分为浅部R2段、深部R2段两个地质体,深部R2段矿体的赋存标高约为940~1 270 m,矿区地表标高约1 400 m。
构造发育的形式和强度是控制本区主要含水层富水性的主导因素。矿区的F2逆冲推覆断层及其下盘条带状粉砂岩(Ks)地层为矿区西、北、东三面的隔水边界;矿区南面由F1断层及其上推使倾向朝南的木瓦夏亚群往北逆冲推覆在“卡莫亚-坎博韦推覆体”之上,为矿区南部的弱补给边界,在雨季南部地表分水岭内的风化裂隙水侧向补给,冲沟地表水对矿区浅部R2含水层渗漏补给。地层的岩性结构特征对含水层的透水性具有显著影响。在研究区内,由于地层岩性结构的异质性,含水层透水性在空间分布上表现出较强的非均质性。同时,由于研究区域内部构造的活跃性,特别是在R2区域,部分岩组的岩层厚度相对较小,这导致了R2区域的白云岩含水层之间存在紧密的水力联系。这种水力联系促使这些含水层构成了一个统一的地下水含水系统。
卡莫亚矿区的地下水系统结构复杂,按地下水赋存条件可分为松散岩类孔隙水、碎屑岩类裂隙水和碳酸盐岩类岩溶裂隙水三种类型。碎屑岩裂隙水透水性弱,主要分布于矿区外围;碳酸盐岩岩溶裂隙水透水性强,主要分布于矿区内部,富水性显著,但空间分布不均。
矿区的主要水补给来源为大气降水。研究区的降水量较为丰沛,加之适宜的降水入渗条件,共同确保了地下水补给过程的稳定性。在自然状态下,矿区地下水呈现自南西向东北的径流特征。自1962年坎博韦矿区开始开采以来,伴随着疏干排水的影响,卡莫亚矿区的地下水位出现了显著下降,导致地下水的流动方向发生了改变,向东流入坎博韦矿区。此外,矿区南部和西部的弱含水层中的浅层地下水,通过谷底下降泉的形式进行排泄,随后汇集成河流,继续沿东北方向进行径流。
卡莫亚矿区地质构造复杂,含水层受构造运动影响显著。区域褶皱和断层发育,构造形式和强度控制了主要含水层的富水性。矿区东、西、北三面以F2逆冲断层为界,断层下盘为条带状粉砂岩(Ks)弱含水层,其与推覆体内部存在较高水位差,因此可视为隔水边界。南面以F1断层为界,断层上盘为木瓦夏亚群弱-强含水层,可作为弱补给边界。研究区含水层结构如图2所示。
矿区含水层在剖面上存在多元结构(见图2),就可能出现“两层水”现象。所谓“两层水”,就是在巨厚的含水体中,通过单层或下层放水(或抽水),使天然状态下具有同一个水位的同一个含水体中形成上、下两个(或两个以上)水位,在放水的全过程中,这两个水位长期并存而不消失。它不同于传统的两个含水层,也不同于一个含水层中的垂直分带或“上强下弱”的现象,而是一个新概念,实质上是含水层在人工活动下的一种动态反映,也可以称为“人工双层水位”。“两层水”的形成机理是地下水在渗流过程中,由于条件的改变而使水流在某个范围内形成一种水流间断现象,在间断区域内,地下水流线产生间断而不连续,为了满足能量守恒定律,地下水流则以水头补偿的形式表现出来,这就形成了“两层水”。由于各种地质原因,含水层在剖面上往往是不连续的,而且这种不连续会呈现规律性变化,这个规律就是含水层的渗透性从上到下呈现出“强→弱→次强(或强)”变化的三元结构。具备这种三元结构才有可能在下层单独疏干的条件下形成“两层水”现象。
单层疏干法作为一种有效的矿山水害防治技术,其核心理念包括疏干、避水、堵水和带压开采四个关键步骤。在这一方法中,“疏干”是指对下层含水层进行排水,通过设置放水孔或截水孔,对矿区周边的侧向水补给以及矿区内部的垂向水补给进行有效的疏干或截流,以确保采矿作业的安全性。“避水”策略则是利用地质结构中的弱透水层或设置防水矿柱,对上部的强含水层及富水断裂带进行有效的规避。这一措施旨在减少矿坑内的涌水量,同时控制地面沉降的范围,以维护矿区的稳定性。整体而言,单层疏干法通过综合运用上述技术手段,实现对地下水的有效管理和控制,以保障矿山开采的安全性和效率。“堵水”是针对沟通上下含水层的“天窗”、构造裂隙、断裂及未封钻孔进行注浆堵水,人为造成“两层水”,达到保护矿区水资源、防止地面塌陷等目的。“带压开采”主要是对上层水而言,由于上层水不完全疏干,地下水位高挂在采矿工作面之上,对采矿来说,整个采矿过程都处于带水压作业的状态。但因为上、下两层水之间经过注浆改造的岩层坚硬完整、厚度大,又采用了尽量不破坏顶板的采矿方法,且井下有较大的排水能力做保障,因此带压开采仍然是安全的。
本矿深部矿体岩溶裂隙含水层与浅部岩溶含水层间有近120 m厚的含叠层石白云岩隔水层,深部与浅部没有直接的水力联系,为保证单层疏干法顺利实施,形成较理想的两层水位,拟开展超前探水、水位监测、下层疏干试验、留设防水矿柱、注浆堵水、封堵钻孔、下层疏干(或截水)、采矿方法匹配及预留安全高度等方面的工作,见图3。
数值法应用于矿井涌水量预测的优势明显,除了能较真实地刻画矿区的水文地质条件外,还能量化各种复杂的开采条件和各种类型与强度的疏干过程,反映预报区内疏干过程中各种水文地质条件的变化以及疏干对天然排泄点水量的袭夺,因而能实现其他评价方法无法实现的目标。
卡莫亚铜钴矿床及其东邻的坎博韦铜钴矿床共同赋存于“卡莫亚-坎博韦推覆体”内。推覆体东西向展布,长6 km、宽0.7~1.8 km,面积约5.5 km2。矿区的东、西、北三面可作为隔水边界,南面为弱补给边界。
根据矿区地下水流系统特征,上部含水层与深部含水层以中等-强富水为主,地下水运动以水平向为主,即概化为平面二维流;基岩含叠层石白云岩相对隔水层中地下水运动以垂向为主,即作为主含水层的越流层处理。因此可把研究区地下水概化为非均质各向异性三维流。
模拟区东西方向长约5 550 m,南北方向宽700~2 000 m,面积约5.5 km2,地面高程为海拔1 400.03 m至1 545.43 m。用三角网络(Triangle Mesh)对模型进行划分,在岩性分界处、开拓巷道、涌水点及疏干钻孔等位置进行加密。垂向上,按含水层结构以钻孔插值数据进行分层,980 m以下至940 m中段每10 m为一个分层,以900 m标高为模型底部,共剖分9层、10片。三维网格共计有结点12 750个,有限单元227 376个。时间剖分按天然期和施工期进行划分,每个阶段的时间步长采用软件自动剖分。数值模型如图4所示。
对构建好的数值模型采用 PEST程序对各分区的水文地质参数进行反演调整,反演调整的目标函数见式(1),通过迭代计算约束拟合误差,使E值达到最小,最终实现对模型水文地质参数的优化。
式中:E为目标函数;n为时段总数;m为观测孔总数;Wj为权重系数;为对应于i时段第j号地下水动态观测孔的计算水头;为i时段第j号地下水动态观测孔的实际测量水头。
优化后的参数见表1,经过参数优化后模型的均方根误差(RMSE)值能够达到0.087,矿区二期34个长期观测钻孔水位的观测值与模拟值的最大误差为2.13 m,误差超过2 m的仅有两个钻孔,其余均在2 m以下,相对误差最大为0.16%,说明参数优化后的模型具有较高的仿真精度,能够准确地预测矿区地下水的变化趋势。
模型的仿真性能达到初步要求之后,结合2022年10月井下涌水点实地调查,在模型不同层位设置概化后对应的涌水点,涌水设置见图5,涌水点的平面坐标(X,Y)和高程H及涌水量Q见表2,进行一年的非稳定流模拟,同时对比观测井ZKS36-4的观测数据与模拟数据(见图6),进一步验证模型仿真性能。结果表明,模型能够较为准确地刻画矿区地下水的动态变化过程。
为了模拟不同疏干工况下,矿区地下水流场的变化情况,本次研究设计了两种疏干方案。方案一布置了8个疏干点位,每个点位包含3个疏干钻孔,共24个疏干钻孔,见图7(a)。方案二布置了11个疏干点位,每个点位包含3个疏干钻孔,共33个疏干孔,见图7(b)。模拟不同疏干方案下矿区地下水降至稳定状态所需时长。将疏干孔按设计方位、长度、仰角等设置输入模型,处理为线汇,将其节点设为渗流边界,渗流边界的水头值为其位置水头,以此模拟自然条件下疏干孔的工作模式[17-19]。当首采采场区域水头降为960 m以下时,结束模拟。疏干方案一的模拟运行115 d后达到要求,疏干方案二的模拟运行77 d后达到要求。不同疏干方案对应的地下水流场如图8所示。
由图8(a)可知,采用方案一疏干115 d后,首采采场大部分区域水头已经降至960 m以下;采用方案二疏干77 d后可以达到同样的效果。方案一虽然需要较长的疏干时间,但较方案二少了9个钻孔,降低了工程成本。综合考虑施工成本及疏干效率,推荐使用方案一来开展工程实践。
根据首采采场疏干初步设计,以方案一实施完成后的流场状态为初始条件,进一步开展200 d的采矿期间数值模拟。据模型预测,采矿期间940 m中段正常涌水量为25 260 m3 /d。渗流场模拟结果如图9所示。完成井下疏干并开始正常采矿活动后,浅层渗流场形态变化不大,但卡莫亚区域浅层整体水位下降明显,1 250 m等水位线外移明显,大部分浅层区域水位下降20~30 m,因巨厚含叠层石白云岩的相对隔水作用,浅层含水层最低水位一直持续在1 240 m左右,浅层地下水通过该层越流补给深部,而深层流场形态变化明显,由原本的出水点控制变为疏干井和开采面控制,采场区域水头整体下降到980 m以下,平均水位下降70~80 m。平面上,浅层区域两矿中间地带等水位线密集、水力梯度大,卡莫亚区域流场平缓;深层区域,采场两侧水力梯度较大,采场内部水力梯度很小,水位基本保持不变。垂向上,浅层水与深层水始终存在约200 m的水头差,在辅以有效的工程措施(如封堵“天窗”、钻孔及构造裂隙,留防水矿柱等)保证含叠层白云岩隔水层完整的情况下,可人为造成“两层水”,最大限度降低涌水量,保护矿区水资源,达到高效带压开采。
(1)在充分了解刚果(金)卡莫亚铜矿的矿区地质、水文地质条件的基础上,利用数值模拟技术分析该矿山开采过程中地下水流场的变化特征,通过合理的参数分区设置及参数优化构建的数值模型能够实现地下水流场的准确预测,揭示矿区地下水运动规律。
(2)通过不同疏干方案的疏干效果数值模拟,发现结合井下现有涌水点,另设8个疏干点位(24个疏干钻孔)的疏干方案就能达到降低水头至960 m的工程要求,可大大节省疏干工程成本。
(3)数值模型的预测结果显示,实施控制疏干方案后,该矿区可正常采矿,940 m中段的正常涌水量约为25 260 m3/d,远低于传统疏干方案的46 000 m3/d。单层疏干的控制疏干方案可为“赞比亚—刚果(金)”成矿带类似矿山提供借鉴,从而降低矿井涌水量、保护矿区水资源,达到高效带压开采的目的。
(4)刚果(金)卡莫亚铜钴矿按优化后的单层控制疏干方案施工,现已实现首采矿段高效采矿,当前井下涌水量为21 000 m3/d,预计整个中段开采后涌水量不超过25 000 m3/d,与模型预测结果一致。该疏干方案每年可为矿山节省排水费用超234 万美元,矿山生产15 a可节约电费3 500 万美元。
  • 中国五矿集团有限公司全国重点实验室专项资金项目(WKZB2412BJ0402105)
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2025年第45卷第7期
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  • 接收时间:2024-07-31
  • 首发时间:2026-10-28
  • 出版时间:2025-07-25
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  • 收稿日期:2024-07-31
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中国五矿集团有限公司全国重点实验室专项资金项目(WKZB2412BJ0402105)
作者信息
    1.北方矿业有限责任公司,北京 100053
    2.长沙矿山研究院有限责任公司,湖南 长沙 410012
    3.金属矿山安全技术国家重点实验室,湖南 长沙 410012
    4.湖南省矿山地质灾害防治与环境再造工程技术研究中心,湖南 长沙 410012

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滕龙(1994—),男,湖北恩施人,硕士,工程师,主要研究方向为矿山水害防治理论与技术、地下水数值模拟技术及应用。E-mail:
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