基于Mathews稳定图等方法的多角度采空区群稳定性分析评价
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摘要
红岭铅锌矿3中段以上矿房全部采空,遗留大量采空区,危险性非常高,为保证后续回采活动的安全,必须进行采空区群的稳定性分析。首先利用先进数字摄影测量技术,大规模获取岩体结构面参数,从工程岩体地质角度(BQ,RMR)进行岩体稳定性的初步评价;其次建立结构面三维离散裂隙网络模型,从三维数值模拟角度研究围岩的切割破碎程度;再者应用Mathews稳定图方法,从工程经验角度进行上盘围岩稳定性的研究。研究将常规地质方法、数值模拟和工程经验方法相结合,层层递进,多角度准确、全面地获得了复杂采空区群的稳定性分析结果,以及不同岩性围岩所对应的稳定和破坏区域,研究结果对于指导矿山安全回采具有重要意义。
Stopes at the third mid-piece and above of Hongling Lead-Zinc Mine have been mined out, leaving number of goafs of high risk without management. In order to ensure the safety of subsequent mining activities, stability of the mined-out areas has been analyzed in three steps. First, spatial geometric parameters of the structural planes is gained with the advanced photogrammetry, and the preliminary stability evaluation of rock mass from the point of engineering geologic(BQ, RMR) was conducted. Second, the discrete crack network model of structural surface was built to analyze the degree of crushing in surrounding rock from the point of numerical simulation. Third, the stability of the upper surrounding rock was studied from the point of engineering experience based on Mathews stability method. Combining regular geological method with numerical simulation and engineering experience, the research multi-angle layer-layer progressive, this method obtained the accurate and comprehensive analysis results of continuous mined-out zones stability, as well as the corresponding stability and damage area in surrounding rock with different properties. The research result has significant guidance value to safe mining.
Stopes at the third mid-piece and above of Hongling Lead-Zinc Mine have been mined out, leaving number of goafs of high risk without management. In order to ensure the safety of subsequent mining activities, stability of the mined-out areas has been analyzed in three steps. First, spatial geometric parameters of the structural planes is gained with the advanced photogrammetry, and the preliminary stability evaluation of rock mass from the point of engineering geologic(BQ, RMR) was conducted. Second, the discrete crack network model of structural surface was built to analyze the degree of crushing in surrounding rock from the point of numerical simulation. Third, the stability of the upper surrounding rock was studied from the point of engineering experience based on Mathews stability method. Combining regular geological method with numerical simulation and engineering experience, the research multi-angle layer-layer progressive, this method obtained the accurate and comprehensive analysis results of continuous mined-out zones stability, as well as the corresponding stability and damage area in surrounding rock with different properties. The research result has significant guidance value to safe mining.
引文
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[19]胡修文,胡盛明,卢阳,等.岩体体积节理数的统计方法及其在围岩分级中的应用[J].长江科学院院报,2010,27(6):30-34.HU Xiuwen,HU Shengming,LU Yang,et al.Measurement of volumetric joint count and its application in surrounding rock classification[J].Journal of Yangtze River Scientific Research Institute,2010,27(6):30-34.
[20]马超锋,李晓,成国文,等.工程岩体完整性评价的实用方法研究[J].岩土力学,2010,31(11):3579-3584.MA Chaofeng,LI Xiao,CHENG Guowen,et al.Study of practical approach to assess integrality of engineering rock mass[J].Rock and Soil Mechanics,2010,31(11):3579-3584.
[2]ZHANG Xing,SANDERSON D J.Numerical study of critical behaviour of deformation and permeability of fractured rock masses[J].Marine and Petroleum Geology,1998,15(6):535-548.
[3]WANG Peitao,YANG Tianhong,XU Tao,et al.A model of anisotropic property of seepage and stress for jointed rock mass[J].Journal of Applied Mathematics,2013,19(9):1-19.
[4]WANG Peitao,YANG Tianhong,YU Qinglei,et al.Characterization on jointed rock masses based on PFC2D[J].Front Struct Civ Eng,2013,7(1):32-38.
[5]YANG Tianhong,WANG Peitao,XU Tao,et al.Anisotropic characteristics of fractured rock mass and a case study in Shirengou Metal Mine in China[J].Tunnelling and Underground Space Technology,2015,48(3):129-139.
[6]YANG Tianhong,JIA Peng,SHI Wenhao,et al.Seepage-stress coupled analysis on anisotropic properties of fractured rock mass around roadways[J].Tunneling and Underground Space Technology,2014,43(3):11-19.
[7]WANG S H,NI P.Application of block theory modeling on spatial block topological identification to rock slope stability analysis[J].International Journal of Computational Methods,2014,11(1):390-400.
[8]WANG Shuhong,YANG Yong,WANG Yang,et al.Spatial modeling and quick identification of unstable rock blocks based on a digital photogrammetry[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(Sup 1):3432-3438.
[9]胡高建,杨天鸿,师文豪,等.安家岭煤矿岩体结构数字识别及关键块体确定[J].煤炭学报,2014,39(12):2412-2417.HU Gaojian,YANG Tianhong,SHI Wenhao,et al.Digital recognition and key block identification of rock mass structure in Anjialing coal mine[J].Journal of China Coal Society,2014,39(12):2412-2417.
[10]杨天鸿,于庆磊,陈仕阔,等.范各庄煤矿砂岩岩体结构数字识别及参数表征[J].岩石力学与工程学报,2009,28(12):2482-2488.YANG Tianhong,YU Qinglei,CHEN Shikuo,et al.Rock mass structure digital recognition and hytromechanical parameters characterization of sandstone in Fangezhuang coal mine[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(12):2482-2489.
[11]范留明,李宁.基于数码摄影技术的岩体裂隙测量方法初探[J].岩石力学与工程学报,2005,24(5):792-797.FAN Liuming,LI Ning.Study of rock mass joint measurement based on digital photo-grammetry[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(5):792-797.
[12]MATHEWS K E,HOEK E,WYLLIE D C,et al.Prediction of stable excavations for mining at depths below 1000 m in hard rock[J].CANMET Report DSS Serial No OSQ80-00081,DSS File No 17SQ 23440-0,1981,9020.
[13]POTVIN Y.Empirical open stope design in Canada[D].Vancouver:University of British Columbia,1988.
[14]STEWART S B V,FORSYTH W W.The Mathews method for open stope design[J].CIM Bulletin,1995,88(1):45-53.
[15]BROWN E T.Block caving geomechanics[M].Australia:Julius Kruttschnitt Mineral Research Centre,2003:3-12.
[16]WANG J,PAKALNIS R,MILNE D,et al.Empirical underground entry type excavation span design modification[C]//Proceedings,53rd Annual Conference,Canadian Geotechnical Society,2000.
[17]TRUEMAN R,MIKULA P,MAWDESLEY C,et al.Experience in Australia with the Mathews method for open stope design[J].CIM Bulletin,2000,93(2):162-167.
[18]MAWDESLEY C.Using logistic regression to investigate and improve an empirical design method[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(Sup 1):756-761.
[19]胡修文,胡盛明,卢阳,等.岩体体积节理数的统计方法及其在围岩分级中的应用[J].长江科学院院报,2010,27(6):30-34.HU Xiuwen,HU Shengming,LU Yang,et al.Measurement of volumetric joint count and its application in surrounding rock classification[J].Journal of Yangtze River Scientific Research Institute,2010,27(6):30-34.
[20]马超锋,李晓,成国文,等.工程岩体完整性评价的实用方法研究[J].岩土力学,2010,31(11):3579-3584.MA Chaofeng,LI Xiao,CHENG Guowen,et al.Study of practical approach to assess integrality of engineering rock mass[J].Rock and Soil Mechanics,2010,31(11):3579-3584.