汤丹铜矿深部三维地应力分布规律及矿区结构面特征
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摘要
汤丹铜矿1 218m中段探矿工程出现地应力集中现象,巷道大变形、岩层移动加剧。为采空区稳定性数值模拟提供原岩应力场,采用单孔3段套孔应力解除法对3个中段进行三维地应力测试,获取了垂直方向9组地应力数据,将解除的试件进行围压率定试验,判定12个应力片的工作状态。三维地应力测量结果表明:最大主应力、中间主应力和最小主应力随深度基本呈线性增长;当深度达1 130m时,最大主应力值为41.29MPa,与水平面夹角为-1.15°,方位角179.37°,水平主应力与自重应力比值为1.35～1.47,反映出矿区存在较大的构造应力场。将测量结果与区域构造和结构面产状结合分析发现,主应力方向与断层和结构面走向一致,与巷道工程布置垂直或大角度斜交,研究成果对深部回采和井巷工程布置具有重大意义。
The geostress concentration phenomenon occurs in the 1 218 m middle section of the Tangdan Copper Mine.The deformation of the roadway becomes large and the movement of the rock stratum are intensified.The original rock stress field is provided for numerical simulation of goaf stability.3 Dground stress test is carried out on three middle sections by single hole 3-segment hole stress relief method.The vertical 9 sets of ground stress data are obtained,and the released test pieces are carried out.The confining pressure test was conducted to determine the working state of the 12 stress plates.Test results of 3 Din-situ stress measurement show that the maximum principal stress,intermediate principal stress,and the minimum principal stress increase linearly with the depth.When the depth reaches 1 130 m,the maximum principal stress is 41.29 MPa and the angle with horizontal plane and azimuth are-1.15°and 179.37°,respectively.The ratio of horizontal principal stress to gravity stress is 1.35～1.47,indicating the existence of a large tectonic stress field in the mining area.Combining the measurement results with the regional structure and structural plane occurrence,it is found that the direction of principal stress is consistent with the fault and structural plane,and perpendicular or oblique to the roadway engineering layout at a large angle.The research results are of great significance for deep mining and roadway engineering design.
The geostress concentration phenomenon occurs in the 1 218 m middle section of the Tangdan Copper Mine.The deformation of the roadway becomes large and the movement of the rock stratum are intensified.The original rock stress field is provided for numerical simulation of goaf stability.3 Dground stress test is carried out on three middle sections by single hole 3-segment hole stress relief method.The vertical 9 sets of ground stress data are obtained,and the released test pieces are carried out.The confining pressure test was conducted to determine the working state of the 12 stress plates.Test results of 3 Din-situ stress measurement show that the maximum principal stress,intermediate principal stress,and the minimum principal stress increase linearly with the depth.When the depth reaches 1 130 m,the maximum principal stress is 41.29 MPa and the angle with horizontal plane and azimuth are-1.15°and 179.37°,respectively.The ratio of horizontal principal stress to gravity stress is 1.35～1.47,indicating the existence of a large tectonic stress field in the mining area.Combining the measurement results with the regional structure and structural plane occurrence,it is found that the direction of principal stress is consistent with the fault and structural plane,and perpendicular or oblique to the roadway engineering layout at a large angle.The research results are of great significance for deep mining and roadway engineering design.
引文
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[2]钱七虎.非线形岩石力学的新进展―深部岩体力学的若干关键问题[C]∥第八次全国岩石力学与工程学术会议论文集.北京:科学出版社,2004:10-17.QIAN Qihu.The Current Development of Nonlinear Rock Mechanics:The Mechanics Problems of Deep Rock Mass[C]∥Proceedings of the 8th National Conference on Rock Mechanics and Engineering.Beijing:Science Press,2004:10-17.
[3]刘业科,曹平,衣永亮,等.基于地下深部工程岩体特性的RMR系统修正[J].中南大学学报(自然科学版),2010,41(4):1497-1505.LIU Yeke,CAO Ping,YI Yongliang,et al.Revised RMRSystem on Underground Deep Engineering Rock Mass Property[J].Journal of Central South University(Science and Technology),2010,41(4):1497-1505.
[4]李新平,汪斌,周桂龙.我国大陆实测深部地应力分布规律研究[J].岩石力学与工程学报,2012,31(1):2875-2880.LI Xinping,WANG Bin,ZHOU Guilong.Research on Distribution Rule of Geostress in Deep Stratum in Chinese Mainland[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(1):2875-2880.
[5]赵德安,陈志敏,蔡小林,等.中国地应力场分布规律统计分析[J].岩石力学与工程学报,2007,26(6):1265-1271.ZHAO Dean,CHEN Zhimin,CAI Xiaolin,et al.Analysis of Distribution Bule of Geostress in Chinese[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(6):1265-1271.
[6]谢和平.“深部岩体力学与开采理论”研究构想与预期成果展望[J].工程科学与技术,2017,49(2):1-16.XIE Heping.Research Framework and Anticipated Results of Deep Rock Mechanics and Mining Theory[J].Advanced Engineering Sciences,2017,49(2):1-16.
[7]谢和平,高峰,鞠杨.深部岩体力学研究与探索[J].岩石力学与工程学报,2015,34(11):2161-2178.XIE Heping,GAO Feng,JU Yang.Research and Development of Rock Mechanics in Deep Ground Engineering[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(11):2161-2178.
[8]张重远,吴满路,廖椿庭.金川三矿地应力测量及应力状态特征研究[J].岩土力学,2013,34(11):3254-3260.ZHANG Chongyuan,WU Manlu,LIAO Chunting.Insitu Stress Measurement and Study of Stress State Characteristics of Jinchuan No.3mine[J].Rock and Soil Mechanics,2013,34(11):3254-3260.
[9]曹辉,郭利杰,解联库,等.六苴铜矿深部岩体地应力特征分析与研究[J].有色金属(矿山部分),2013,65(3):75-78.CAO Hui,GUO Lijie,XIE Lianku,et al.Analysis and Study on The In-situ Stress of Deep Rock Mass in Liuju Copper Mine[J].Nonferrous Metals(Mining Section),2013,65(3):75-78.
[10]于跟波,杨鹏,陈赞成,等.狮子山铜矿深部开采三维地应力实测及应力场分布研究[J].有色金属(矿山部分),2013,65(4):48-52.YU Genbo,YANG Peng,CHEN Zancheng,et al.Study on 3DIn-situ Stress Measurement and Distribution of Stress Fields in Deep Mining of Shizishan Copper Mine[J].Nonferrous Metals(Mining Section),2013,65(4):48-52.
[11]蔡美峰,刘卫东,李远.玲珑金矿深部地应力测量及矿区地应力场分布规律[J].岩石力学与工程学报,2010,29(2):227-233.CAI Meifeng,LIU Weidong,LI Yuan.In-situ Stress Measurement at Deep Position of Linglong Gold Mine and Distribution Law of In-situ Stress Field in Mine Area[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(2):227-233.
[12]刘卫明,刘继顺,尹利君,等.东川运动及其对东川矿区褶皱构造的影响[J].地质力学学报,2012,18(1):42-51.LIU Weiming,LIU Jishun,YIN Lijun,et al.Dongchuan Movement and Its Influence on Folding Structures in Dongchuan Mining District[J].Journal of Geomechanics,2012,18(1):42-51.
[13]陈枫,饶秋华,徐纪成,等.应变解除法远离及其在大红山铁矿地应力测量中的应用[J].中南大学学报(自然科学版),2007,38(3):545-550.CHEN Feng,Rao Qiuhua,XU Jicheng,et al.Principle of Strain Release Method and Its Application to The Insitu Stress Measurement in Dahongshan Iron Mine[J].Joural of Central South University.(Science and Technology),2007,38(3):545-550.