大红山铁矿三维地应力场的测量及分布规律研究
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摘要
云南大红山铁矿属于国内埋藏较深的大型地下金属矿山之一,矿区位于多种复杂区域构造的结合部位,地质构造非常复杂,具备了发生岩爆灾害的潜在条件。采用瑞典LUT地应力测定系统对该矿区中深部的4个不同中段的6个测点进行了现场地应力测量,并对其变化规律及分布特征进行了分析。测量结果表明:矿区的最大主应力值随着深度基本呈线性增大,最大达到47 MPa,方位角介于北偏东16°~65°之间,平均倾向为北40.84°东;平均倾角约14.35°,最小倾角仅2.89°,说明该矿区水平构造应力明显,这与该区域的地质构造相吻合。
Dahongshan Iron Mine in Yunnan is one of the large deep-laying underground metal mines in China.The deposit is situated at a joint of various types of complex regional structures,with a very complex geological structure and the potential conditions for rockburst hazard occurrence.In-situ stress measurement is carried out via six points located at 4 different sublevels by means of LUT Sweden in-situ stress measuring system,and its variation law and distribution characteristics are also studied.The results show that the maximum principle stress increases linearly with the depth increase,reaching about 47 MPa at maximum,with its azimuth angle ranging from N16°E to N 65°E,the average azimuth angle being around N 40.84°E,and the average inclination angle being 14.35°,only 2.89°at minimum,indicting that the horizontal tectonic stress is prominent here,which is very agreeable to the regularity of geological structure in this region.
Dahongshan Iron Mine in Yunnan is one of the large deep-laying underground metal mines in China.The deposit is situated at a joint of various types of complex regional structures,with a very complex geological structure and the potential conditions for rockburst hazard occurrence.In-situ stress measurement is carried out via six points located at 4 different sublevels by means of LUT Sweden in-situ stress measuring system,and its variation law and distribution characteristics are also studied.The results show that the maximum principle stress increases linearly with the depth increase,reaching about 47 MPa at maximum,with its azimuth angle ranging from N16°E to N 65°E,the average azimuth angle being around N 40.84°E,and the average inclination angle being 14.35°,only 2.89°at minimum,indicting that the horizontal tectonic stress is prominent here,which is very agreeable to the regularity of geological structure in this region.
引文
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[3]刘允芳,龚壁新,罗超文,等.岩体地应力与工程建设[M].武汉:湖北科学技术出版社,2000.
[4]李军财.深部边坡岩体应力解除地应力测量与分析[J].金属矿山,2004(7):16-18.
[5]解世俊.金属矿床深部开采的几个技术问题[J].金属矿山1998(06):3-6.
[6]吴满路,廖椿庭,张春山,等.红透山铜矿地应力测量及其分布规律研究[J].岩石力学与工程学报,2004,23(23):3943-3947.
[7]蔡美峰,乔兰,余波,等.金川二矿区深部地应力测量及其分布规律研究[J].岩石力学与工程学报,1999,18(4):414-418.
[8]Amadei B,Stephansson O.Rock Stress and Its Measurement[M].NewYork:Chapman and Hall,1997.
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