眼前山铁矿深部地应力分布特征及其与地质构造的关系

Distribution Characteristics of Deep Underground Stress and Its Relationship with Geological Structure in Yanqianshan Iron Mine

眼前山铁矿正处于露天转地下时期,地应力环境日趋复杂。基于此,采用应力解除法对矿区3个地点进行了地应力测量,以此为基础建立了地应力场模型,分析地应力分布特征及其与地质构造的关系。研究结果表明,3个测点的水平主应力方向变化较大,但基本保持为近南北向,倾角为3.5°~10.2°,变化相对较小。水平主应力大于垂直主应力,说明该矿区水平构造应力对地应力场影响更大。由地应力场模型可知,地应力各分量与埋深呈线性关系。区域地层总体产状为走向270°~300°,倾向北,倾角70°~85°,地应力分布受其影响较大。

Yanqianshan iron mine is in the transition from open pit to underground,and the ground stress environment is becoming more and more complex.Based on this,the underground stress measurement was carried out in three locations of the mining area by the stress relief method.Based on this,the underground stress field model was established to analyze the distribution characteristics of geostress distribution and the relationship between geostress distribution and geological structure.The results show that the direction of the horizontal principal stress of the three measuring points changed greatly,but kept nearly north-south.The dip angle change with 3.5°to 10.2°was relatively small.The horizontal principal stress is greater than the vertical principal stress,which indicates that the horizontal tectonic stress has a greater influence on the geostress field.From the underground stress field model,it can be know that each component of underground stress has a linear relationship with the buried depth.The general occurrence of the regional strata is 270°to 300°,dipping to the north and 70°to 85°,which greatly affects the underground stress distribution.