滥泥坪铜矿三维地应力测量及巷道布置优化研究

随着矿山开采深度的持续增加，深部高地应力作用下矿区的地压灾害发生率逐渐增长。为使矿区能够安全合理地开展生产工作，准确测量区域内的地应力分布情况，并在此基础上进行巷道布置优化研究很有必要。采用套孔应力解除法对滥泥坪深部3个中段进行三维地应力测试，并对三维应力场分布特征进行分析。测量结果表明：滥泥坪矿区应力随深度基本呈线性增长，实测的各中段最大主应力值在28.62~43.10 MPa之间，原岩应力场以水平构造应力为主，总体表现为NNW-SSE向，根据测量结果调整巷道布置方向并建立三维地质模型对巷道稳定性进行分析，研究结果对巷道布置和矿山安全生产具有重要的指导意义。

Three-dimensional In-situ Stress Measurement and Optimization of Roadway Layout in Lanniping Copper Mine

The in-situ stress is the fundamental force causing damage and deformation of underground rock engineering.With the continuous increase of the mining depth，the ground pressure disaster of the mining area has gradually increased under the action of deep high ground stress.A large number of untreated goaf have been formed in the exploration and mining operations of the old and new areas of the Lanniping copper mine. Due to the influence of ground pressure，a number of collapse pits have been formed on the surface.In order to continue the safe and reasonable production work in the mining area，it is necessary to accurately measure the distribution of ground stress in the area and to optimize the layout of the roadway.The three-dimensional in-situ stress test was carried out on the three middle sections of the deep Lanniping copper mine by the stress relief method，9 sets of testing data in vertical direction are obtained.Meanwhile，the confining pressure rate test was carried out on the core sample，and the working state of 12 stress sheets was determined，and the distribution characteristics of the three-dimensional stress field were analyzed.The measurement results show that maximum principal stress，intermediate principal stress and minimum principal stress show an increasing trend with the increases of depth.The maximum principal stress values of the three measuring points in this test result are all high，the minimum value is 2 350 m，which is 28.62 MPa，and the maximum value is 1 900 m，about 43.1 MPa.According to domestic and international experience，the original rock stress field in the Lanniping belongs to the high geostress state.Combined with the layout of the stope and the specific mining method，the corresponding ground pressure testing measures and reasonable support methods should be adopted to ensure the safe mining of the mine.The original rock stress field is dominated by horizontal tectonic stress.The overall performance is NNW-SSW. According to the maximum shear stress theory，when the vertical stress at the top of the roadway and the vertical stress at the sidewall of the roadway are greatly different，the roadway layout should follow the formula of equal-stress axial ratio （i.e.，roadway gang width/roadway gang height = vertical stress at the sidewall of the roadway/vertical stress at the top of roadway），and then the roadway should be most stable.With the measurement results applied to maximum shear stress theory，the roadway layout is optimized，and a three-dimensional geological model is built within which the stability of the roadway is analyzed.Through analysis and comparison，it is found that the stress，displacement characteristics and plastic zone distribution of the surrounding rock in the rearranged roadway are superior to the original roadway.Therefore，the section size and stress distribution of the roadway should be considered to determine the optimal arrangement of the roadway in the actual engineering.The measurement results have important guiding significance for mine support design and safe production.