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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (6): 862-870.doi: 10.11872/j.issn.1005-2518.2019.06.862

• Mining Technology and Mine Management • Previous Articles     Next Articles

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

Yezhen XIE(),Ping CAO,Haoran CHEN   

  1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2019-04-17 Revised:2019-07-28 Online:2019-12-31 Published:2019-12-24

Abstract:

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.

Key words: stress relief method, 3D ground stress measurement, stress distribution characteristics, Lanniping copper mine, drift stability, numerical calculation

CLC Number: 

  • TD263

Fig.1

Structure diagram of hollow inclusion cell"

Table 1

Testing location and borehole parameters of Lanniping copper mine"

钻孔编号钻孔仰角/(°)钻孔方位角/(°)钻孔孔口中心点坐标
XYZ
LNP-2350m-1#322 895 684.27100 558.122 350.00
LNP-2138m-2#33502 895 766.38100 346.732 138.00
LNP-1900m-3#32802 896 018.94100 283.621 900.00

Fig.2

Steps diagram of stress measurement procedure of hollow inclusion"

Fig.3

Stress relief curve during the overcoring of measuring point in 2 350 m segment"

Fig.4

Test curves of confining pressure with average value of strains"

Table 2

Calculation results of elastic parameters of the site in Lanniping mining area"

测点编号内外径比μE
μ1μ2μ3E1E2E3
LNP-2350m-137.65/130.340.230.260.3154 06755 73459 431

LNP-2350m-2

LNP-2350m-3

37.62/130.370.180.240.2057 69853 42356 430
37.69/130.320.210.250.3359 58157 64560 136
参数均值37.65/130.340.2557 127
LNP-2138m-137.56/130.130.210.160.1416 85218 74120 067
LNP-2138m-237.52/130.150.240.210.1961 23769 56564 893
LNP-2138m-337.59/130.170.410.450.4160 30859 86765 217
参数均值37.56/130.150.2648 535
LNP-1900m-137.23/130.310.250.190.2858 33560 14359 078
LNP-1900m-237.25/130.320.240.250.3157 02359 87360 342
LNP-1900m-337.20/130.350.370.250.2758 37760 45561 978
参数均值37.23/130.330.2759 511

Table 3

Original rock stress measurement results of each measuring point"

测点编号埋深/m最大主应力中间主应力最小主应力
大小/MPa方位/(°)倾角/(°)大小/MPa方位/(°)倾角/(°)大小/MPa方位/(°)倾角/(°)
LNP-2350-1#80028.62124.38-3.5821.4328.16-59.9717.73216.43-29.77
LNP-2138-2#1 01236.6165.9910.5828.4324.7076.5323.13257.548.23
LNP-1900-3#1 25043.1161.56-18.9933.62-77.83-55.9427.21241.4127.12

Fig.5

Horizontal section distribution diagram of stress while drilling gateways"

Fig.6

Three-dimensional roadway geological model"

Table 4

Rock mechanics parameters of each stratum in Lanniping mining erea"

参数名称陡山沱(白云岩)落雪一段(白云岩)落雪二段(白云岩)因民三段(白云岩)辉长岩(白云岩)矿体断层
天然重度γ/(kN·m-328.127.928.027.929.128.623.0
岩体抗剪强度c/kPa8751 7121 93617 941 7941 336120
内摩擦角φ/(°)31.9833.1235.1933.2232.927.120.3
泊松比0.210.230.210.220.190.250.39
弹性模量/GPa3.24.75.44.73.83.40.07
抗压强度/MPa13.918.420.316.415.914.73.0
抗拉强度/MPa1.51.61.91.81.71.10.1

Fig.7

Comparison of characteristics of surrounding rock of roadways with different strike"

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