Analysis and application of in-situ stress in metal mining area of Chinese mainland
-
摘要: 以迄今為止查閱到的中國大陸金屬礦區實測地應力數據為基礎，經優化處理后最終采用165組數據，基本覆蓋了我國大陸主要金屬礦山分布地區.采用回歸分析法給出了中國大陸金屬礦區測量埋深范圍內的地應力場特征，并嘗試從地應力的角度對中國大陸金屬礦區斷層的穩定性進行了討論.結果顯示，中國大陸金屬礦區垂直主應力、最大與最小水平主應力總體上隨埋深呈線性增加；最大與最小水平主應力之差Δσ隨埋深的增加有增大的趨勢，但規律性不顯著；最大水平主應力與垂直主應力之比Kh，max主要集中在1.00~2.50之間，最小水平主應力與垂直主應力之比Kh，min主要集中在0.50~1.50之間，平均水平主應力與垂直主應力之比Kh，av主要集中在1.00~2.00之間，隨著埋深的增加，3個側壓系數的變化幅度逐漸減小，Kh，max趨向于1.83，Kh，min趨向于0.80，Kh，av趨向于1.31；最大與最小水平主應力之比與埋深沒有顯著的關系，主要集中在1.5~2.0之間，近似服從正態分布；斷層在埋深小于500 m范圍內有滑動的可能，埋深超過500 m時，逆斷層有滑動的可能，走滑斷層處于相對穩定狀態.Abstract: Based on the measured in-situ stress data of the metal mining area in China, 165 sets of data were finally adopted after optimized treatment, which basically covers the distribution area of the main metal mines in the Chinese mainland. The characteristics of in-situ stress field in the buried depth of the metal mining area in China were presented by regression analysis method, and the stability of the fault of the metal mining area in China was discussed from the ground stress. The results show that the vertical principal stress, the maximum horizontal principal stress and the minimum horizontal principal stress in the metal mining area of Chinese mainland generally increase linearly with the depth. The difference between maximum and minimum horizontal principal stresses (Δσ) increases with the depth, but the regularity is not significant. The ratio of maximum horizontal principal stress to vertical principal stress (Kh,max), the ratio of minimum horizontal principal stress to vertical principal stress (Kh,min) and the ratio of average horizontal stress to vertical principal stress (Kh,av) mainly concentrate in the interval of 1. 00 to 2. 50, 0. 50 to 1. 50, and 1. 00 to 2. 00, respectively. With the increase of depth, the variation amplitudes of the three lateral pressure coefficients decrease gradually:Kh,max, Kh,min and K h,av tend to 1. 83, 0. 80 and 1. 31, respectively. The ratio of maximum horizontal principal stress to minimum horizontal principal stress has no obvious regularity with the depth, and the values mainly concentrate from 1. 5 to 2. 0, approximate to normal distribution. Metal mining area has the possibility of fault slip when the depth is less than 500 m, and the reverse fault has the possibility of sliding while the strike slip fault is in a relatively stable state when the depth is more than 500 m.
-
參考文獻
[2] Cai M F, Qiao L, Li C H, et al. Results of in situ stress measurement and their application to mining design at five Chinese metal mines. Int J Rock Mech Min Sci, 2000, 37(3):509 [5] Hast N. The state of stress in the upper part of the earth's crust. Tectonophysics, 1969, 8(3):169 [6] Worotniki G, Denham D. The state stress in the upper part of the Earth's crust in Australia according to measurements in mines and tunnels and from seismic observation//Symposium on Investigation of Stress in Rock:Advances in Rock Measurment. Sydney, 1976:71 [7] Brown E T, Hoek E. Trends in relationships between measured in-situ stress and depth. Int J Rock Mech Min Sci Geomech Abstr, 1978, 15:211 [8] Hoek E, Brown E T. Underground Excavations in Rock. London:Institution of Mining and Metallurgy, 1980 [9] Zoback M L. First- and second-order patterns of stress in the lithosphere:the world stress map project. J Geophys Res Solid Earth B, 1992, 97(8):11703 [14] Sibson R H. Frictional constraints on thrust, wrench, and normal faults. Nature, 1974, 249:542 [15] Yin Z M, Ranalli G. Critical stress difference, fault orientation and slip direction in anisotropic rocks under non-Andersonian stress systems. J Struct Geol, 1992, 14(2):237 [30] Gay N C. In-situ stress measurements in Southern Africa. Tectonophysics, 1975, 29(1):447 [34] Zoback M D, Tsukahara H, Hickman S. Stress measurements at depth in the vicinity of the San Andreas Fault:implications for the magnitude of shear stress at depth. J Geophys Res, 1980, 85(B11):6157 [35] Byerlee J D. Friction of rocks. Pure Appl Geophys, 1978, 116(4):615 [37] Zoback M D, Townend J. Implications of the hydrostatic pore pressures and high crustal strength for the deformation of intraplate lithosphere. Tectonophysics, 2001, 336(1):19 [38] Zoback M D. Reservoir Geomechanics. Cambridge:Cambridge University Press, 2007 [39] Verberne B A, He C R, Spiers C J. Frictional properties of sedimentary rocks and natural fault gouge from the Longmen Shan Fault Zone, Sichuan, China. Bull Seismol Soc Am, 2010, 100(58):2767 -
點擊查看大圖
計量
- 文章訪問數: 703
- HTML全文瀏覽量: 222
- PDF下載量: 14
- 被引次數: 0
下載:
