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Three-dimensional discrete element method simulation of core disking

Autorzy
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The phenomenon of core disking is commonly seen in deep drilling of highly stressed regions in the Earth’s crust. Given its close relationship with the in situ stress state, the presence and features of core disking can be used to interpret the stresses when traditional in situ stress measuring techniques are not available. The core disking process was simulated in this paper using the three-dimensional discrete element method software PFC3D (particle flow code). In particular, PFC3D is used to examine the evolution of fracture initiation, propagation and coalescence associated with core disking under various stress states. In this paper, four unresolved problems concerning core disking are investigated with a series of numerical simulations. These simulations also provide some verification of existing results by other researchers: (1) Core disking occurs when the maximum principal stress is about 6.5 times the tensile strength. (2) For most stress situations, core disking occurs from the outer surface, except for the thrust faulting stress regime, where the fractures were found to initiate from the inner part. (3) The anisotropy of the two horizontal principal stresses has an effect on the core disking morphology. (4) The thickness of core disk has a positive relationship with radial stress and a negative relationship with axial stresses.
Czasopismo
Rocznik
Strony
267--282
Opis fizyczny
Bibliogr. 41 poz.
Twórcy
autor
  • University of Science and Technology Beijing Beijing China
  • Key Laboratory of Ministry for Efficient Mining and Safety of Metal MinesUniversity of Science and Technology Beijing Beijing China
  • Kunming University of Science and Technology Kunming China
autor
  • University of Science and Technology Beijing Beijing China, wuhaoyan@live.cn
  • Key Laboratory of Ministry for Efficient Mining and Safety of Metal MinesUniversity of Science and Technology Beijing Beijing China
autor
  • University of ArizonaTucsonUSA
Bibliografia
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  • 2. Bankwitz PBE (1997) Fractographic features on joints in KTB drill cores as indicators of the contemporary stress orientation. Geol Rundsch 86:34–44
  • 3. Chenghu W (2014) Brief review and outlook of main estimate and measurement methods for in situ stresses in rock mass. Geol Rev 60(5):971–995
  • 4. Corthésy R, Leite MH (2008) A strain-softening numerical model of core discing and damage. Int J Rock Mech Min Sci 45:329–350. https://doi.org/10.1016/j.ijrmms.2007.05.005
  • 5. Crawford BR, Smart BGD, Main IG, Liakopoulou-Morris F (1995) Strength characteristics and shear acoustic anisotropy of rock core subjected to true triaxial compression. Int J Rock Mech Min Sci 32:189–200. https://doi.org/10.1016/0148-9062(94)00051-4
  • 6. Cundall PA, Strack ODL (1979) A discrete numerical model for granular assemblies. Ge´otechnique 29:47–65. http://dx.doi.org/10.1680/geot.1979.29.1.47
  • 7. Dyke CG (1989) Core discing: its potential as an indicator of principal in situ stress directions. Rock Gt. Depth 2:1057–1064
  • 8. Flottmann T, Campagna DJ, Hillis R, Warner D (2004) Horizontal microfractures and core discing in sandstone reservoirs, Coopers Basin, Australia. PESA’s East Aust Basins Symp 2:689–694
  • 9. Hast N (1958) The measurement of rock pressure in mines. Norstedt, Stockholm
  • 10. Hast N (1979) Limits of stress measurements in the earth’s crust. Rock Mech 150:143–150
  • 11. Holt RM, Brignoli M, Kenter CJ (2000) Core quality: quantification of coring-induced rock alteration. Int J Rock Mech Min Sci 37:889–907. https://doi.org/10.1016/S1365-1609(00)00009-5
  • 12. Holt RM, Pestman BJ, Kenter CJ (2001) Use of a discrete particle model to assess feasibility of core based stress determination. In: Rock mechanics in the national interest, pp 1361–1366
  • 13. Hongwei Z, Hai R, Jun H et al (2014) Study on rock core discing mechanism based on stress and energy principle. Chin J Appl Mech 31(4):512–517
  • 14. Hou F, Jia Y (1984) Stress analysis on disced rock cores. Chin J Geotech Eng 6(5):48–58
  • 15. Huang H, Fan P, Li J et al (2016) A theoretical explanation for rock core disking in triaxial unloading test by considering local tensile stress. Acta Geophys 64:1430–1445. https://doi.org/10.1515/acgeo-2016-0068
  • 16. Ishida T, Saito T (1989) A study on core discing with a center hole. Shigen-to-Sozai 105:603–608. https://doi.org/10.2473/shigentosozai.105.603
  • 17. Ishida T, Saito T (1995) Observation of core discing and in situ stress measurements; Stress criteria causing core discing. Rock Mech Rock Eng 28:167–182. https://doi.org/10.1007/BF01020150
  • 18. Itasca Consulting Group I (2015) PFC—particle flow code in 2 and 3 dimensions, Version 5.0
  • 19. Jaeger JC, Coox NGW (1963) Pinching-off and disking of rocks. J Geophys Res 68(6):1759–1765
  • 20. Katsuhiko S et al (1978) A study on core discing of rock. J Min Met Inst Jpn 94:797–803
  • 21. Kaga N, Matsuki K, Sakaguchi K (2003) The in situ stress states associated with core discing estimated by analysis of principal tensile stress. Int J Rock Mech Min Sci 40:653–665. https://doi.org/10.1016/S1365-1609(03)00057-1
  • 22. Kulander BR, Dean SL, Ward BJ (1990) Fractured core analysis-induced fractures in core. American Association of Petroleum Geologists
  • 23. Li Y (1997) Drilling induced core damage and their relationship to crustal in situ stress states and rock properties. University of Alberta, Edmonton
  • 24. Li Y, Schmitt DR (1997a) Effects of poisson’s ratio and core stub length on bottomhole stress concentrations. Int J Rock Mech Min Sci 34:761–773. https://doi.org/10.1016/S1365-1609(97)00001-6
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  • 26. Li Y, Schmitt DR (1998) Drilling-induced core fractures and in situ stress. J Geophys Res 103:5225–5239
  • 27. Lim SS (2013) In-situ stress magnitude and core disking. University of Albert, Edmonton
  • 28. Lim SS, Martin CD (2010) Core disking and its relationship with stress magnitude for Lac du Bonnet granite. Int J Rock Mech Min Sci 47:254–264. https://doi.org/10.1016/j.ijrmms.2009.11.007
  • 29. Matsuki K, Hongo K, Sakaguchi K (1997a) A tensile principal stress analysis for estimating three-dimensional in situ stressed from core discing. In: Rock stress, Rotterdam, Balkema, pp 343–348
  • 30. Matsuki K, Hongo K, Sakaguchi K (1997b) A tensile principal stress analysis for estimating three-dimensional in situ stresses from core discing. In: Rock Stress, Rotterdam, Balkema, pp 343–348
  • 31. Matsuki K, Kaga N, Yokoyama T, Tsuda N (2003) Determination of three-dimensional directions of in situ stress from core discing. In: Rock stress: proceedings of the third internaional symposium on rock stress, pp 237–243
  • 32. Matsuki K, Kaga N, Yokoyama T, Tsuda N (2004) Determination of three dimensional in situ stress from core discing based on analysis of principal tensile stress. Int J Rock Mech Min Sci 41:1167–1190. https://doi.org/10.1016/j.ijrmms.2004.05.002
  • 33. McGarr A, Gay NC (1978) State of stress in the earth’s crust. Annu Rev Earth Planet Sci 6:405–436. https://doi.org/10.1146/annurev.ea.06.050178.002201
  • 34. Obara Y, Kang SS, Seguchi T, Sato A (1998) a criterion of hollow core disking initiation. Shigen to Sozai 114:875–880
  • 35. Obert L, Stephenson DE (1965) Stress conditions under which core discing occurs. Soc Min Eng AIME Trans 232:227–235
  • 36. Shang Y, Sun Q (1991) Rock core disking mechanism analysis of TianHuangCheng power station
  • 37. Stacey TR (1982) Contribution to the mechanism of core discing. J S Afr Inst Min Metall 82:269–276
  • 38. Takehiro O (2001) Core disking and Rockburst in soft tuffaceous rock masses at Iwate tunnel tuffaceous. QR RTRI 42:130–135
  • 39. Tianhui M, Long W, Tao X, Qun YU (2016) Mechanism and stress analysis of rock core discing. J Northeastern Univ 37(10):1491–1495
  • 40. Vallejos JA, Salinas JM, Delonca A, Mas Ivars D (2016) Calibration and verification of two bonded-particle models for simulation of intact rock behavior. Int J Geomech 17:6016030. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000773
  • 41. Zhu W, Li G, Wang K (1985) Analyses of disking phenomenon and stress field in the region of an underground powerhouse. Rock Mech Rock Eng 18:1–15. https://doi.org/10.1007/BF01020412
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-49517a8e-e6a2-4154-9abe-2c4c92d080fe
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