Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Field monitoring of splitting failure for surrounding rock masses and applications of energy dissipation model

  • Wang, Zhi-shen (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Li, Yong (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Zhu, Wei-shen (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Xue, Yi-guo (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Jiang, Bei (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Sun, Yan-bo (Shandong Luqiao Group CO. LTD.)
  • Received : 2015.10.10
  • Accepted : 2016.12.02
  • Published : 2017.04.25
⟨ Previous Next ⟩

Abstract

Due to high in-situ stress and brittleness of rock mass, the surrounding rock masses of underground caverns are prone to appear splitting failure. In this paper, a kind of loading-unloading variable elastic modulus model has been initially proposed and developed based on energy dissipation principle, and the stress state of elements has been determined by a splitting failure criterion. Then the underground caverns of Dagangshan hydropower station is analyzed using the above model. For comparing with the monitoring results, the entire process of rock splitting failure has been achieved through monitoring the splitting failure on side walls of large-scale caverns in Dagangshan via borehole TV, micro-meter and deformation resistivity instrument. It shows that the maximum depth of splitting area in the downstream sidewall of the main power house is approximately 14 m, which is close to the numerical results, about 12.5 m based on the energy dissipation model. As monitoring result, the calculation indicates that the key point displacement of caverns decreases firstly with the distance from main powerhouse downstream side wall rising, and then increases, because this area gets close to the side wall of main transformer house and another smaller splitting zone formed here. Therefore it is concluded that the energy dissipation model can preferably present deformation and fracture zones in engineering, and be very useful for similar projects.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Shandong University, Shandong Provincial Natural Science Foundation

References

  1. Chatterjee, K., Choudhury, D., Rao, V.D. and Mukherjee, S.P. (2015), "Dynamic analyses and field observations on piles in kolkata city", Geomach. Eng., Int. J., 8(3), 415-440. https://doi.org/10.12989/gae.2015.8.3.415
  2. Hibino, S. and Motojma, M. (1995), "Characteristic behavior of rock mass during excavation of large caverns", Proceedings of the 8th International Congress on Rock Mechanics, Tokyo, Japan, September.
  3. Jia, S.P., Chen, W.Z., Tan, X.J. and Lv, S.P. (2008), "Nelder-Mead algorithm for inversion analysis of insitu stress field of underground powerhouse area of Dagangshan Hydropower Station", Rock Soil Mech., 29(9), 2341-2349.
  4. Li, X.J. (2007), "Experimental and theoretical studies of formation mechanism of splitting failure of the deep cavern", Ph.D. Dissertation; Shandong University, Shandong, China.
  5. Li, Y. (2009), "Study on the stability induced by stepped excavations and rheological effect of underground cavern groups in high in-situ stress areas", Ph.D. Dissertation; Shandong University, Shandong, China.
  6. Li, X.J., Zhu, W.S., Li, S.C. and Yang, W.M. (2011), "A new displacement prediction method of brittle jointed rock mass considering excavation unloading splitting effect", Chin. J. Rock Mech. Eng., 30(7), 1445-1453.
  7. Li, Y., Zhu, W.S., Fu, J.W., Guo, Y.H. and Qi, Y.P. (2014), "A damage rheology model applied to analysis of splitting failure in underground caverns of Jinping I hydropower station", Int. J. Rock Mech. Min. Sci., 71, 224-234.
  8. Li, Y., Guo, Y.H., Zhu, W.S., Li, S.C. and Zhou, H. (2015a), "A modified initial in-situ stress inversion method based on FLAC3D with an engineering application", Open Geosci., 7(1), 824-835.
  9. Li, Y., Wang, H.P., Zhu, W.S., Li, S.C. and Liu, J. (2015b), "Structural stability monitoring of a physical model test on an underground cavern group during deep excavations using FBG sensors", Sensors, 15(9), 21696-21709. https://doi.org/10.3390/s150921696
  10. Li, Y., Zhou, H., Zhu, W.S., Li, S.C. and Liu, J. (2015c), "Numerical study on crack propagation in brittle jointed rock mass influenced by fracture water pressure", Materials, 8(6), 3364-3376. https://doi.org/10.3390/ma8063364
  11. Li, Y., Zhou, H., Zhu, W.S., Li, S.C. and Liu, J. (2015d), "Numerical investigations on slope stability using an elasto-brittle model considering fissure water pressure", Arab. J. Geosci., 8(12), 10277-10288. https://doi.org/10.1007/s12517-015-1967-4
  12. Li, Y., Zhou, H., Zhu, W.S., Li, S.C. and Liu, J. (2016a), "Experimental and numerical investigations on the shear behavior of a jointed rock mass", Geosci. J., 20(3), 371-379. https://doi.org/10.1007/s12303-015-0052-z
  13. Li, Y., Zhou, H., Zhang, L., Zhu, W.S., Li, S.C. and Liu, J. (2016b), "Experimental and numerical investigations on mechanical property and reinforcement effect of bolted jointed rock mass", Constr. Build. Mater., 126, 843-856. https://doi.org/10.1016/j.conbuildmat.2016.09.100
  14. Liu, N. (2009), "Study on mechanical mechanism and energy analysis model of splitting failure in high geostress", Ph.D. Dissertation; Shandong University, Shandong, China.
  15. Liu, H.B. and Xiao, M. (2010), "Stability assessment of surrounding rock of underground cavern complexes based on energy-dissipation model", Asia-Pacific Pow. Energy Eng. Conference, APPEEC, Chengdu, China, March.
  16. Ma, H.L., Yang, C.H., Li, Y.P., Shi, X.L., Liu, J.F. and Wang, T.T. (2015), "Stability evaluation of the underground gas storage in rock salts based on new partitions of the surrounding rock", Environ. Earth Sci., 73(11), 6911-6925. https://doi.org/10.1007/s12665-015-4019-1
  17. Tang, J.F., Xu, G.Y. and Tang, X.M. (2009), "Cause analysis of longitudinal cracks of rock-anchored beam and its developmental trend in underground powerhouses", Chin. J. Rock Mech. Eng., 28(5), 1000-1009.
  18. Wang, J., Zhu, W.S., Li, S.C., Yang, W.M. and Yu, D.J. (2012), "Study on model test and REV of jointed rock mass and engineering application", Energy Educ. Sct. Technol. Part A. Energy Sci. Res., 30(SPEC. ISS.1), 1167-1174.
  19. Wang, J., Li, S.C., Li, L.P., Zhu, W.S., Zhang, Q.Q. and Song, S.G. (2014), "Study on anchorage effect on fractured rock", Steel Compos. Struct., Int. j., 17(6), 791-801. https://doi.org/10.12989/scs.2014.17.6.791
  20. Wang, H.P., Li, Y., Li, S.C., Zhang, Q.S. and Liu, J. (2016a), "An elasto-plastic damage constitutive model for jointed rock mass with an application", Geomech. Eng., Int. J., 11(1), 77-94. https://doi.org/10.12989/gae.2016.11.1.077
  21. Wang, Z.S., Li, Y., Zhu, W.S., Xue, Y.G. and Yu, S. (2016b), "Splitting failure in side walls of a large-scale underground cavern group: A numerical modelling and a field study", Springerplus, 5(1), 1528. https://doi.org/10.1186/s40064-016-3214-1
  22. Yu, S., Zhu, W.S., Yang, W.M., Zhang, D.F. and Ma, Q.S. (2015), "Rock bridge fracture model and stability analysis of surrounding rock in underground cavern group", Struct. Eng. Mech., 53(3), 481-495. https://doi.org/10.12989/sem.2015.53.3.481
  23. Zhang, J.G., Zhang, Q.Y., Yang, W.D. and Zhang, X. (2009), "Regression analysis of initial geostress field in dam zone of Dagangshan hydropower station", Rock Soil Mech., 30(10), 3071-3078.
  24. Zhang, H.Y., Wei, Q., Sheng, Q., Leng, X.L. and Jing, F. (2011), "Three dimensional back analysis of geostress field in underground powerhouse zone of Dagangshan hydropower station", Rock Soil Mech., 32(5), 1523-1530.
  25. Zheng, W.H. (2010), "The study on opening displacement of brittle rockmass in high geostress", M.S. Dissertation; Shandong University, Shandong, China.
  26. Zheng, W.H., Zhu, W.S. and Liu, D.J. (2012), "Simulation of opening displacement of brittle rockmass at point of energy dissipation", Rock Soil Mech., 33(11), 3503-3508.
  27. Zhou, X.P., Zhang, Y.X., Ha, Q.L. and Zhu, K.S. (2008), "Micromechanical modelling of the complete stress-strain relationship for crack weakened rock subjected to compressive loading", Rock Mech. Rock Eng., 41(5), 747-769. https://doi.org/10.1007/s00603-007-0130-2
  28. Zhou, X.P., Xia, E.M., Yang, H.Q. and Qian, Q.H. (2012), "Different crack sizes analyzed for surrounding rock mass around underground caverns in Jinping I hydropower station", Theor. Appl. Fract. Mech., 57(1), 19-30. https://doi.org/10.1016/j.tafmec.2011.12.004
  29. Zhu, W.S., Li, Y., Li, S.C., Wang, S.G. and Zhang, Q.B. (2011a), "Quasi-three-dimensional physical model tests on a cavern complex under high in-situ stresses", Int. J. Rock Mech. Min. Sci., 48(2), 199-209. https://doi.org/10.1016/j.ijrmms.2010.11.008
  30. Zhu, W.S., Yang, W.M., Xiang, L., Li, X.J. and Zheng, W.H. (2011b), "Laboratory and field study of splitting failure on side wall of large-scale cavern and feedback analysis", Chin. J. Rock Mech. Eng., 30(7), 1310-1317.
  31. Zhu, W.S., Yang, W.M., Li, X.J., Xiang, L. and Yu, D.J. (2014), "Study on splitting failure in rock masses by simulation test, site monitoring and energy model", Tunn. Undergr. Space Technol., 41(1), 152-164. https://doi.org/10.1016/j.tust.2013.12.007

Cited by

  1. Rock fracturing mechanisms around underground openings vol.16, pp.1, 2018, https://doi.org/10.12989/gae.2018.16.1.035
  2. Effects of water saturation time on energy dissipation and burst propensity of coal specimens vol.24, pp.3, 2017, https://doi.org/10.12989/gae.2021.24.3.205