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DOI QR Code

Laboratory experiments on the improvement of rockfill materials with composite grout

  • Wang, Tao (College of Water Conservancy and Hydropower, Hohai University) ;
  • Liu, Sihong (College of Water Conservancy and Hydropower, Hohai University) ;
  • Lu, Yang (College of Water Conservancy and Hydropower, Hohai University)
  • 투고 : 2018.02.26
  • 심사 : 2019.02.19
  • 발행 : 2019.02.28

초록

Dam deformation should be strictly controlled for the construction of 300 m-high rockfill dams, so the rockfill materials need to have low porosity. A method of using composite grout is proposed to reduce the porosity of rockfill materials for the construction of high rockfill dams. The composite grout is a mixture of fly ash, cement and sand with the properties of easy flow and post-hardening. During the process of rolling compaction, the grout admixture sprinkled on the rockfill surface will gradually infiltrate into the inter-granular voids of rockfill by the exciting force of vibratory roller to reduce the porosity of rockfill. A visible flowing test was firstly designed to explore the flow characteristics of composite grout in porous media. Then, the compressibility, shear strength, permeability and suffusion susceptibility properties of composite grout-modified rockfill are studied by a series of laboratory tests. Experimental results show that the flow characteristics of composite grout are closely related to the fly ash content, the water-to-binder ratio, the maximum sand size and the content of composite grout. The filling of composite grout can effectively reduce the porosity of rockfill materials, as well as increase the compression modulus of rockfill materials, especially for loose and gap-graded rockfill materials. Composite grout-modified rockfill tends to have greater shear strength, larger suffusion erosion resistance, and smaller permeability coefficient. The composite grout mainly plays the roles of filling, lubrication and cementation in rockfill materials.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China, Priority Academic Program Development(PAPD)

참고문헌

  1. Alonso, E.E. and Cardoso, R. (2010), "Behavior of materials for earth and rockfill dams: Perspective from unsaturated soil mechanics", Front. Arch. Civ. Eng. China, 4(1), 1-39. https://doi.org/10.1007/s11709-010-0013-6
  2. Amini, Y., Hamidi, A. and Asghari, E. (2014), "Shear strengthdilation characteristics of cemented sand-gravel mixtures", Int. J. Geotech. Eng., 8(4), 406-413. https://doi.org/10.1179/1939787913Y.0000000026
  3. Bishop, A.W. (1967), "Progressive failure-with special reference to the mechanism causing it", Proceedings of the Geotechnical Conference on the Shear Strength of Natural Soil sand Rocks, Oslo, Norway.
  4. Changjiang Institute of Survey, Planning, Design and Research. (2016), "Report of field roller compaction test on rockfill materials with composite grout", Changjiang Institute of Survey, Planning, Design and Research, Wuhan, China.
  5. Chen, S.K., He, Q.D. and Cao, J.G. (2018), "Seepage simulation of high concrete-faced rockfill dams based on generalized equivalent continuum model", Water Sci. Eng., 11(3), 250-257. https://doi.org/10.1016/j.wse.2018.10.004
  6. Chen, S.S., Fu, Z.Z., Wei, K.M. and Han, H.Q. (2016), "Seismic responses of high concrete face rockfill dams: A case study", Water Sci. Eng., 9(3), 195-204. https://doi.org/10.1016/j.wse.2016.09.002
  7. Grzeszczyk, S. and Lipowski, G. (1997), "Effect of content and particle size distribution of high-calcium fly ash on the rheological properties of cement pastes", Cement Concrete Res., 27(6), 907-916. https://doi.org/10.1016/S0008-8846(97)00073-2
  8. Hua, J.J., Zhou, W., Chang, X.L. and Zhou, C.B. (2011), "Longterm deformation prediction of 300 m high rockfill dams", J. Sichuan Univ., 43(3), 33-38.
  9. Hyodo, M., Wu, Y., Kajiyama, S., Nakata, Y. and Yoshimoto, N. (2017), "Effect of fines on the compression behaviour of poorly graded silica sand", Geomech. Eng., 12(1), 127-138. https://doi.org/10.12989/gae.2017.12.1.127
  10. Kongsukprasert, L., Tatsuoka, F. and Tateyama, M. (2005), "Several factors affecting the strength and deformation characteristics of cement-mixed gravel", Soil. Found., 45(3), 107-124. https://doi.org/10.3208/sandf.45.3_107
  11. Langroudi, M.F., Soroush, A., Shourijeh, P.T., and Shafipour, R. (2013), "Stress transmission in internally unstable gap-graded soils using discrete element modeling", Powder Technol., 247(10), 161-171. https://doi.org/10.1016/j.powtec.2013.07.020
  12. Le, V.T., Marot, D., Rochim, A., Bendahmane, F. and Nguyen, H.H. (2017), "Suffusion susceptibility investigation by energy based method and stat", Can. Geotech. J., 55(1), 57-68. https://doi.org/10.1139/cgj-2017-0024
  13. Li, L.K., Wang, Z.J., Liu, S.H. and Bauer, E. (2016), "Calibration and performance of two different constitutive models for rockfill materials", Water Sci. Eng., 9(3), 227-239. https://doi.org/10.1016/j.wse.2016.11.005
  14. Li, S., Yu, S., Shangguan, Z. and Wang, Z. (2016), "Estimating model parameters of rockfill materials based on genetic algorithm and strain measurements", Geomech. Eng., 10(1), 37-48. https://doi.org/10.12989/gae.2016.10.1.037
  15. Ma, H.Q. and Chi, F.D. (2016), "Major technologies for safe construction of high earth-rockfill dams", Eng., 2(4), 498-509. https://doi.org/10.1016/J.ENG.2016.04.001
  16. Ma, K.L., Feng, J., Long, G.C., Xie, Y.J. and Cheng, X.B. (2017), "Rheological characteristic and its mechanism of cement-fly ash paste", J. Railway Sci. Eng., 14(3), 465-473.
  17. Marsal, R.J. (1967), "Large scale testing of rockfill materials", J. Soil Mech. Found. Div., 93(2), 27-43. https://doi.org/10.1061/JSFEAQ.0000958
  18. Mirza, J., Mirza, M.S., Roy, V. and Saleh, K. (2002), "Basic rheological and mechanical properties of high-volume fly ash grouts", Construct. Build. Mater., 16(6), 353-363. https://doi.org/10.1016/S0950-0618(02)00026-0
  19. Roussel, N., Nguyen, T.L.H. and Yazoghli, O. (2009), "Passing ability of fresh concrete: A probabilistic approach", Cement Concrete Res., 39(3), 227-232. https://doi.org/10.1016/j.cemconres.2008.11.009
  20. Senff, L., Labrincha, J.A., Ferreira, V.M., Hotza, D. and Repette, W.L. (2009), "Effect of nano-silica on rheology and fresh properties of cement pastes and mortars", Construct. Build. Mater., 23(7), 2487-2491. https://doi.org/10.1016/j.conbuildmat.2009.02.005
  21. Sherard, J.L. and Cooke, J.B. (1989), "Concrete-face rockfill dam: i. assessment", J. Geotech. Eng., 113(10), 1096-1112. https://doi.org/10.1061/(ASCE)0733-9410(1987)113:10(1096)
  22. Wang, Z. and Wong, R.C.K. (2010), "Effect of grain crushing on 1d compression and 1d creep behavior of sand at high stresses", Geomech. Eng., 2(4), 303-319. https://doi.org/10.12989/gae.2010.2.4.303
  23. Zhang, B.Y., Zhang, J.H., and Sun, G.L. (2015), "Deformation and shear strength of rockfill materials composed of soft siltstones subjected to stress, cyclical drying/wetting and temperature variations", Eng. Geol., 190, 87-97. https://doi.org/10.1016/j.enggeo.2015.03.006
  24. Zhong, Q.M., Chen, S.S. and Deng, Z. (2018), "A simplified physically-based breach model for a high concrete-faced rockfill dam: A case study", Water Sci. Eng., 11(1), 46-52. https://doi.org/10.1016/j.wse.2018.03.005
  25. Zhou, W., Li, S.L., Ma, G., Chang, X.L., Cheng, Y.G. and Ma, X. (2016), "Assessment of the crest cracks of the pubugou rockfill dam based on parameters back analysis", Geomech. Eng., 11(4), 571-585. https://doi.org/10.12989/gae.2016.11.4.571