Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Experimental study on the tensile strength of gravelly soil with different gravel content

  • Ji, Enyue (Geotechnical Engineering Department, Nanjing Hydraulic Research Institute) ;
  • Chen, Shengshui (Geotechnical Engineering Department, Nanjing Hydraulic Research Institute) ;
  • Zhu, Jungao (Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University) ;
  • Fu, Zhongzhi (Geotechnical Engineering Department, Nanjing Hydraulic Research Institute)
  • Received : 2018.06.02
  • Accepted : 2019.02.08
  • Published : 2019.02.28
⟨ Previous Next ⟩

Abstract

In recent years, the crack accidents of earth and rockfill dams occur frequently. It is urgent to study the tensile strength and tensile failure mechanism of the gravelly soil in the core for the anti-crack design of the actual high earth core rockfill dam. Based on the self-developed uniaxial tensile test device, a series of uniaxial tensile test was carried out on gravelly soil with different gravel content. The compaction test shows a good linear relationship between the optimum water content and gravel content, and the relation curve of optimum water content versus maximum dry density can be fitting by two times polynomial. For the gravelly soil under its optimum water content and maximum dry density, as the gravel content increased from 0% to 50%, the tensile strength of specimens decreased from 122.6 kPa to 49.8 kPa linearly. The peak tensile strain and ultimate tensile strain all decrease with the increase of the gravel content. From the analysis of fracture energy, it is proved that the tensile capacity of gravelly soil decreases slightly with the increasing gravel content. In the case that the sample under the maximum dry density and the water content higher than the optimum water content, the comprehensive tensile capacity of the sample is the strongest. The relevant test results can provide support for the anti-crack design of the high earth core rockfill dam.

Keywords

Acknowledgement

Supported by : China Postdoctoral Science Foundation, Hohai University

References

  1. ASTM (2000), ASTM D2487: Standard Classification of Soils for Engineering Purposes (Unified Soil Classification System), ASTM International, West Conshohocken, Pennsylvania, U.S.A.
  2. ASTM (2000), ASTM D2488: Standard Practice for Description and Identification of Soils (Visual-Manual Procedure), ASTM International, West Conshohocken, Pennsylvania, U.S.A.
  3. ASTM (2000), ASTM D4767-02: Standard Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils, ASTM International, West Conshohocken, Pennsylvania, U.S.A.
  4. Chin, E.B., Lasserre, J.B. and Sukumar, N. (2017), "Modeling crack discontinuities without element-partitioning in the extended finite element method", Int. J. Numer. Meth. Eng., 110(11), 1021-1048. https://doi.org/10.1002/nme.5436
  5. Divya, P.V., Viswanadham, B.V.S. and Gourc, J.P. (2013), "Evaluation of tensile strength-strain characteristics of fiberreinforced soil through laboratory tests", J. Mater. Civ. Eng., 6(1), 14-23.
  6. Heibrock, G., Zeh, R.M. and Witt, K.J. (2005), Tensile Strength of Compacted Clays, in Unsaturated Soils: Experimental Studies, Springer, Berlin, Heidelberg, Germany, 395-412.
  7. Iravanian, A. and Bilsel, H. (2016), "Tensile strength properties of sand-bentonite mixtures enhanced with cement", Proc. Eng., 143, 111-118. https://doi.org/10.1016/j.proeng.2016.06.015
  8. Ji, E., Fu, Z., Chen, S., Zhu, J. and Geng, Z. (2018), "Numerical simulation of hydraulic fracturing in earth and rockfill dam using extended finite element method", Adv. Civ. Eng.
  9. Komurlu, E., Kesimal, A. and Demir, A.D. (2017), "Dog bone shaped specimen testing method to evaluate tensile strength of rock materials", Geomech. Eng., 12(6), 883-898. https://doi.org/10.12989/GAE.2017.12.6.883
  10. Komurlu, E., Kesimal, A., and Demir, S. (2016), "Experimental and numerical analyses on determination of indirect (splitting) tensile strength of cemented paste backfill materials under different loading apparatus", Geomech. Eng., 10(6), 775-791. https://doi.org/10.12989/gae.2016.10.6.775
  11. Liu, F., Gordon, P., Meier, H. and Valiveti, D. (2017), "A stabilized extended finite element framework for hydraulic fracturing simulations," Int. J. Numer. Anal. Meth. Geomech., 41(5), 654-681. https://doi.org/10.1002/nag.2565
  12. Lu, L.N., Fan, H.H. and Chen, H. (2014), "Influencing factors for uniaxial tensile strength of dispersive soils", Chin. J. Geotech. Eng., 36(6), 1160-1166 (in Chinese).
  13. Lv, H.B., Zeng, Z.T., Ge, R.D. and Zhao, Y.L. (2013), "Experimental study of tensile strength of swell-shrink soils", Rock Soil Mech., 34(3), 615-620 (in Chinese).
  14. Shinde, S.B., Kala, V.U., Kadali, S., Tirumkudulu, M.S. and Singh, D.N. (2012), "A novel methodology for measuring the tensile strength of expansive clays", Geomech. Eng., 7(1), 15-25.
  15. Su, K., Zhou, X. Y. and Tang, X.H. (2018), "Mechanism of cracking in dams using a hybrid FE-meshfree method", Int. J. Geomech., 17(9), 1396-1409.
  16. Sun W.Y., Liang, Q.G. and Ou, E.F. (2005), "Comparative experimental study on tensile strength of undisturbed and remolded Q2 loess from Yan'an Shanxi, China", Chin. Civ. Eng. J., 48(S2), 53-58 (in Chinese).
  17. Tang, C.S., Wang, D.Y., Cui, Y.J., Shi, B. and Li, J. (2016), "Tensile strength of fiber-reinforced soil", J. Mater. Civ. Eng., 28(7), 4016031. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001546
  18. Tang, G.X. and Graham, J. (2000), "A method for testing tensile strength in unsaturated soils", Geotech. Test. J., 23(3), 377-382. https://doi.org/10.1520/GTJ11059J
  19. Tang, Y., Taiebat, H.A. and Russell, A.R. (2017), "Bearing capacity of shallow foundations in unsaturated soil considering hydraulic hysteresis and three drainage conditions", Int. J. Geomech., 17(6), 04016142. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000845
  20. Tej, P.R. and Singh, D.N. (2012), "Estimation of tensile strength of soils from penetration resistance", Int. J. Geomech., 13(5), 496-501. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000234
  21. Tutmez, B. (2017), "Comparison of measurement uncertainty calculation methods on example of indirect tensile strength measurement", Geomech. Eng., 12(6), 871-882. https://doi.org/10.12989/gae.2017.12.6.871
  22. Wang, J.J., Zhu, J.G., Mroueh, H. (2016), "Hydraulic fracturing of rock-fill dam", Int. J. Multiphys., 1(2), 199-219. https://doi.org/10.1260/175095407781421595
  23. Zhang, B.Y., Li, Q.M., Yuan, H.N. and Sun, X. (2014), "Tensile fracture characteristics of compacted soils under uniaxial tension", J. Mater. Civ. Eng., 27(10), 04014274. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001250
  24. Zhang, H., Chen, J.K., Hu, S.W. and Xiao, Y.Z. (2015), "Deformation characteristics and control techniques at the Shiziping earth core rockfill dam", J. Geotech. Geoenviron. Eng., 142(2), 04015069. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001385
  25. Zhou, C. and Ng, C.W.W. (2014), "A new and simple stressdependent water retention model for unsaturated soil", Comput. Geotech., 62, 216-222. https://doi.org/10.1016/j.compgeo.2014.07.012
  26. 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
  27. Zhu, J.G, Liang, B., Chen, X.M. and Cao, R. (2007), "Experimental study on unaxial tensile strength of compacted soils", J. Hohai Univ. Nat. Sci., (02), 186-190 (in Chinese).
  28. Zhu, J.G., Ji, E.Y., Wen, Y.F. and Zhang, H. (2015), "Elasticplastic solution and experimental study on critical water pressure inducing hydraulic fracturing in soil", J. Central South Univ., 22(11), 4347-4354. https://doi.org/10.1007/s11771-015-2983-y