Advertisement

Journal of Central South University

, Volume 18, Issue 3, pp 874–880 | Cite as

Mechanism of grout bulb expansion and its effect on ground uplifting

  • Min Zhang (章敏)
  • Xing-hua Wang (王星华)Email author
  • You Wang (汪优)
Article

Abstract

In order to study the uplifting effect of compensation grouting on ground surface and the upper structures, the ground heave induced by stratum expansion was considered as a stochastic process and the stochastic medium theory was applied to determine the heave and deformation of ground surface under uniform and non-uniform expansion models of spherical grout bulb. The corresponding calculating formulas and simplified methods were derived based on the hypotheses of radial expansion. Then, a numerical model, in which radial velocity was imposed on the outer nodes of grout bulb to simulate the expansion process reaching a required volume strain, was established simultaneously. This new method avoids repeated trial calculation needed in the traditional method which applies a “fictitious” expanding pressure in the grouting elements. The results show that the numerical solutions have good consistency with the theoretical ones. Meanwhile, though the heave resulting from non-uniform expansion is larger than that from uniform expansion for shallow grouting, both of them tend to be convergent with the increasing of grouting depth.

Key words

grouting ground surface uplifting stochastic medium theory numerical simulation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    JAMES C N, CHENG W C. Grout efficiency of lifting structure in soft clay [C]// Soil and Rock Instrumentation, Behavior, and Modeling. Virginia: ASCE, 2009: 1–8.Google Scholar
  2. [2]
    YANG Xiao-li, ZOU Jin-feng. Cavity expansion analysis with non-linear failure criterion [J]. Proceedings of the ICE-Geotechnical Engineering, 2011, 164(1): 41–49.CrossRefGoogle Scholar
  3. [3]
    YANG Xiao-li, ZOU Jin-feng. Estimation of compaction grouting pressure in strain softening soils [J]. Journal of Central South University of Technology, 2009, 16(4): 653–657.CrossRefGoogle Scholar
  4. [4]
    GRAF E D. Compaction grout [C]// Grouting, soil improvement and geosynthetics [J]. Reston, VA: ASCE, GSD, 1992, 1 (30): 275–287.Google Scholar
  5. [5]
    PRASENJIT B, MADHAV M R, PREZZI M. Estimation of heave due to inclined compaction grouting [C]// Advances in Ground Improvement Research to Practice in the United States and China. Florida: ASCE, 2009: 234–241.Google Scholar
  6. [6]
    WISSER C, EAUGARDE C, BURD H J. Numerical modeling of compensation grouting above shallow tunnels [J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2005, 29: 443–471.CrossRefGoogle Scholar
  7. [7]
    TANG Zhi-wei, ZHAO Cheng-gang, ZHANG Ding-li. Design of displacement grouting and prediction of the effect for construction of underground structures [J]. China Civil Engineering Journal, 2007, 40(8): 79–84. (in Chinese)Google Scholar
  8. [8]
    YANG J S, LIU B C, WANG M C. Modeling of tunneling-induced ground surface movements using stochastic medium theory [J]. Tunnelling and Underground Space Technology, 2004, 19: 113–123.CrossRefGoogle Scholar
  9. [9]
    LIU Bao-chen. Ground surface movements due to underground excavation in China [C]// Comprehensive Rock Engineering. New York: Pergamon Press, 1993: 781–817.Google Scholar
  10. [10]
    TIMOSHENKO S P, GOODIER J N. Theory of elasticity [M]. 3rd ed. New York: McGraw Hill, 1970: 125–145.Google Scholar
  11. [11]
    YANG Xiao-li, WANG Jin-ming. Ground movement prediction for tunnels using simplied procedure [J]. Tunnelling and Underground Space Technology, 2011, 26(3): 462–471.CrossRefGoogle Scholar
  12. [12]
    NICOLINI E. NOVA R. Modeling of a tunnel excavation in a non-cohesive soil improved with cement injections [J]. Computers and Geotechnics, 2000, 27: 2149–2172.CrossRefGoogle Scholar
  13. [13]
    HELMUT F, SCHWEIGER, KUMMERER C. Numerical modeling of settlement compensation by means of fracture grouting [J]. Soils and Foundations, 2004, 44(1): 71–86.CrossRefGoogle Scholar
  14. [14]
    GOLEGGET J. Numerical and analytical studies of the effects of compensation grouting [D]. Austria: Graz University of Technology, 2001.Google Scholar
  15. [15]
    ADDENBROOKE T, ONG J, POTTS D M. Finite-element analysis of a compensation grouting field trial in soft clay [J]. Proceedings of the Institution of Civil Engineers, Geotechnical Engineering, 2002, 115(1): 47–58.CrossRefGoogle Scholar
  16. [16]
    FLAC3D-User’s manual [M]. Minneapolis, MN: Itasca Consulting Group Inc, 2005.Google Scholar

Copyright information

© Central South University Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Min Zhang (章敏)
    • 1
  • Xing-hua Wang (王星华)
    • 1
    Email author
  • You Wang (汪优)
    • 1
  1. 1.School of Civil and Architectural EngineeringCentral South UniversityChangshaChina

Personalised recommendations