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International Journal of Civil Engineering

, Volume 18, Issue 2, pp 199–214 | Cite as

A Simplified Analytical Method for Stabilizing Micropile Groups in Slope Engineering

  • Jinxiu Zeng
  • Shiguo XiaoEmail author
Research paper
  • 81 Downloads

Abstract

Stabilizing micropile groups is a light retaining structure constructed quickly and safely for slope reinforcement in practice. To carry out engineering design of any structure, a simplified analytical procedure for a micropile group with consideration of stability of the piled slope is presented. According to the upper bound theorem of kinematical limit analysis, an analytical method is proposed to evaluate the net thrust force on a micropile group with 3 × 3 layout of piles and the slip surface of the piled slope for a specified factor of safety. Then, internal forces of the micropile group can be computed using plane rigid frame model for the part of the structure above the slip surface under the net thrust force and beam-on-elastic-foundation model for the rest part. A laboratory model test and corresponding 3D-numerical simulation are conducted to verify the proposed method. Moreover, analysis of a practical slope shows that flexural rigidity of a micropile and micropile numbers of a group have a great effect on internal forces of micropiles. In particular, the internal forces are relatively sensitive to pile numbers in a group. However, micropile length and spacing in plane in a group have little effect on the internal forces, which is rather different from traditional stabilizing piles with a large cross section.

Keywords

Slope Stabilizing micropile group Limit analysis Model test Numerical simulation 

Notes

Acknowledgements

The research was supported by the National Natural Science Foundation of China (Grant Nos. 51278430 and 51578466) and the Program for New Century Excellent Talents in University (NCET-13-0976). Besides, the authors would also like to appreciate the anonymous reviewers giving useful suggestion in improving this article.

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Copyright information

© Iran University of Science and Technology 2019

Authors and Affiliations

  1. 1.Department of Geological EngineeringSouthwest Jiaotong UniversityChengduChina
  2. 2.Key Laboratory of High-Speed Railway EngineeringMinistry of Education, Southwest Jiaotong UniversityChengduChina

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