Analysis of Slope Failure Mechanisms Considering Micropile-Soil Interaction

Abstract:

A large scale model test was carried out in loess slope, in which the stress and deformation characteristics of slopes reinforced with different arrangements of micropiles were studied. The mechanism of the micropile-soil interaction and the reinforcement effect of micropiles in loess slope were analysed. Based on the scale of in-situ loess slope and the physical mechanics parameters of loess soil, a numerical model was established by using finite difference method. For a reasonable arrangement of micropiles in step-shaped slope, the critical slip surfaces were determined considering the influence of slope inclination, ratio of step height and loading position. The micropiles were arranged in the step-shaped slope based on the critical slip surface, and the relationship between the ultimate bearing capacity of slope and shear strength parameters of loess soil was studied. The maximum shear strain of micropile-soil and moment of micropiles were calculated, and then the mechanism of the micropile-soil interaction was analysed.

• Periodical: Key Engineering Materials (Volumes 535-536)
• Pages: 565-568
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.535-536.565
• Online since: January 2013
• Authors: Hong Jian Liao, Cheng Lin Tian, Hang Zhou Li
• Keywords: Bearing Capacity, FLAC, Micropile, Shear Strength Parameter, Slope

References

[1] J. Bruce, M. Ruel, N. Ansari, Design and construction of a micropile wall to stabilize a railway embankment, Deep Foundations Institute Annual Conference on Deep Foundations: Emerging Technologies, Vancouver: [s.n.], 2004.

[2] D.P. Zhou, H.L. Wang, H.W. Sun, Micro-pile composite structure and its design theory, Chinese Journal of Rock Mechanics and Engineering. 28, (2009) 1353-1362.

[3] C.L. Ho, Model tests of micropile networks applied to slope stabilization, Proceedings of the 14th International Conference on Soil Mechanics and Foundation Engineering, A.A. Balkema Publishers, 2, (1997) 1223-1226.

[4] J.Feng, Study on stability and support of consequent bedding rock slope, Cheng du:Southwest JiaoTong University, China, 2005.

[5] S.C. Wu, Y.T. Gao , A.B. Jin, Study on reinforcement of micro-pile and rockbolt for an unstable high-steep road cut slope, Chinese Journal of Rock Mechanics and Engineering. 24 (2005) 3954-3958.

[6] B.L. Zhu, H.T. Hu, Y.F. Zhang, Application of steel-tube bored grouting anti-sliding retaining wall to treatment of landslide K108 in Beijin-Zhuhai expressway, Chinese Journal of Rock Mechanics and Engineering. 25 (2006) 399-406.

DOI: 10.4028/www.scientific.net/amr.261-263.1872

[7] J.K. Yan, Model test study on micropiles in landslide reinforcement, Xi'an: Chang'an University, China, 2010.