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| Numerical Simulation Study of the Ultimate Resistance of Micropiles in Earth Slope Stabilization |
| SUN Shu-wei1, ZHU Ben-zhen2 |
| (1. China University of Mining and Technology (Beijing), Beijing, 100083, China; 2. China Railway Group Limited, Beijing 100039, China) |
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Abstract Abstract：Research purposes： Micropiles are defined as small-diameter (typically less than 300 mm). Due to the small resistance of a micropile, micropiles are always designed as a group in earth slope stabilization. Micropiles-slope system is a complex three-dimensional space system and the mechanism of loading is very complex, and there is lack of scientific method to analyze the ultimate resistance of micropiles in slope stabilization. In this paper, the ultimate resistance of micropiles in earth slope stabilization was studied systematically, and influential parameters were also analyzed. Research conclusions： (1) The ultimate resistance of micropiles increases significantly as the pile spacing in row decreases, however, the reinforcing efficiency of a micropile in the group will decrease. This means that, for economical design, the special attention should be paid on the reinforcing efficient of a micropile under the premise of ensuring the ultimate resistance of group piles. (2) The ultimate resistance of micropiles is not sensitive with the pile spacing in line. (3) The total resistance of reinforcement system increases with the increase of anchorage length, and micropiles deformation transforms from rigid-body rotation to substantial flexural distortion due to the increase of anchorage length. For earth slope stabilization, the optimal anchorage length is about 2 times of the length above sliding surface. (4) The research results provide theoretical guidance for the design and safety evaluation of micropiles in earth slope stabilization.
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Received: 09 October 2017
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2018, Vol. 35 
