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| Research on the Ultimate Resistance of Antislide Micropile in Slope Stabilization |
| SUN Shu-wei1, ZHU Ben-zhen2, FENG Meng-qian1 |
| (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： The antislide micropile has the advantages of flexible arrangement, fast construction, strong adaptation to the construction site and marginal environment impact. In recent years, the antislide micropile has been widely used and popularized in the field of slope reinforcement. However, there is no scientific method to analyze the ultimate resistance of the micropile in slope stabilization at present. Therefore, a simplified numerical model for analyzing the resisting force of the micropile is set up and an approach is proposed to calculate the ultimate resistance under the controlling of bending bearing capacity, shear bearing capacity and pile horizontal displacements. The loading mechanism is studied by the proposed method. Research conclusions： (1) The ultimate resistance of micropile is different with type of slope materials, and for the higher strength of slope, the micropile provides the greater ultimate resistance. In general, the ultimate resistance of the antislide micropile is mainly controlled by the bending capacity and shear capacity of the pile section for the soil and rock slope, respectively. (2) The thrust is mainly carried by the half-piles near the load, and the half-piles away from the load are not subject to force. (3)The resistance between the micropile and soil is mainly provided by the normal stress of the pile elements near the load, and the shear stress has a marginal and negligible effect. (4) The research results provide theoretical guidance for the design and safety evaluation of antislide micropile in slope engineering.
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Received: 13 March 2017
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2017, Vol. 34 
