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| Research on the Characteristics of Large-scale Shaking Table Experiment Slope and Dynamy of Micropiles |
| ZHENG Jing，NIU Wen-qing，WU Hong-gang，SHI Yan-qiu |
| (Northwest Research Institute Co. Ltd of China Railway Engineering Corporation,Lanzhou, Gansu 730000,China) |
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Abstract Abstract：Research purposes： Micropile is a flexible support structure, the bending deformation occurred in the earthquake can effectively avoid the brittle failure and thus the micropile is often preferred in seismic reinforcement. At present, the research of micropiles is mainly focused on the study of static characteristics and little research is carried out on the dynamic characteristics by large-scale shaking table. In order to study the dynamic characteristics of micropiles and their reinforcing slope which is supported by micropiles, this paper carries out the calculation analysis and large-scale shaking table test of slope which is supported by herringbone micropiles and parallel micropiles, and compares the anti-deformation ability and bearing capacity of two types of micropiles. Research conclusions： (1) The deformation of the slope begins from tensile cracks at the trailing edge of the slope after the earthquake, and the vertical cracks are more in the slope. The horizontal earthquake has a greater effect on the deformation of the slope. (2) Under the earthquake, the deformation of micropiles is shown as the "S"-shaped bending deformation bounded by slipping surface and the rotation deformation of pile from the top to the bottom. (3) The bending moment of the micropiles is shown as “S” shaped distribution and the shear force is showed as "〖JX*3〗〖HT4,5〗|〖HT〗〖JX-*3〗〖KG-1*5 〗〖HT5,2"〗>〖HT5SS〗" shaped distribution. (4)The anti-deformation ability and bearing capacity of the herringbone micropiles are stronger than those of parallel micropiles. (5) The research results are mainly used in reinforcing and rescuing slope engineering.
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Received: 13 July 2017
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2017, Vol. 34 
