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| Comparative Research on Internal Force Calculations of Herringbone Micropiles System on Sliding Surface |
| AN Meng-kang, ZHENG Jing, MENG Jin-bao, SU Jun-xia |
| Northwest Research Institute Co. Ltd of C.R.E.C, Lanzhou, Gansu 730000, China |
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Abstract Abstract：Research purposes：Generally, for structure system of micro-pile connection on the top, it calculates the internal force on sliding surface by summing each pill force, but not considering the structure is unreasonable. In this paper, the herringbone micro-pile above the sliding surface is divided into three types: single pile, top-hinged-joint steel frame construction and top-fixed-connection steel frame construction. Under the condition of landslide force which is rectangular distribution, the calculation formula of internal force of sliding surface is deduced and comparatively studied.
Research conclusions：(1) Comparing the calculation formula of simplified single pile model with frame structure model, the results make a big difference. (2) Under the calculation method of frame structure model, the bending moment and shear force are dwindling but axial force is increasing. It indicates that the method does not apply to force calculation of the micro-pile system. This calculation result of simplified model take insufficient account to withdrawal resistance of pile body in micro-pile system. The calculation also indicates that the method of top-connection steel frame construction has less effect to calculation result. (3) The research result can be referenced in designing area of similar anti-slide structure system.
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