Analysis of a New Combined Micropile Structure for Preventing Slope Slippage and Its Application in a Practical Project
by S. G. Xiao, (Department of Geotechnical Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China E-mail: xiaoshiguol26@126.com), K. Cui, (Department of Geotechnical Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China E-mail: cuikai80@hotmail.com), D. P. Zhou, (Department of Geotechnical Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China E-mail: dpzhou@home.swjtu.edu.cn), and J. Feng, (Department of Geotechnical Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China E-mail: fengjun4316@163.com)
pp. 1-11, (doi: http://dx.doi.org/10.1061/41064(358)5)
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| Document type: |
Conference Proceeding Paper |
| Part of: |
ICCTP 2009: Critical Issues In Transportation Systems Planning, Development, and Management |
| Abstract: |
We discuss the combining of micropile substructures to produce a new retaining and reinforcement structure for slopes. Each substructure is an element comprising of several separated micropiles connected by a roof plate. The structure has the advantages of small pile length, easy and quick construction, operational safety, and low cost. It can be applied to a moderate or small slope or in landslide control projects. In particular, the structure is very suitable for dealing with project emergencies. According to the general load features of the structure, it is believed that the part of the structure above the slip surface of a landslide may be regarded as a single rigid frame under landslide thrust and that the part under the slip surface may be treated as an elastic axial bar model. In this way, internal forces of the structure and the required length of the anchoring section of the micropiles can be obtained. This information is used directly in practical design. Analysis shows that each micropile in the structure is mainly loaded by an axial force, but the roof plate is principally subject to a bending moment. The new structure and the analysis method proposed in this paper are successfully used in practice for a cutting slope in a Guangyuan-Bazhong expressway project in Sichuan Province, China, and the performance of the structure is verified. |
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