Cross-Scale Analysis on the Working Performance of Micropile Group and Talus Slope System

Zhenwei Pei, Yanjun Zhang (), Tingkai Nian (), Shiguo Xiao and Hongshuai Liu
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Zhenwei Pei: School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
Yanjun Zhang: Wuhan Center of China Geological Survey (Central South China Innovation Center for Geosciences), Wuhan 430205, China
Tingkai Nian: School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
Shiguo Xiao: Key Laboratory of High-Speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
Hongshuai Liu: Institute of Geotechnical Engineering, Hebei University, Baoding 071000, China

Sustainability, 2023, vol. 15, issue 10, 1-24

Abstract: Micropile groups (MPGs), combined with the advantages of the anti-slip pile and anchor cable, offer an efficient support system that can be used as countermeasures for stabilizing the talus slopes. However, the performance of MPGs in stabilizing the talus slopes is rarely numerically investigated from the continuous-discontinuous viewpoints. To fulfil this knowledge gap, a numerical method coupled with the discrete element method (DEM) with the finite element method (FEM) is proposed first, and validated to be with good accuracy by the centrifuge model tests. A series of cross-scale analysis cases are then adopted to assess the behavior of MPG in the talus slopes, in which the influencing factors are also taken into account. The numerical results indicate that the MPGs reinforcement can significantly improve the stability of the talus slopes, avoiding the potential progressive shallow slip. For the MPGs with different pile spacing, the distribution laws of deformation and internal force are rather similar, but the one whose pile spacing is four times the pile diameter shows better performance. Moreover, the effective anchorage length of MPG is approximately 1/3 of the pile length, and the axial force distribution is influenced by the type of pile bottom constraint and the tangential contact between the micropile and the bedrock. Finally, the “bidirectional anchorage” attributed to the platform and the bedrock can greatly improve the performance of the MPG, which is a non-negligible part of the anti-slip mechanism of the MPG. This study is of great significance for facilitating the design of MPG in stabilizing the talus slopes.

Keywords: micropile group (MPG); stabilization of talus slopes; cross-scale analysis; pile spacing (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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