Centrifuge modeling of the geogrid-reinforced slope subjected to differential settlement
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RESEARCH PAPER
Centrifuge modeling of the geogrid-reinforced slope subjected to differential settlement Fangyue Luo1 • Renlong Huang2 • Ga Zhang1 Received: 2 October 2019 / Accepted: 17 June 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A series of centrifuge model tests of geogrid-reinforced slopes with superstructure was conducted under differential settlement condition. The influence of reinforcement placement on the deformation and failure behavior of the slope and superstructure is investigated by considering different numbers of geogrid layers. The response of the slope and superstructure is analyzed based on a full-field displacement measurement via image analysis. The differential settlement induces distinguishable superstructure movement and slope deformation above the subsidence zone. The slope displacement, close to the vertical direction, appears only in a limited zone. An integrated analysis scheme of deformation and failure processes is adopted to reveal the failure mechanism of both the unreinforced and reinforced slopes: a certain level of deformation localization induced by differential settlement results in the local failure, and adversely, the local failure aggravates the deformation localization near it. The geogrid reinforcement mechanism is further clarified as the reduction on the deformation localization of the slope due to geogrid placement. The geogrid reinforcement effect can be comprehensively described with two respects: hooping effect and shielding effect, which illustrates the influence sphere and degree of geogrid reinforcement on restraining the slope deformation. The geogrid reinforcement is proven effective to improve the safety of the slope and superstructure. Keywords Centrifuge model test Deformation Failure Geosynthetics Slope
1 Introduction Situations like excavation, excessive and uneven area load, over-extraction of groundwater, coal mining and so on are likely to result in differential settlement of the soil [1]. Differential settlement is one of the primary reasons for the cracks or collapses in soil slopes and the subsequent failure of surrounding superstructures [18]. Geosynthetics have & Ga Zhang [email protected] Fangyue Luo [email protected] Renlong Huang [email protected] 1
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
2
China Institute of Water Resources and Hydropower Research, Beijing, People’s Republic of China
been proven successful in improving the safety of soils and widely used in road enhancement, foundation strengthening and slope reinforcement [11]. A good design of geosynthetics to reinforce unsafe soils absolutely requires an effective stability analysis method under differential settlement condition. Various limit equilibrium methods were proposed and adopted in the stability analysis of the geosynthetic-reinforced structures due to their simplicity [9, 16, 24, 25]. Zornberg [3
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