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Monotonic, cyclic and post-cyclic performances of single-helix anchor in residual soil of sandstone

Journal of Rock Mechanics and Geotechnical Engineering 2019年第4期11卷 824-836页

作者： Jose Antonio Schiavon cristina de hollanda cavalcanti tsuha Luc Thorel department of Geotechnical Engineering Aeronautics Institute of TechnologySao Jose dos CamposBrazil department of Geotechnical Engineering University of Sao PauloSao CarlosBrazil IFSTTAR GERS DepartmentGeomaterials & Models in Geotechnics LaboratoryBouguenaisFrance

Helical anchors are commonly used in Brazil for guyed transmission towers subjected to static and cyclic wind *** most cases,these anchors are installed in tropical residual soil,a micro-structured material in which the shear strength is provided by soil *** installation of a helical anchor,as the helical plate moves downward into the ground,the soil penetrated is sheared and ***,in this type of soil,anchor installation affects the soil shear strength significantly associated with a bonded ***,the cyclic responses of helical anchors in this type of structured soils are rarely *** address this problem,tests were conducted in a Brazilian residual soil to investigate the monotonic,cyclic and post-cyclic performances of single-helix *** tests used two instrumented single-helix anchors installed in this typical residual soil of sandstone,which is frequently observed in large areas in the southern *** testing results indicate that the disturbance caused by the anchor installation affected the monotonic uplift performance *** results of cyclic loading tests also show no significant degradation of helix bearing resistance and reduced displacement accumulation with increasing load *** is perhaps due to the soil improvement caused by previous loading,which then increases the stiffness response of the anchor.

关键词： Helical anchors Tropical residual soil Cyclic loading Field load tests

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