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(1.东北电力大学 建筑工程学院, 吉林 吉林 132012;2.北京工业大学 建筑工程学院, 北京 100124;3.中国电力工程顾问集团东北电力设计研究院有限公司, 吉林 长春 130021;4.上海海事大学 海洋科学与工程学院, 上海 201306;5.河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098)
Numerical Analysis of Uplift Bearing Mechanism for Shallow Circular or Helical Anchor Plate in Sand
(1.School of Civil Eng. and Architecture, Northeast Electric Power Univ., Jilin 132012, China;2.College of Architecture and Civil Eng., Beijing Univ. of Technol., Beijing 100124, China;3.Northeast Electric Power Design Institute Co., Ltd. of China Power Eng. Consulting, Changchun 130021, China;4.College of Ocean and Eng., Shanghai Maritime Univ., Shanghai 201306, China;5.Key Lab. of Geomechanics and Embankment Eng. (Hohai Univ.), Ministry of Edu., Nanjing 210098, China)

Abstract:A numerical study combining coupled Eulerian-Lagrangian method to large deformation analysis and modified Mohr-Coulomb elastic-plastic constitutive model that can describe the soil behavior of strain softening has been performed to investigate the pullout mechanism of circular or helical anchor plates in sand. The validity of the numerical model has been established through the comparison against the centrifugal tests of single-helix anchors. The uplift failure mechanism of circular anchors in sand with different compactnesses was then investigated. The failure modes, distributions of normal stress and changes of soil strength along failure surfaces in loose, medium and dense sands have been analyzed. It was demonstrated that the coefficients of lateral earth pressures and the friction angles along the failure surface were not constant. The coefficient of lateral earth pressure rose linearly from the edge of the plate, up to the peak value at approximately 0.2D (plate diameter), and then decreased exponentially to a stable value. The equivalent friction angle along the failure surfaces in loose and medium sand could be determined by the reduction formula proposed by Davis, and it would be overestimated approximately 3° in the dense sand. Furthermore, a theoretical calculation method for the uplift capacity of shallow circular or helical anchor plates was proposed based on the above analyses. Meanwhile, the comparison among several existing theoretical formulas has been made, and the applicability for each formula has been proposed, which can provide references for the engineering design.

HAO Dongxue,YUAN Chi,CHEN Rong,ZHANG Xin,SHI Danda,KONG Gangqiang.Numerical Analysis of Uplift Bearing Mechanism for Shallow Circular or Helical Anchor Plate in Sand[J].Advanced Engineering Sciences,2022,54(2):101-112.