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Geomechanics and Engineering
  Volume 7, Number 2, August 2014 , pages 165-181

Experimental and numerical investigation of uplift behavior of umbrella-shaped ground anchor
Hong-Hu Zhu, Guo-Xiong Mei, Min Xu, Yi Liu and Jian-Hua Yin

    In the past decade, different types of underreamed ground anchors have been developed for substructures requiring uplift resistance. This article introduces a new type of umbrella-shaped anchor. The uplift behavior of this ground anchor in clay is studied through a series of laboratory and field uplift tests. The test results show that the umbrella-shaped anchor has higher uplift capacity than conventional anchors. The failure mode of the umbrella-shaped anchor in a large embedment depth can be characterized by an arc failure surface and the dimension of the plastic zone depends on the anchor diameter. The anchor diameter and embedment depth have significant influence on the uplift behavior. A finite element model is established to simulate the pullout of the ground anchor. A parametric study using this model is conducted to study the effects of the elastic modulus, cohesion, and friction angle of soils on the load-displacement relationship of the ground anchor. It is found that the larger the elastic modulus and the shear strength parameters, the higher the uplift capacity of the ground anchor. It is suggested that in engineering design, the soil with stiffer modulus and higher shear strength should be selected as the bearing stratum of this type of anchor.
Key Words
    umbrella-shaped anchor; pullout behavior; uplift test; numerical analysis; uplift capacity
(1) Hong-Hu Zhu:
School of Earth Sciences and Engineering, Nanjing University, Nanjing, China;
(2) Guo-Xiong Mei, Min Xu, Yi Liu:
College of Transportation Science and Engineering, Nanjing Tech University, Nanjing, China;
(3) Jian-Hua Yin:
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China.

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