Anchorage Behaviors of Frictional Tieback Anchors in Silty Sand

2nd International Conference on Civil Engineering and Materials Science

Hsu, Shih-Tsung^1 ; Hsiao, Wen-Ta^1 ; Chen, Ke-Ting^1 ; Hu, Wen-Chi^2 ; Wu, Ssu-Yi^3

Department of Construction Engineering, Chaoyang University of Technology, 168, Jifeng E. Rd., Wufeng Dist., Taichung, Taiwan^1

Department of English, Taichung University of Education, No. 140, Minsheng Rd., Taichung, Taiwan^2

Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Rd., Da'an Dist., Taipei, Taiwan^3

关键词: 3-D numerical analysis;    Anchorage behaviors;    Anchorage mechanisms;    Geotechnical application;    Numerical results;    Parameter studies;    Surrounding soils;    Volume dilatancy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/216/1/012038/pdf
DOI  :  10.1088/1757-899X/216/1/012038

来源: IOP

【 摘 要 】

Soil anchors are extensively used in geotechnical applications, most commonly serve as tieback walls in deep excavations. To investigate the anchorage mechanisms of this tieback anchor, a constitutive model that considers both strain hardening and softening and volume dilatancy entitled SHASOVOD model, and FLAC3Dsoftware are used to perform 3-D numerical analyses. The results from field anchor tests are compared with those calculated by numerical analyses to enhance the applicability of the numerical method. After the calibration, this research carried out the parameter studies by numerical analyses. The numerical results reveal that whether the yield of soil around an anchor develops to ground surface and/or touches the diaphragm wall depending on the overburden depth H and the embedded depth Z of an anchor, this study suggests the minimum overburden and embedded depths to avoid the yield of soils develop to ground surface and/or touch the diaphragm wall. When the embedded depth, overburden depth or fixed length of an anchor increases, the anchorage capacity also increases. Increasing fixed length should be the optimum method to increase the anchorage capacity for fixed length less than 20m. However, when the fixed length of an anchor exceeds 30 m, the increasing rate of anchorage capacity per fixed length decreases, and progressive yield occurs obviously between the fixed length and surrounding soil.