Anchorage Behaviors of Tieback Anchor Groups in Silty Sand

• Main Authors: Chih-lun Tsai, 蔡志倫
• Other Authors: Shih-Tsung Hsu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/22172907947630341372

碩士 === 朝陽科技大學 === 營建工程系碩士班 === 102 === This study performed a series of numerical analyses to elucidate the behavior of tieback anchor groups in silty sand. Along with the constitutive model for the cohesionless soil named SHASOVOD (A continuous strain hardening-softening and volumetric dilatancy model), this research adopted triaxial tested results to obtain the parameters of the model. In conjunction with FLAC3D software, a succession of parametric analyses was carried out to study the anchorage behaviors of anchor groups in silty sand. According to the numerical results, when aligned tirple anchors installed in silty sand with a spacing Sh of 4D (D is the anchor diameter), efficiencies of anchor groups were calculated to be only 74% - 78%. As the Sh equaled 10D, the efficiencies of anchor groups exceeded 96% - 97%. Interference almost can be eliminated as the anchor spacing exceeded 10D for anchor groups with various overburdens and free lengths. It can be found from the numerical results, the interference of an aligned quaternary anchors was larger than that of an aligned triple anchors. Obviously, the more the anchors installed in a group, the more the interference occurs in the anchor group.