Uplift capacity of circular plate anchors in layered soil

Abstract

For anchors embedded in cohesive soil, the uplift capacity remains almost constant when the ratio of anchor embedment depth to anchor diameter (D/B) increases above about 4.5. The uplift capacity of anchors in cohesionless soil increases as D/B increases and the increase is greater with increased density of the cohesionless soil. Then, given that an anchor is embedded in cohesive soil, it may be possible to increase the uplift capacity of the anchor by placing a cohesionless overlay on the clay layer.The purpose of the model tests reported in this note was to investigate the effectiveness of placement of a cohesionless layer over a clay seabed in increasing the uplift capacity of a shallow anchor buried in the clay (D/B < 2.0). The sand overburden did increase the uplift capacity, but to obtain a substantial increase in capacity, a very large anchor displacement is required. In fact, the anchor had to displace through almost the entire clay layer before it mobilized the frictional resistance of the sand overlay. Key words: circular anchor, uplift, layered system.

Comparison of Uplift Capacity and Nonlinear Failure Surfaces of Single‐Belled Anchor in Homogeneous and Layered Sand Deposits

“…is type of net uplift capacity vs. anchor displacement behaviour is dominated by the strength differences in top and bottom layers of sand. A similar pattern of relationship in net uplift capacity vs. anchor displacement curves was reported by Stewart [35] for plate anchors installed in soft clay underlying comparatively dense sand. In layered sand, for same model, the net uplift capacity vs. anchor displacement curves show more upward movement than that of homogeneous sand as the thickness of S II gradually increases with higher value of embedment ratio.…”

Numerical Study on Static Interaction of Closely Spaced Horizontal Square or Rectangular Ground Anchors in c-ϕ Soil

“…Hence, the determination of interaction of closely spaced horizontal ground anchors is found to be quite sensible investigation as it might cause major catastrophe. A number of investigations have been performed by several researchers to predict the uplift resistance of single isolated anchor with the help of different numerical as well as experimental investigations [1][2][3][4][5][6][7][8][9][10][11][12][13]. However, in a number of situations, anchors may be placed in a group to generate the necessary pullout resistance.…”

Heli̇sel Ankraj Plakalarinin Tabakali Zemi̇nlerdeki̇ Çekme Kapasi̇teleri̇ni̇n İncelenmesi̇

“…Stewart (1985), tabakalı zeminde (kil-kum) dairesel ankraj plakalarının çekme kapasitelerini farklı koşullarda model deneylerle araştırmıştır. Patra ve diğ.…”

“…Literatürde, homojen zeminlere gömülü ankraj plakalarının çekme davranışları üzerine nümerik ve deneysel çalışmaların oldukça fazla olduğu, buna karşın tabakalı zeminlere gömülü temellerin çekme davranışlarının yeterince incelenmediği görülmektedir. Stewart (1985), tabakalı zeminde (kil-kum) dairesel ankraj plakalarının çekme kapasitelerini farklı koşullarda model deneylerle araştırmıştır. Patra ve diğ.…”