Analytical Study on the Effect of Geometry of Umbrella Anchors in Clays

DOI

10.2991/978-94-6463-398-6_38How to use a DOI?

Keywords

umbrella anchor; clay; geometric size; anchoring characteristics; progressive failure

Abstract

Umbrella anchor has large anchoring force and high timeliness, which is an effective technical measure for rapid reinforcement of soil engineering. However, the influence of anchor plate geometry on its anchoring characteristics is not clear. Therefore, indoor pull-out model tests of rectangular anchor plates with different geometric sizes were carried out, and the variation law of pull-out load with displacement in 95% compacted clay was tested. The influence of anchor plate geometric size on anchorage characteristics was calculated and analyzed by Plaxis finite element software. The results show that the bearing capacity experiences the compaction growth stage, the shear failure growth stage and the shear residual attenuation stage with the increase of displacement. The maximum bearing capacity increases with the increase of anchor plate area, but the bearing capacity per unit area decreases with the increase of area, and the larger the buried depth, the greater the attenuation. During the uplift process, the soil around the anchor plate shows a gradual failure process, and the fracture surface continues to extend until it penetrates. Under the condition of shallow burial (buried depth ratio = 2), the fracture surface is generated from the outer edge of the upper part of the plate, and develops upwards and outwards until the soil surface. Under the condition of deep burial (buried depth ratio = 8), the fracture surface develops directly above the plate, forming an annular fracture surface inside the soil. The change of the length-width ratio of the anchor plate changes the development process of progressive failure. With the increase of the long side of the anchor plate with the same width, the failure form of the soil around the anchor at the same buried depth is more shallow. This phenomenon makes the bearing capacity of the anchor plate per unit area decrease with the increase of the area. The research results are reliable, which provides theoretical support for the further popularization and application of umbrella anchor.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Download article (PDF)

TY  - CONF
AU  - Shutao Zhang
AU  - Jun Peng
AU  - Yong Dai
AU  - Hongyang Huang
AU  - Tingting Li
PY  - 2024
DA  - 2024/04/24
TI  - Analytical Study on the Effect of Geometry of Umbrella Anchors in Clays
BT  - Proceedings of the 2023 5th International Conference on Hydraulic, Civil and Construction Engineering (HCCE 2023)
PB  - Atlantis Press
SP  - 393
EP  - 412
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-398-6_38
DO  - 10.2991/978-94-6463-398-6_38
ID  - Zhang2024
ER  -