Experimental and Numerical Studies on the Inflatable Recyclable Anchor in the Tube Piece Type Based on the Soil-Anchor Interaction Mechanism

Chenchen Du,Yunlong He,Ting Xiao ,Xiaoyan Yang

doi:10.1155/2021/8866211

Chenchen Du, Yunlong He + Show 2 more

Open Access

https://doi.org/10.1155/2021/8866211

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Abstract

This paper deeply studies the characteristics and “uplift bearing capacity” of a novel type of inflatable recyclable anchor in the tube piece. The proposed novel inflatable recyclable anchor in the tube piece type comprises a metallic rod, an inflatable anchorage device, and a recovery device. Fifteen field uplift tests are conducted to investigate the effects of inflation pressure, thickness of the steel disc, embedment length, and time lapse between anchor inflation and pullout on “the uplift bearing capacity.” The results show that “the uplift bearing capacity” of the novel inflatable anchor in the tube piece type increases with the increase of inflation pressure, thickness of the steel disc, and embedment length. With the increase of inflation time, “the uplift bearing capacity” of the novel inflatable anchor experiences an increase after first experiencing a decrease. The finite element analysis method is used to establish a numerical analysis model of the inflatable anchor, and the distribution law of the tensile stress of the surrounding soil during the pullout of the anchor is analysed. Compared with the traditional grouted anchor, the proposed anchor has an obvious superiority in recyclability, reusability, and swifter formation of anchorage force and thus is a resource-saving and environmentally friendly anchor technology.

Highlights

Anchor bolt technology has a wide range of applications in engineering practice [1,2,3,4,5]. e inflatable anchor is a type of head-expansion anchor, which can provide “uplift bearing capacity” by using the dilated anchor solid to squeeze the surrounding soil
In the previous research done by Xiao and He [34], the factors affecting “the uplift bearing capacity” of the inflatable anchor were concentrated on inflation pressure, embedment depth, and length of the rubber pneumatic bag, which were not comprehensive enough
In this study, based on the mechanical characteristics of the new anchor and the past research, in order to explore the consequences of inflation pressure, steel thickness, embedment depth, and time lapse between anchor inflation and pullout on “the uplift bearing capacity” of the proposed inflatable anchor, fifteen field uplift tests were conducted

Summary

Introduction

Anchor bolt technology has a wide range of applications in engineering practice [1,2,3,4,5]. e inflatable anchor is a type of head-expansion anchor, which can provide “uplift bearing capacity” by using the dilated anchor solid to squeeze the surrounding soil. Prior research [10, 12, 13] observed that the major factors determining the ultimate drawing bearing force of an inflatable anchor bolt are the inflation pressure and the size of the rubber pneumatic bag. In the previous research done by Xiao and He [34], the factors affecting “the uplift bearing capacity” of the inflatable anchor were concentrated on inflation pressure, embedment depth, and length of the rubber pneumatic bag, which were not comprehensive enough. E potential for practical applications is discussed by means of comparing with previously studied inflatable anchors and traditional grouted anchors On this basis, the stress field distribution law of the surrounding soil under the pullout of the novel anchor is analysed by using ABAQUS numerical simulation software. The anchoring mechanism of the anchor is discussed in detail

Experimental Studies

Experimental Results

Advantages of the Inflatable Recyclable Anchor in the Tube Piece Type

Numerical Simulation Research

Conclusions