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

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.

Model Test of Stress and Displacement of Recyclable Anchor Rod Support Structure

“…Gong Xiaonan et al [15] elaborated on the commonly used recycling mechanism of recyclable anchor rods based on the application status of recyclable anchor rod technology and provided suggestions on its research and development direction. Du Chenchen et al [16] conducted a pull-out test on the new recyclable anchor rod and revealed the distribution law of the surrounding soil's tensile stress in the pulling-out process of the recyclable anchor rod. Chen Zhibo et al [17] investigated the bearing deformation characteristics of the recyclable anchor rod, suggesting that the bearing characteristics of the recyclable anchor rod were better when the horizontal dip angle of the recyclable anchor rod was between 15 • and 35 • .…”