Experimental Study of an Inflatable Recyclable Anchor

Taoli Xiao,Yunlong He

doi:10.1155/2018/6940531

Abstract

This paper describes an investigation into the performance and pullout capacity of a new inflatable anchor system embedded in deep excavation engineering. The proposed inflatable recyclable anchor system consists of a rubber pneumatic bag, movable steel plate, and force transmission bar, which can all be recycled after use. By conducting a number of field pullout tests, it is found that the pullout bearing capacity of the proposed anchor is related to the inflation pressure, the length of the rubber pneumatic bag, and the embedment depth. It is found that, with the exponential increase of inflation pressure or length of the rubber pneumatic bag, the pullout bearing capacity of the novel inflatable anchor increases exponentially. The proposed inflatable recyclable anchor can meet the bearing requirements of traditional grouted anchors. Moreover, the proposed anchor not only has better supporting effects than traditional grouted ones, but it also has the advantages of recyclability, repeated use, and rapid formation of anchorage force. It is a new green and low-carbon anchorage, so it will have good application prospects in temporary foundation pit slope engineering.

Highlights

With the development of society, human beings have increasingly developed and utilized the underground space
Based on the above considerations and the research done by Newson et al [18, 19], Liang et al [20, 21], and Cao et al [22, 23]on inflatable anchors, this study proposes a novel inflatable recyclable anchor [24]
Through a series of field tests, the pullout bearing performance of a novel inflatable anchor is studied, and the proposed anchor is further used in a temporary foundation pit supporting project to explore its pullout bearing capacity, supporting effect, and recovery performance. e main conclusions obtained are as follows: (i) Inflatable recyclable anchor rods consisting of a rubber pneumatic bag, movable steel plates, and dowel bar

Summary

Introduction

With the development of society, human beings have increasingly developed and utilized the underground space. Since TF Herbst proposed the application of recyclable anchor rods in underground engineering [11], various types of recyclable anchors have been rapidly developed. E second type is the rotary recyclable anchor proposed by Wang et al [14], Kramadzhyan et al [15], and others. The above three representative types of anchors solve the problem of anchor recovery, there are still many problems in the application of practical deep foundation pit support engineering. E pullout bearing capacity of the former inflatable anchor is provided by the friction between the rubber bladder and the soil. The pullout bearing capacity of the new type of the anchor is provided by the combination of the steel sheet and the soil. By conducting a number of field pullout tests, the characteristics of the pullout bearing capacity of the proposed anchor are investigated, and the possibility of its application in practical engineering is explored

Experimental Studies

Findings

Discussion

Conclusions