Experimental study on the performance of abrasive water jet cutting rebars and concrete materials in submerged environments
Xinjie Huang,Shangrong Song,Mengmeng Hu,Yanzhao Feng,Biao Li,Bo Zhang,Bin Xu,Senlin Yang
Abstract
Abrasive water jet (AWJ) cutting technology is considered an effective method to assist shield tunnels in crossing reinforced concrete obstacles. In this study, experiments using AWJ to cut rebars and concrete under submerged conditions were conducted. The results showed that under submerged conditions the AWJ cutting depth of the concrete was much greater than that of the rebars. The efficient cutting parameters were as follows: a traverse speed of less than 2 m/min, standoff distance of less than 5 cm, and abrasive flow rate of 1100 g/min. The damage modes at the top, middle, and bottom of the rebars were primarily deformation wear, shear wear, and a mixture of deformation and shear wear, respectively. The order of importance of the influence of the submerged AWJ cutting parameters on the cutting depth of the rebars was as follows: the traverse speed, standoff distance, nozzle diameter, pump pressure, and abrasive flow rate. A prediction model for the cutting depth of the rebars was established, with an average absolute percentage error of about 15%. On this basis, suggestions that can provide guidance for practical engineering applications of effective AWJ-assisted cutting of reinforced concrete in shield tunneling projects are given.
Xinjie Huang — State Key Laboratory of Tunnel Engineering, Shandong University, Jinan 250061, Shandong, China; Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, Shandong, China
Shangrong Song, Yanzhao Feng — Sinohydro Bureau 6 Co., Ltd., Shenyang 110179, Liaoning, China Mengmeng Hu.
Biao Li, Bin Xu, Senlin Yang — State Key Laboratory of Tunnel Engineering, Shandong University, Jinan 250061, Shandong, China; Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, Shandong, China
Bo Zhang — State Key Laboratory of Tunnel Engineering, Shandong University, Jinan 250061, Shandong, China; School of Future Technology, Shandong University, Jinan 250061, Shandong, China
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