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| A comparative study on rock breaking by a disc cutter under abrasive water jet-assisted and conventional working conditions |
| ZHANG Jinliang1, 2, LUO Xingchen3, YANG Fengwei1, 2, FU Jie4, XIA Yimin3, LUO Nanchuan3 |
1.Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, China;
2.Key Laboratory of Water Management and Water Security for Yellow River Basin, Ministry of Water Resources (Under Construction), Zhengzhou 450003, China; 3.College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
4.College of Materials Science and Engineering, Central South University, Changsha 410083, China |
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Abstract To compare the rock-breaking characteristics of disc cutter under abrasive water jet-assisted and conventional working conditions, rock-breaking experiments under two working conditions were carried out. The differences in the rock-breaking state, disc cutter load, and rock-breaking efficiency were compared and analysed. The results show that compared with conventional rock-breaking of disc cutter, the rock-breaking of disc cutter under abrasive water jet-assisted can improve the ability of disc cutter to penetrate the hard rock, promote the expansion of cracks inside the rock interior, thereby generating large-size rock chip. The vertical and rolling force of the disc cutter under abrasive water jet-assisted is significantly lower than that of the conventional disc cutter rock breaking, with an average decrease of 39% and 25%. In addition, the amount of rock-breaking by disc cutter under abrasive water jet-assisted increases, and the rock-breaking efficiency is further improved, which is 1-2 times that of conventional rock-breaking of disc cutter. The research results provide a reference for improving the rock-breaking performance of disc cutters under hard rock geological conditions and efficient excavation of TBM.
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Received: 15 March 2022
Published: 28 June 2023
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