In situ experimental study on TBM excavation with high-pressure water-jet-assisted rock breaking

Abstract

China’s first high-pressure hydraulically coupled rock-breaking tunnel boring machine (TBM) was designed to overcome the rock breaking problems of TBM in super-hard rock geology, where high-pressure water jet system is configured, including high-flow pump sets, high-pressure rotary joint and high-pressure water jet injection device. In order to investigate the rock breaking performance of high-pressure water-jet-assisted TBM, in situ excavation tests were carried out at the Wan’anxi Water Diversion Project in Longyan, Fujian Province, China, under different water jet pressure and rotational speed. The rock-breaking performance of TBM was analyzed including penetration, cutterhead load, advance rate and field penetration index. The test results show that the adoption of high-pressure water-jet-assisted rock breaking technology can improve the boreability of rock mass, where the TBM penetration increases by 64% under the water jet pressure of 270 MPa. In addition, with the increase of the water jet pressure, the TBM penetration increases and the field penetration index decreases. The auxiliary rock-breaking effect of high-pressure water jet decreases with the increase of cutterhead rotational speed. In the case of the in situ tunneling test parameters of this study, the advance rate is the maximum when the pressure of the high-pressure water jet is 270 MPa and the cutterhead rotational speed is 6 r/min. The technical superiority of high-pressure water-jet-assisted rock breaking technology is highlighted and it provides guidance for the excavation parameter selection of high-pressure hydraulically coupled rock-breaking TBM.

Keywords

tunnel boring machine / high-pressure water jet / penetration / advance rate / field penetration index

References

[1] ZhuH-H, YanJ-X, LiangW-H. Challenges and development prospects of ultra-long and ultra-deep mountain tunnels [J]. Engineering, 2019, 5(3): 384-392

[2] HuoJ-Z, SunX-L, LiG-Q, et al. . Multi-degree-of-freedom coupling dynamic characteristic of TBM disc cutter under shock excitation [J]. Journal of Central South University, 2015, 22(9): 3326-3337

[3] SunH-Y, GuoW, LiuJ-Q, et al. . Layout design for disc cutters based on analysis of TBM cutter-head structure [J]. Journal of Central South University, 2018, 25(4): 812-830

[4] GongQ-M, YinL-J, MaH-S, et al. . TBM tunnelling under adverse geological conditions: An overview [J]. Tunnelling and Underground Space Technology, 2016, 57: 4-17

[5] ZhengY-L, HeL. TBM tunneling in extremely hard and abrasive rocks: Problems, solutions and assisting methods [J]. Journal of Central South University, 2021, 28(2): 454-480

[6] LuG-M, LiY-H, HassaniF, et al. . Review of theoretical and experimental studies on mechanical rock fragmentation using microwave-assisted approach [J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1497-1506

[7] JIN Xue-meng, HUANG Yu-yuan, YUAN Zhong-tao, et al. Research progress and application prospects of new methods for efficient rock breaking [J]. Petrochemical Industry Application, 2019(5): 1–6. (in Chinese)

[8] LeiG-Y, DangF-N, LiQ, et al. . Study on the rock damage fracture effect based on the high pressure water jet rock breaking [J]. Chinese Journal of Underground Space and Engineering, 2015, 11(1): 34-38

[9] HuangF, LuY-Y, LiuX-C, et al. . Breakage mechanism of transverse isotropic rock subjected to high-pressure water jet [J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(7): 1329-1335

[10] LiaoH-L. Integrating straight & swirling jets bit design and its rock breaking characteristics for radial horizontal hole drilling [J]. Journal of China Coal Society, 2013, 28(3): 424-429

[11] ZhouQ-L, LiN, ChenX, et al. . Analysis of water drop erosion on turbine blades based on a nonlinear liquid-solid impact model [J]. International Journal of Impact Engineering, 2009, 36(9): 1156-1171

[12] LuY-Y, TangJ-R, GeZ-L, et al. . Hard rock drilling technique with abrasive water jet assistance [J]. International Journal of Rock Mechanics and Mining Sciences, 2013, 60: 47-56

[13] HuangF, LuY-Y, LiS-Q, et al. . Influence of velocity of high-pressure water jet on failure patterns of sandstone [J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(11): 2259-2265

[14] LuY-Y, ZhangS, LiuY, et al. . Analysis of stress wave effect during rock breaking by pulsed water jet [J]. Journal of Chongqing University, 2016, 49(2): 503-514

[15] LiuY, ChenC-J, LiuX-T, et al. . Mechanism on energy dissipation and release of rock breakage with high pressure water jets [J]. Journal of China Coal Society, 2017, 42(10): 2609-2615

[16] ZHANG Wen-hua, WANG Zhi-ming, YU Jun-quan, et al. Numerical simulation for combined breaking rock with high pressure water jet and mechanical bit [J]. Chinese Journal of Rock Mechanics and Engineering, 2005(23): 4373–4382. (in Chinese)

[17] LU Yi-yu, LU Chao-hui, LI Xiao-hong, et al. Mechanical analysis of water jets assisting PDC bit to cut rocks [J]. Rock and Soil Mechanics, 2008(11): 3037–3040, 3046. (in Chinese)

[18] ZengR, DuC-L, ChenR-J, et al. . Reasonable location parameters of pick and nozzle in combined cutting system [J]. Journal of Central South University, 2014, 21(3): 1067-1076

[19] CiccuR, GrossoB. Improvement of the excavation performance of PCD drag tools by water jet assistance [J]. Rock Mechanics and Rock Engineering, 2010, 43(4): 465-474

[20] CiccuR, GrossoB. Improvement of disc cutter performance by water jet assistance [J]. Rock Mechanics and Rock Engineering, 2014, 47(2): 733-744

[21] GengQ, WeiZ-Y, MengH, et al. . Free-face-assisted rock breaking method based on the multi-stage tunnel boring machine (TBM) cutterhead [J]. Rock Mechanics and Rock Engineering, 2016, 49(11): 4459-4472

[22] GengQ, LuZ-Y, ZhangZ-Y, et al. . Numerical simulation on the rock fragmentation by tunnel boring machine disc cutters assisted by pre-cut grooves [J]. Journal of Xi’an Jiaotong University, 2021, 9: 9-19

[23] XiaY M, GuoB, CongG Q, et al. . Numerical simulation of rock fragmentation induced by a single TBM disc cutter close to a side free surface [J]. International Journal of Rock Mechanics and Mining Sciences, 2017, 91: 40-48

[24] ZhangX-H, XiaY-M, TanQ, et al. . Comparison study on the rock cutting characteristics of disc cutter under free-face-assisted and conventional cutting methods [J]. KSCE Journal of Civil Engineering, 2018, 22(10): 4155-4162

[25] XuF-T, LuJ-J, ZhouH, et al. . Research on combined rock-breaking mode of pre-cutting groove and TBM mechanical cutter [J]. Rock and Soil Mechanics, 2021, 42(5): 1363-1372

[26] LiB, ZhangB, HuM-M, et al. . Full-scale linear cutting tests to study the influence of pre-groove depth on rock-cutting performance by TBM disc cutter [J]. Tunnelling and Underground Space Technology, 2022, 122104366

[27] HUO Jun-zhou, OUYANG Xiang-yu, WANG Ya-jie, et al. Analysis of influencing factors of vibration behaviors of TBM cutterhead under heavy impact loads [J]. Journal of Harbin Engineering University, 2015(4): 555–559. (in Chinese)

[28] ZhangJ-L, LiY-C, ZhangY-S, et al. . Using a high-pressure water jet-assisted tunnel boring machine to break rock [J]. Advances in Mechanical Engineering, 2020, 12(10): 168781402096229

[29] YangY-Y, LiG-S. Experiment on cutting of super-high pressure water jet [J]. Journal of China University of Petroleum (Edition of Natural Science), 2003, 27136-37

[30] LiaoH-L, LiG-S, XiongW. Development of ultra-high pressure water jet-assisted drilling technology [J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(s2): 2583-2587

[31] ChenE-Y, DengS-W, ChenF-M, et al. . Development of a novel rock strength estimation model based on TBM boring performance [J]. Journal of Shandong University (Engineering Science), 2017, 47(2): 7-13

[32] WuX-L, ZhangX-P, LiQ-S, et al. . Prediction and classification of rock mass boreability in TBM tunnel [J]. Rock and Soil Mechanics, 2020, 411721

[33] HassanpourJ, RostamiJ, ZhaoJ. A new hard rock TBM performance prediction model for project planning [J]. Tunnelling and Underground Space Technology, 2011, 26(5): 595-603