Field and laboratory experimental studies on hard-rock tunnel excavation based on disc cutter coupled with high-pressure waterjet

Abstract

The tunnel boring machine (TBM) is typically used in hard-rock tunnel excavation. Owing to the unsatisfactory adaptability of TBM to the surrounding rock, when crossing high-strength and high-wear strata, the TBM can easily cause defects, such as abnormal wear on cutters and overload damage to bearings, thus affecting the construction efficiency and cost. Therefore, high-pressure waterjet technology should be applied to assist in rock breaking for efficient TBM tunneling. In this study, the effects of water pressure, nozzle diameter, and nozzle speed on cutting are investigated via laboratory experiments of cutting hard rock using high-pressure waterjets. The penetration performance of the TBM under different water pressures is investigated via a field industrial penetration test. The results show that high-pressure waterjets are highly efficient for rock breaking and are suitable for industrial applications, as they can accommodate the advancing speed of the TBM and achieve high-efficiency rock breaking. However, during the operation of high-pressure waterjets, the ambient temperature and waterjet temperature in the tunnel increase significantly, which weakens the cooling effect of the cutterhead and decreases the construction efficiency of the TBM. Therefore, temperature control and cooling measures for high-pressure waterjets during their long-term operation must be identified. This study provides a useful reference for the design and construction of high-pressure water-jet-assisted cutterheads for breaking road headers.

Graphical abstract

Keywords

tunnel boring machine / hard-rock cutting / free face / disc cutter / rock-cutting efficiency

References

[1] Farrokh E, Rostami J, Laughton C. Study of various models for estimation of penetration rate of hard rock TBMs. Tunnelling and Underground Space Technology, 2012, 30: 110–123

[2] Farrokh E, Kim D Y. A discussion on hard rock TBM cutter wear and cutterhead intervention interval length evaluation. Tunnelling and Underground Space Technology, 2018, 81(11): 336–357

[3] Rostami J. Study of pressure distribution within the crushed zone in the contact area between rock and disc cutters. International Journal of Rock Mechanics and Mining Sciences, 2013, 57: 172–186

[4] Wang L, Kang Y, Zhao X, Zhang Q. Disc cutter wear prediction for a hard rock TBM cutterhead based on energy analysis. Tunnelling and Underground Space Technology, 2015, 50(8): 324–333

[5] Yagiz S. Utilizing rock mass properties for predicting TBM performance in hard rock condition. Tunnelling and Underground Space Technology, 2008, 23(3): 326–339

[6] Zhang J L, Gao Y M, Liu X, Zhang Z A, Yuan Y, Mang H A. Tunnelling and underground space technology incorporating trenchless technology research—Invited editorial. Tunnelling and Underground Space Technology, 2022, 128: 104605

[7] Liu Q S, Pan Y C, Liu J P, Kong X X, Shi K. Comparison and discussion on fragmentation behavior of soft rock in multi-indentation tests by a single TBM disc cutter. Tunnelling and Underground Space Technology, 2016, 57(8): 151–161

[8] Liu S, Chen J, Liu X. Rock breaking by conical pick assisted with high pressure water jet. Advances in Mechanical Engineering, 2014, 6(1): 868041

[9] Rui F, Zhao G. Experimental and numerical investigation of laser-induced rock damage and the implications for laser-assisted rock cutting. International Journal of Rock Mechanics and Mining Sciences, 2021, 139(3): 104653

[10] Zhang S, Huang Z, Wang H, Li G, Hong C. Experimental study on the rock-breaking characteristics of abrasive liquid nitrogen jet for hot dry rock. Journal of Petroleum Science Engineering, 2019, 181(10): 106166

[11] Samir M D, Rafezi H, Hassani F, Kermani M, Sasmito A P. Experimental investigation on the effects of microwave irradiation on kimberlite and granite rocks. Journal of Rock Mechanics and Geotechnical Engineering, 2020, 13(2): 267–274

[12] Qin L, Dai J, Teng P. Study on the effect of microwave irradiation on rock strength. Journal of Engineering Science and Technology Review, 2015, 8(4): 91–96

[13] BilginNCopurHBalciC. Mechanical Excavation in Mining and Civil Industries. Boca Raton: CRC, 2013, 1–10

[14] Zeng J, Kim T J. An erosion model of polycrystalline ceramics in abrasive waterjet cutting. Wear, 1996, 193(2): 207–217

[15] Cheng J L, Jiang Z H, Han W F, Li M L, Wang Y X. Breakage mechanism of hard-rock penetration by TBM disc cutter after high pressure water jet precutting. Engineering Fracture Mechanics, 2020, 240: 107320

[16] Ciccu R, Grosso B. Improvement of disc cutter performance by water jet assistance. Rock Mechanics and Rock Engineering, 2014, 47(2): 733–744

[17] Fenn O. The use of water jets to assist free-rolling cutters in the excavation of hard rock. Tunnelling and Underground Space Technology, 1989, 4(3): 409–417

[18] Khair A W, Achanti V B. Current trends in water jet assisted cutting applications to geotechnical industry in USA. Review of High Pressure Science and Technology, 1998, 7: 1459–1465

[19] Sult D B, Schwoebel J J. US Patent, 6755480, 2004-06-29

[20] Fair J C. Development of high-pressure abrasive-jet drilling. Journal of Petroleum Technology, 1981, 33(8): 1379–1388

[21] KinoshitaT. Effect of High Speed Water Jet Stream on Rock Breaking: Potential Application in Tunneling Operation (2nd Report). Quarterly Report of Rtri, 1973, 14

[22] KnickmeyerWBaumannL. High-pressure water jet-assisted tunneling techniques. In: Proceedings of the 2nd US Water Jet Conference. Rolla Missouri, 1983, 346–356

[23] SongK ZYuanDWangM. Study review on the interaction between disk cutter and rock. Journal of Railway Engineering Socirty, 2005, (6): 66−69 (in Chinese)

[24] Yin L J, Gong Q M, Ma H S, Zhao J, Zhao X B. Use of indentation tests to study the influence of confining stress on rock fragmentation by a TBM cutter. International Journal of Rock Mechanics and Mining Sciences, 2014, 72(12): 261–276

[25] Moon T, Oh J. A study of optimal rock-cutting conditions for hard rock TBM using the discrete element method. Rock Mechanics and Rock Engineering, 2011, 45(5): 837–849

[26] Zhang X P, Ji P Q, Liu Q S, Liu Q, Zhang Q, Peng Z H. Physical and numerical studies of rock fragmentation subject to wedge cutter indentation in the mixed ground. Tunnelling and Underground Space Technology, 2018, 71: 354–365

[27] Bejari H, Hamidi J K. Simultaneous effects of joint spacing and orientation on TBM cutting efficiency in jointed rock masses. Rock Mechanics and Rock Engineering, 2013, 46(4): 897–907

[28] Li X F, Li H B, Liu Y Q, Zhou Q C, Xia X. Numerical simulation of rock fragmentation mechanisms subject to wedge penetration for TBMs. Tunnelling and Underground Space Technology, 2016, 53: 96–108

[29] Gong Q M, Jiao Y Y, Zhao J. Numerical modelling of the effects of joint spacing on rock fragmentation by TBM cutters. Tunnelling and Underground Space Technology, 2006, 21(1): 46–55

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