The effect of thermal–hydro–mechanical coupling on grouting in a single fracture under coal mine flowing water conditions

Abstract

Groundwater inrush is a hazard that always occurs during underground mining. Grouting is one of the most effective processes to seal underground water inflow for hazard prevention. In this study, grouting experiments are conducted by using a visualized transparent single-fracture replica with plane roughness. Image processing and analysis are performed to investigate the thermo–hydro–mechanical coupling effect on the grouting diffusion under coal mine flowing water conditions. The results show that higher ambient temperature leads to shorter initial gel time of chemical grout and leads to a better relative sealing efficiency in the case of a lower flow rate. However, with a higher water flow rate, the relative sealing efficiency is gradually reduced under higher temperature conditions. The grouting pressure, the seepage pressure, and the temperature are measured. The results reveal that the seepage pressure shows a positive correlation with the grouting pressure, while the temperature change shows a negative correlation with the seepage pressure and the grouting pressure. The “equivalent grouting point offset” effect of grouting shows an eccentric elliptical diffusion with larger grouting distance and width under lower temperature conditions.

Keywords

a single-fracture replica / dynamic water flow / grout diffusion / sealing efficiency / water inrush

References

[1] Birkholzer JT, Bond AE, Hudson JA, et al. DECOVALEX-2015: an international collaboration for advancing the understanding and modeling of coupled thermo-hydro-mechanical-chemical (THMC) processes in geological systems. Environ Earth Sci. 2018; 77(14): 539.

[2] Dallyn P, El-Hamalawi A, Palmeri A, Knight R. Experimental testing of grouted connections for offshore substructures: a critical review. Structures. 2015; 3: 90-108.

[3] Dallyn P, El-Hamalawi A, Palmeri A, Knight R. Experimental investigation on the development of wear in grouted connections for offshore wind turbine generators. Eng Struct. 2016; 113: 89-102.

[4] Dallyn P, El-Hamalawi A, Palmeri A, Knight R. Prediction of wear in grouted connections for offshore wind turbine generation. Structure. 2017; 10: 117-129.

[5] Deng X, Li Y, Wang F, et al. Experimental study on the mechanical properties and consolidation mechanism of microbial grouted backfill. Int J Min Sci Technol. 2022; 32(2): 271-282.

[6] Ding W, Duan C, Zhu Y, Zhao T, Huang D, Li P. The behavior of synchronous grouting in a quasi-rectangular shield tunnel based on a large visualized model test. Tunnel Undergr Space Technol. 2019; 83: 409-424.

[7] Eriksson M. Prediction of Grout Spread and Sealing Effect: A Probabilistic Approach. UMI Dissertations Publishing; 2002.

[8] Fransson Å, Funehag J, Thörn J. Swedish grouting design: hydraulic testing and grout selection. Proc Inst Civil Eng Ground Improv. 2016; 169: 275-285.

[9] Funehag J, Thorn J. Radial penetration of cementitious grout—Laboratory verification of grout spread in a fracture model. Tunnel Undergr Space Technol. 2018; 72: 228-232.

[10] Gothäll R, Stille H. Fracture dilation during grouting. Tunnel Undergr Space Technol. 2009; 24(2): 126-135.

[11] Gustafson G, Claesson J, Fransson A. Steering parameters for rock grouting. J Appl Math. 2013; 2013:269594.

[12] Hao M, Wang F, Li X, Zhang B, Zhong Y. Numerical and experimental studies of diffusion law of grouting with expansible polymer. J Mater Civ Eng. 2018; 30(2):04017290.

[13] Islam S, Williams DJ, Llano-Serna M, Zhang C. Settling, consolidation and shear strength behaviour of coal tailings slurry. Int J Min Sci Technol. 2020; 30(6): 849-857.

[14] Jin L, Sui W, Xiong J. Experimental investigation on chemical grouting in a permeated fracture replica with different roughness. Appl Sci. 2019; 9:2762.

[15] Kim S, Hosseini SA. Hydro-thermo-mechanical analysis during injection of cold fluid into a geologic formation. Int J Rock Mech Min Sci2015; 77: 220-236.

[16] Kleinlugtenbelt R, Bezuijen A, van Tol AF. Model tests on compensation grouting. Tunnel Undergr Space Technol. 2006; 21: 435-436.

[17] Li M, Wu Z, Weng L, Ji J, Liu Q. Numerical investigation of coupled effects of temperature and confining pressure on rock mechanical properties in fractured rock mass using thermal-stress-aperture coupled model. Int J Geomech. 2021; 21(10):04021195.

[18] Li S, Liu R, Zhang Q, Zhang X. Protection against water or mud inrush in tunnels by grouting: a review. J Rock Mech Geotech Eng. 2016; 8: 753-766.

[19] Liang Y, Sui W, Qi J. Experimental investigation on chemical grouting of inclined fracture to control sand and water flow. Tunnel Undergr Space Technol. 2019; 83: 82-90.

[20] Liu R, Li X, Li S, et al. Rheology of cement-sodium silicate grout containing bentonite and cellulose ether at high temperatures. Adv Cem Res. 2023; 35(11): 515-527.

[21] Lombardi G. Grouting of rock masses. Grouting. 2003; 2023: 164-197.

[22] Mao D, Lu M, Zhao Z, Ng M. Effects of water related factors on pre-grouting in hard rock tunnelling. Procedia Eng. 2016; 165: 300-307.

[23] Murdoch L. A field test of hydraulic fracturing in glacial till. In: Proc 15th Annual USEPA Research Symposium, Cincinnati. US Environmental Protection Agency/600/9-90/006; 1990: 164-174.

[24] Northrop D, Warpinski N, Schmidt R, Smith C. Stimulation and mine back experiment project: the direct observation of hydraulic and explosive fracturing tests. In: Proc Symp Enhanced Oil & Gas Recovery & Improved Drilling Methods, Tulsa, Sandia Labs., Albuquerque, NM (USA).1978: 1-14.

[25] Sui W, Liu J, Hu W, Qi J, Zhan K. Experimental investigation on sealing efficiency of chemical grouting in rock fracture with flowing water. Tunnel Undergr Space Technol. 2015; 50: 239-249.

[26] Wang Q, Zhu Q, Shao T, et al. The rheological test and application research of glass fiber cement slurry based on plugging mechanism of dynamic water grouting. Constr Build Mater2018; 189: 119-130.

[27] Wang YH, Yang P, Li ZT, Wu SJ, Zhao ZX. Experimental-numerical investigation on grout diffusion and washout in rough rock fractures under flowing water. Comput Geotech. 2020; 126:103717.

[28] Warninski N. Investigation of the accuracy and reliability of in-situ stress measurements using hydraulic fracturing in perforated cased holes. In: Proceedings of the 24th US Symposium on Rock Mechanics, Golden, College Station, Texas.1983: 773-786.

[29] Yang P, Liu Y, Gao S, Xue S. Experimental investigation on the diffusion of carbon fibre composite grouts in rough fractures with flowing water. Tunnel Undergr Space Technol. 2020; 95:103146.

[30] Zhan K, Su W, Gao Y. A model for grouting into single fracture with flowing water. Rock Soil Mech. 2011; 32(6): 1659-1663.

[31] Zhan SS, Wang TT, Jeng FS. Fracture characterization using hydrogeological approaches and measures taken for groundwater inrush mitigation in shaft excavation. Tunnel Undergr Space Technol. 2018; 82: 554-567.

[32] Zhang D, Fang Q, Lou H. Grouting techniques for the unfavorable geological conditions of Xiang'an subsea tunnel in China. J Rock Mech Geotech Eng. 2014; 6: 438-446.

[33] Zhang D, Sui W, Liu J. Investigation on the influence of temperature and confining pressure on the hydraulic conductivity of the integrated and fractured Jurassic Conglomerates. Geofluids. 2021; 2021: 1-13.

[34] Zhang GL. Mechanism of deflection propagation for grouting in fractured rock mass with flowing water and mining effect on grouted curtain: a review and prospect. J Eng Geol. 2022; 30(3): 987-997.

[35] Zheng G, Sui W, Zhang G, Chen J, Zhang D. Propagation and sealing efficiency of chemical grouting in a two-dimensional fracture network with flowing water. Int J Min Sci Technol. 2023; 33: 903-917.

[36] Zhou L, Su K, Wu H, Shi C. Numerical investigation of grouting rock mass with fracture propagation using cohesive finite elements. Int J Geomech. 2018; 18(7):04018075.

[37] Zou L, Håkansson U, Cvetkovic V. Two-phase cement grout propagation in homogeneous water-saturated rock fractures. Int J Rock Mech Min Sci. 2018; 106: 243-249.

RIGHTS & PERMISSIONS

2025 The Author(s). Deep Underground Science and Engineering published by John Wiley & Sons Australia, Ltd on behalf of China University of Mining and Technology.