Abstract
In this research, the rockbolt mechanism of a jointed rock mass under uniaxial tension was systematically revealed with a laboratory test and a numerical simulation. It was found that the rockbolt rock mass experienced five stages under uniaxial tension, the densification stage, elastic stage, plastic deformation stage, progressive debonding stage, and complete debonding stage. The stress-strain curve and ultimate tensile strength of a rockbolt rock mass were analyzed by taking the rockbolt spacing and rockbolt angle as variables. It was found that the improvement effect of the reduction of the rockbolt spacing on the ultimate tensile strength was limited. When the rockbolt spacing was reduced to a certain limit, the stress concentration area between adjacent rockbolts was connected and destroyed, resulting in the increase of the rockbolt rock strength becoming smaller, and even having a downward trend. The increase of the rockbolt angle led to the change of the stress mode and failure mode of the whole structure, and the ultimate tensile strength first increased and then decreased. The optimal rockbolt angle was between 60° and 70°. It is worth noting that there was an obvious mechanical occlusion between the thread on the rockbolt surface and the rock mass, resulting in the multi-stage step-down characteristic of the stress-strain curve in the complete debonding stage. The results of this study can provide a reference for the design and construction of similar projects.
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References
Craig P, Lamei RH, Chen H, Vandermaat D, Crosky A, Hagan P, Hebblewhite B, Saydam S (2021) Stress corrosion cracking of rockbolts: An in-situ testing approach. Construction and Building Materials 269, DOI: https://doi.org/10.1016/j.conbuildmat.2020.121275
Cai H, Lu A, Ma Y (2020) An analytical solution for shallow buried tunnel reinforced by point anchored rockbolts. Tunnelling and Underground Space Technology 100:103402, DOI: https://doi.org/10.1016/j.tust.2020.103402
Chang X, Wang G, Liang Z, Yang J, Tang C (2017) Study on grout cracking and interface debonding of rockbolt grouted system. Construction and Building Materials 135:665–673, DOI: https://doi.org/10.1016/j.conbuildmat.2017.01.031
Ding P, Tao L, Yang X, Zhao J, Shi C (2019) Three-dimensional dynamic response analysis of a single-ring structure in a prefabricated subway station. Sustainable Cities and Society 45:271–286, DOI: https://doi.org/10.1016/j.scs.2018.11.010
Ding P, Shi C, Tao L, Liu Z, Zhang T (2023) Research on seismic analysis methods of large and complex underground pipe structures in hard rock sites. Tunnelling and Underground Space Technology Incorporating Trenchless Technology Research 135:105035, DOI: https://doi.org/10.1016/j.tust.2023.105035
Fan H, Li L, Chen G, Liu H, Gao J, Li C, Peng X, Zhou S (2023a) Analysis method of the water inrush and collapse in jointed rock mass tunnels: A case study. Engineering Analysis with Boundary Elements 146:838–850, DOI: https://doi.org/10.1016/j.enganabound.2022.11.030
Fan H, Li L, Chen G, Liu H, Ji X, Jiang X, Zhou S (2023b) An improved 3D DDA method considering the unloading effect of tunnel excavation and its application. Computers and Geotechnics 154:105178, DOI: https://doi.org/10.1016/j.compgeo.2022.105178
Fan H, Li L, Liu H, Ni J, Cheng S, Zhou H (2022) Parametric research on the time step and spring stiffness in three-dimensional discontinuous deformation analysis method. International Journal for Numerical and Analytical Methods in Geomechanics 46(13):2603–2619, DOI: https://doi.org/10.1002/nag.3420
Fan H, Li L, Liu H, Shi H, Hu J, Zhou S (2021) Advanced stability analysis of the tunnels in jointed rock mass based on TSP and DEM. KSCE Journal of Civil Engineering 25:1491–1503, DOI: https://doi.org/10.1007/s12205-021-0170-2
Fan H, Li L, Zong P, Liu H, Yang L, Wang J, Yan P, Sun S (2023c) Advanced stability analysis method for the tunnel face in jointed rock mass based on DFN-DEM. Underground Space 13:136–149, DOI: https://doi.org/10.1016/j.undsp.2023.03.009
Ho DA, Bost M, Rajot JP (2019) Numerical study of the bolt-grout interface for fully grouted rockbolt under different confining conditions. International Journal of Rock Mechanics and Mining Sciences 119:168–179, DOI: https://doi.org/10.1016/j.ijrmms.2019.04.017
Jing H, Yang S, Zhang M, Xu G, Chen K (2014) An experimental study on anchorage strength and deformation behavior of large-scale jointed rock mass. Tunnelling and Underground Space Technology 43:184–197, DOI: https://doi.org/10.1016/j.tust.2014.05.006
Li X, Aziz N, Mirzaghorbanali A, Nemcik J (2016a) Behavior of fiber glass bolts, rock bolts and cable bolts in shear. Rock Mechanics and Rock Engineering 49(7):2723–2735, DOI: https://doi.org/10.1007/s00603-015-0907-7
Li L, Fan H, Liu H, Li S, Cheng S, Zhang Q, Tu W, Zhou S (2023) Model test and numerical simulation research on the mechanical response law of lager span and small interval tunnels constructed by CD method. Tunnelling and Underground Space Technology 132:104947, DOI: https://doi.org/10.1016/j.tust.2022.104947
Li L, Hagan PC, Saydam S, Hebblewhite B, Li Y (2016b) Parametric study of rockbolt shear behaviour by double shear test. Rock Mechanics and Rock Engineering 49:4787–4797, DOI: https://doi.org/10.1007/s00603-016-1063-4
Li L, Hu J, Li S, Qin C, Liu H, Chen D, Wang J (2021) Development of a novel triaxial rock testing method based on biaxial test apparatus and its application. Rock Mechanics and Rock Engineering 54:1597–1607, DOI: https://doi.org/10.1007/s00603-020-02329-3
Liu H, Yang G, Guo Y, Zhang Q, Sun Z (2023) Experimental study on the shear deformation characteristics and mechanical properties of bolted joints. International Journal of Geomechanics 23(1):04022265, DOI: https://doi.org/10.1061/(ASCE)GM.1943-5622.0002641
Li Y, Zhou H, Zhang L, Zhu W, Li S, Liu J (2016c) Experimental and numerical investigations on mechanical property and reinforcement effect of bolted jointed rock mass. Construction and Building Materials 126:843–856, DOI: https://doi.org/10.1016/j.conbuildmat.2016.09.100
Ma S, Zhu X, Qin W, Hu S (2018) Determination of the bond–slip relationship of fully grouted rockbolts. Environmental Earth Sciences 77, DOI: https://doi.org/10.1007/s12665-018-7495-2
Nie W, Zhao ZY, Guo W, Shang J, Wu C (2019) Bond-slip modeling of a CMC rockbolt element using 2D-DDA method. Tunnelling and Underground Space Technology 85:340–353, DOI: https://doi.org/10.1016/j.tust.2018.12.025
Sharifzadeh M, Lou J, Crompton B (2020) Dynamic performance of energy-absorbing rockbolts based on laboratory test results. Part II: Role of inherent features on dynamic performance of rockbolts. Tunnelling and Underground Space Technology 105, DOI: https://doi.org/10.1016/j.tust.2020.103555
Saadat M, Taheri A (2020) Effect of contributing parameters on the behaviour of a bolted rock joint subjected to combined pull-and-shear loading: A DEM approach. Rock Mechanics and Rock Engineering 53(1):383–409, DOI: https://doi.org/10.1007/s00603-019-01921-6
Tao L, Ding P, Lin H, Wang H, Kou W, Shi C, Li S, Wu S (2021) Three-dimensional seismic performance analysis of large and complex underground pipe trench structure. Soil Dynamics and Earthquake Engineering 150:106904, DOI: https://doi.org/10.1016/j.soildyn.2021.106904
Tao L, Ding P, Shi C, Wu X, Wu S, Li S (2019) Shaking table test on seismic response characteristics of prefabricated subway station structure. Tunnelling and Underground Space Technology 92:102994, DOI: https://doi.org/10.1016/j.tust.2019.102994
Tao L, Ding P, Yang X, Lin P, Shi C, Bao Y, Wei P, Zhao J (2020) Comparative study of the seismic performance of prefabricated and cast-in-place subway station structures by shaking table test. Tunnelling and Underground Space Technology 105:103583, DOI: https://doi.org/10.1016/j.tust.2020.103583
Tao L, Shi C, Ding P, Y X, Bao Y, Wang Z (2022) Shaking table test of the effect of an enclosure structure on the seismic performance of a prefabricated subway station. Tunnelling and Underground Space Technology Incorporating Trenchless Technology Research 125:124533, DOI: https://doi.org/10.1016/j.tust.2022.104533
Tap L, Shi C, Ding P, Li S, Wu S, Bao Y (2022) A study on bearing characteristic and failure mechanism of thin-walled structure of a prefabricated subway station. Frontiers of Structural and Civil Engineering 16:359–377, DOI: https://doi.org/10.1007/s11709-022-0816-2
Tang B, Yeboah M, Cheng H, Tang Y, Yao Z, Wang C, Rong C, Wang Z, Liu Q (2021) Numerical study and field performance of rockbolt support schemes in TBM-excavated coal mine roadways: A case study. Tunnelling and Underground Space Technology 115, DOI: https://doi.org/10.1016/j.tust.2021.104053
Teymen A, Kılıç A (2018) Effect of grout strength on the stress distribution (tensile) of fully-grouted rockbolts. Tunnelling and Underground Space Technology 77:280–287, DOI: https://doi.org/10.1016/j.tust.2018.04.022
Vandermaat D, Saydam S, Hagan PC, Crosky AG (2016) Examination of rockbolt stress corrosion cracking utilising full size rockbolts in a controlled mine environment. International Journal of Rock Mechanics and Mining Sciences 81:86–95, DOI: https://doi.org/10.1016/j.ijrmms.2015.11.007
Wu X, Jiang Y, Li B (2018) Influence of joint roughness on the shear behaviour of fully encapsulated rock bolt. Rock Mechanics and Rock Engineering 51(3):953–959, DOI: https://doi.org/10.1007/s00603-017-1365-1
Xu C, Li Z, Wang S, Wang S, Fu L, Tang C (2017) Pullout performances of grouted rockbolt systems with bond defects. Rock Mechanics and Rock Engineering 51:861–871, DOI: https://doi.org/10.1007/s00603-017-1373-1
Yan S, Song Y, Bai J, Elmo D (2018) A study on the failure of resin end-anchored rockbolts subjected to tensile load. Rock Mechanics and Rock Engineering 52:1917–1930, DOI: https://doi.org/10.1007/s00603-018-1663-2
Yu S, Zhu W, Niu L (2022) Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull-out loading. International Journal of Coal Science & Technology 9, DOI: https://doi.org/10.1007/s40789-022-00482-4
Yu S, Zhu W, Niu L, Zhou S, Kang P (2019) Experimental and numerical analysis of fully grouted long rockbolt load-transfer behavior. Tunnelling and Underground Space Technology 85:56–66, DOI: https://doi.org/10.1016/j.tust.2018.12.001
Zhang M, Han J, Cao C, Ma S (2021) Experimental study on anchorage performance of rockbolts by adding steel aggregates into resin anchoring agents. PLoS One 16:e0255046, DOI: https://doi.org/10.1371/journal.pone.0255046
Acknowledgments
This work was supported by the National Natural Science Foundation of China [52109127]; and the Joint Funds of the National Natural Science Foundation of China [U1934218]; and the Joint Funds of the National Natural Science Foundation of China [52021005]. We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.
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Zhou, S., Ji, X., Li, L. et al. The Mechanism of Rockbolts in Jointed Rock under Uniaxial Tension. KSCE J Civ Eng 27, 4938–4947 (2023). https://doi.org/10.1007/s12205-023-0926-y
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DOI: https://doi.org/10.1007/s12205-023-0926-y