Abstract
Rock bolts are widely employed as an effective and efficient reinforcement method in geotechnical engineering. Sandwich composite structures formed by hard rock and weak rock are often encountered in practical projects. Furthermore, the spatial structure of the rock mass has a direct influence on the effect of the anchorage support. To investigate the impact of rock mass structure on the mechanical characteristics of anchorage interfaces, pull-out tests on reinforced specimens with different mudstone thicknesses and fracture dip angles are conducted. The experimental results indicate that the percentage of mudstone content and fracture dip angle have a significant influence on the pullout load of the samples. A weaker surrounding rock results in a lower peak load and a longer critical anchorage length, and vice versa. The results also show that 70% mudstone content can be considered a critical condition for impacting the peak load. Specifically, the percentage of mudstone content has a limited influence on the variation in the peak load when it exceeds 70%. Optical fiber deformation results show that compared to the rock mass with fracture dip angles of 0° and 60°, the rock mass with a fracture dip angle of 30° has a more uniformly distributed force at the anchorage interface. When the fracture dip angle exceeds 60°, the dip angle is no longer a key indicator of peak load. The accuracy of the experimentally obtained load-displacement curves is further verified although numerical simulation using the discrete element method.
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References Cited
Akisanya, A. R., Ivanović, A., 2014. Debonding along the Fixed Anchor Length of a Ground Anchorage. Engineering Structures, 74: 23–31. https://doi.org/10.1016/j.engstruct.2014.05.013
Alneasan, M., Behnia, M., Bagherpour, R., 2019. Analytical Investigations of Interface Crack Growth between Two Dissimilar Rock Layers under Compression and Tension. Engineering Geology, 259: 105188. https://doi.org/10.1016/j.enggeo.2019.105188
Bobet, A., Einstein, H. H., 2011. Tunnel Reinforcement with Rockbolts. Tunnelling and Underground Space Technology, 26(1): 100–123. https://doi.org/10.1016/j.tust.2010.06.006
Chang, X., Wang, G. Z., Liang, Z. Z., et al., 2017. Study on Grout Cracking and Interface Debonding of Rockbolt Grouted System. Construction and Building Materials, 135: 665–673. https://doi.org/10.1016/jxonbuildmat.2017.01.031
Che, N., Wang, H. N., Jiang, M. J., 2020. DEM Investigation of Rock/Bolt Mechanical Behaviour in Pull-out Tests. Particuology, 52: 10–27. https://doi.org/10.1016/j.partic.2019.12.006
Chen, J. H., Yang, S. L., Zhao, H. B., et al., 2019. The Analytical Approach to Evaluate the Load-Displacement Relationship of Rock Bolts. Advances in Civil Engineering, 2019: 2678905. https://doi.org/10.1155/2019/2678905
Chen, Y. L., Teng, J. Y., Sadiq, R. A. B., et al., 2020. Experimental Study of Bolt-Anchoring Mechanism for Bedded Rock Mass. International Journal of Geomechanics, 20(4): 0402001. https://doi.org/10.1061/(asce)gm.1943-5622.0001561
Deb, D., Das, K. C., 2011. Modelling of Fully Grouted Rock Bolt Based on Enriched Finite Element Method. International Journal of Rock Mechanics and Mining Sciences, 48(2): 283–293. https://doi.org/10.1016/j.ijrmms.2010.11.015
Dong, M. L., Zhang, F. M., Hu, M. J., et al., 2020. Study on the Influence of Anchorage Angle on the Anchorage Effect of Soft-Hard Interbedded Toppling Deformed Rock Mass. KSCE Journal of Civil Engineering, 24(8): 2382–2392. https://doi.org/10.1007/s12205-020-2386-y
Iqbal, J., Dai, F. C., Hong, M., et al., 2018. Failure Mechanism and Stability Analysis of an Active Landslide in the Xiangjiaba Reservoir Area, Southwest China. Journal of Earth Science, 29(3): 646–661. https://doi.org/10.1007/s12583-017-0753-5
Jade, S., Sitharam, T. G., 2003. Characterization of Strength and Deformation of Jointed Rock Mass Based on Statistical Analysis. International Journal of Geomechanics, 3(1): 43–54. https://doi.org/10.1061/(asce)1532-3641(2003)3:1(43)
Jia, C. J., Xu, W. Y., Wang, R. B., et al., 2018. Experimental Investigation on Shear Creep Properties of Undisturbed Rock Discontinuity in Baihetan Hydropower Station. International Journal of Rock Mechanics and Mining Sciences, 104: 27–33. https://doi.org/10.1016/j.ijrmms.2018.02.011
Jiang, M. J., Zhang, N., Cui, L., et al., 2015. A Size-Dependent Bond Failure Criterion for Cemented Granules Based on Experimental Studies. Computers and Geotechnics, 69: 182–198. https://doi.org/10.1016/j.compgeo.2015.05.007
Jiang, P. F., Jing, S. L., Li, P., et al., 2020. Mechanism and Application of Pre-Stressed Grouting Bolt with Constant Resistance and Large Deformation. Geotechnical and Geological Engineering, 38(6): 5969–5977. https://doi.org/10.1007/s10706-020-01407-1
Kılıc, A., Yasar, E., Atis, C. D., 2003. Effect of Bar Shape on the Pull-out Capacity of Fully-Grouted Rockbolts. Tunnelling and Underground Space Technology, 18(1): 1–6. https://doi.org/10.1016/s0886-7798(02)00077-9
Kilic, A., Yasar, E., Celik, A. G., 2002. Effect of Grout Properties on the Pull-out Load Capacity of Fully Grouted Rock Bolt. Tunnelling and Underground Space Technology, 17(4): 355–362. https://doi.org/10.1016/s0886-7798(02)00038-x
Lan, H. X., Zhang, Y. X., Macciotta, R., et al., 2022. The Role of Discontinuities in the Susceptibility, Development, and Runout of Rock Avalanches: A Review. Landslides, 19(6): 1391–1404. https://doi.org/10.1007/s10346-022-01868-w
Li, B., Li, T., Xu, N. W., et al., 2018. Stability Assessment of the Left Bank Slope of the Baihetan Hydropower Station, Southwest China. International Journal of Rock Mechanics and Mining Sciences, 104: 34–44. https://doi.org/10.1016/j.ijrmms.2018.02.016
Li, C. C., Kristjansson, G., Hoien, A. H., 2016. Critical Embedment Length and Bond Strength of Fully Encapsulated Rebar Rockbolts. Tunnelling and Underground Space Technology, 59: 16–23. https://doi.org/10.1016/j.tust.2016.06.007
Li, C. D., Wu, J. J., Tang, H. M., et al., 2016. Model Testing of the Response of Stabilizing Piles in Landslides with Upper Hard and Lower Weak Bedrock. Engineering Geology, 204: 65–76. https://doi.org/10.1016/j.enggeo.2016.02.002
Liu, Y., Dai, F., Zhao, T., et al., 2017. Numerical Investigation of the Dynamic Properties of Intermittent Jointed Rock Models Subjected to Cyclic Uniaxial Compression. Rock Mechanics and Rock Engineering, 50(1): 89–112. https://doi.org/10.1007/s00603-016-1085-y
Ma, S. Q., Zhao, Z. Y., Nie, W., et al., 2016. A Numerical Model of Fully Grouted Bolts Considering the Tri-Linear Shear Bond-Slip Model. Tunnelling and Underground Space Technology, 54: 73–80. https://doi.org/10.1016/j.tust.2016.01.033
Ma, Q., Tan, Y. L., Liu, X. S., et al., 2020. Effect of Coal Thicknesses on Energy Evolution Characteristics of Roof Rock-Coal-Floor Rock Sandwich Composite Structure and Its Damage Constitutive Model. Composites Part B: Engineering, 198: 108086. https://doi.org/10.1016/j.compositesb.2020.108086
Nemcik, J., Ma, S. Q., Aziz, N., et al., 2014. Numerical Modelling of Failure Propagation in Fully Grouted Rock Bolts Subjected to Tensile Load. International Journal of Rock Mechanics and Mining Sciences, 71: 293–300. https://doi.org/10.1016/j.ijrmms.2014.07.007
Ren, F. F., Yang, Z. J., Chen, J. F., et al., 2010. An Analytical Analysis of the Full-Range Behaviour of Grouted Rockbolts Based on a Tri-Linear Bond-Slip Model. Construction and Building Materials, 24(3): 361–370. https://doi.org/10.1016/j.conbuildmat.2009.08.021
Shen, P. W., Tang, H. M., Zhang, B. C., 2021. Investigation on the Fracture and Mechanical Behaviors of Simulated Transversely Isotropic Rock Made of Two Interbedded Materials. Engineering Geology, 286: 106058. https://doi.org/10.1016/j.enggeo.2021.106058
Song, Y., Li, Y. Q., 2021. Study on the Constitutive Model of the Whole Process of Macroscale and Mesoscale Shear Damage of Prestressed Anchored Jointed Rock. Bulletin of Engineering Geology and the Environment, 80(8): 6093–6106. https://doi.org/10.1007/s10064-021-02332-0
Tang, H. M., Wasowski, J., Juang, C. H., 2019. Geohazards in the Three Gorges Reservoir Area, China—Lessons Learned from Decades of Research. Engineering Geology, 261: 105267. https://doi.org/10.1016/j.enggeo.2019.105267
Teng, J. Y., Tang, J. X., Zhang, Y. N., et al., 2018. CT Experimental Study on the Damage Characteristics of Anchored Layered Rocks. KSCE Journal of Civil Engineering, 22(9): 3653–3662. https://doi.org/10.1007/s12205-018-0425-8
Wang, H. N., Xiao, G., Jiang, M. J., et al., 2018. Investigation of Rock Bolting for Deeply Buried Tunnels via a New Efficient Hybrid DEM-Analytical Model. Tunnelling and Underground Space Technology, 82: 366–379. https://doi.org/10.1016/j.tust.2018.08.048
Wang, Y. J., Wu, Z. M., Zheng, J. J., et al., 2019. Three-Dimensional Analytical Model for the Pull-out Response of Anchor-Mortar-Concrete Anchorage System Based on Interfacial Bond Failure. Engineering Structures, 180: 234–248. https://doi.org/10.1016/j.engstruct.2018.11.024
Wang, G. H., Li, C. D., He, X., et al., 2022. Mechanism of Interaction between Anchored Slide-Resistant Piles and Landslides with Weak-Hard Interbedded Bedrock: Model Tests and Theoretical Interpretation. Journal of Earth Science.https://doi.org/10.1007/s12583-022-1663-8
Wu, X. Z., Jiang, Y. J., 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. https://doi.org/10.1007/s00603-017-1365-1
Xu, X., Xing, Y. C., Guo, Z., et al., 2021. Stability Analysis of Rainfall-Triggered Toe-Cut Slopes and Effectiveness Evaluation of Pile-Anchor Structures. Journal of Earth Science, 32(5): 1104–1112. https://doi.org/10.1007/s12583-021-1474-3
Yong, M. T., Tsao, P. F., 2000. Preparation and Mechanical Properties of Artificial Transversely Isotropic Rock. International Journal of Rock Mechanics and Mining Sciences, 37(6): 1001–1012. https://doi.org/10.1016/s1365-1609(00)00024-1
Zhan, Y. B., Zhang, J., Li, N., et al., 2020. An Analytical Solution for the Critical Anchorage Length of Grouted Rockbolts. Arabian Journal of Geosciences, 13(17): 1–11. https://doi.org/10.1007/s12517-020-05866-x
Zhang, H. W., Li, C. D., Chen W. Q., et al., 2022. Upper-Bound Limit Analysis of the Multi-Layer Slope Stability and Failure Mode Based on Generalized Horizontal Slice Method, Journal of Earth Science.https://doi.org/10.1007/s12583-022-1626-0
Zhao, Y. M., Yang, M. J., 2011. Pull-out Behavior of an Imperfectly Bonded Anchor System. International Journal of Rock Mechanics and Mining Sciences, 48(3): 469–475. https://doi.org/10.1016/j.ijrmms.2010.09.011
Zuo, J. P., Wen, J. H., Li, Y. D., et al., 2019. Investigation on the Interaction Mechanism and Failure Behavior between Bolt and Rock-Like Mass. Tunnelling and Underground Space Technology, 93: 103070. https://doi.org/10.1016/j.tust.2019.103070
Acknowledgments
This work is supported by the National Natural Science Foundation of China (Nos. 42090054, 41922055 and 41931295), the Research Project of China Three Gorges Corporation (No. 2019073), and the Zhejiang Huadong Construction Engineering Co., Ltd. (No. KY2019-HDJS-07), the Key Research and Development Program of Hubei Province of China (No. 2022CFA002). The final publication is available at Springer via https://doi.org/10.1007/s12583-022-1785-z.
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Wang, Y., Li, C., Cai, Z. et al. Mechanical Behaviors of Anchorage Interfaces in Layered Rocks with Fractures under Axial Loads. J. Earth Sci. 34, 354–368 (2023). https://doi.org/10.1007/s12583-022-1785-z
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DOI: https://doi.org/10.1007/s12583-022-1785-z