Design method of high prestressed support for shallow-buried large-span caverns

Abstract

The surrounding rock is prone to large-scale loosening and failure after the excavation of shallow large-span caverns because of the thin overlying strata and large cross-section span. The rational design of bolt support is very important to the safety control of surrounding rock as a common support means. The control mechanism and design method of bolt support for shallow-buried large-span caverns is carried out. The calculation method of bolt prestress and length based on arched failure and collapsed failure mode is established. The influence mechanism of different influencing factors on the bolt prestress and length is clarified. At the same time, the constant resistance energy-absorbing bolt with high strength and high toughness is developed, and the comparative test of mechanical properties is carried out. On this basis, the design method of high prestressed bolt support for shallow-buried large-span caverns is put forward, and the field test is carried out in Qingdao metro station in China. The monitoring results show that the maximum roof settlement is 6.8 mm after the new design method is adopted, and the effective control of the shallow-buried large-span caverns is realized. The research results can provide theoretical and technical support for the safety control of shallow-buried large-span caverns.

References

[1] Carranza-TorresC, ReichT. Analytical and numerical study of the stability of shallow underground circular openings in cohesive ground. Engineering Geology, 2017, 226: 70-92 J]

[2] DaraeiA, ZareS. A new multi-graph approach for selecting the sequential excavation method of civil tunnels. Tunnelling and Underground Space Technology, 2019, 91: 102999 J]

[3] NamK, KimJ, KwakD, et al.. Structure damage estimation due to tunnel excavation based on indoor model test. Geomechanics and Engineering, 2020, 21(2): 95-102[J]

[4] AygarE B, GokceogluC. A special support design for a large-span tunnel crossing an active fault (T9 Tunnel, Ankara – Sivas High-Speed Railway Project, Turkey). Environmental Earth Sciences, 2021, 80(1): 37 J]

[5] MahmoudiM, RajabiA M. A numerical simulation using FLAC^3D to analyze the impact of concealed karstic caves on the behavior of adjacent tunnels. Natural Hazards, 2023, 117(1): 555-577 J]

[6] SenentS, YiC-k, JimenezR. An upper bound solution for tunnel face stability analysis considering the free span. Tunnelling and Underground Space Technology, 2020, 103: 103515 J]

[7] YangX-l, YangZ-h, PanQ-j, et al.. Kinematical analysis of highway tunnel collapse using nonlinear failure criterion. Journal of Central South University, 2014, 21(1): 381-386 J]

[8] AygarE B. Evaluation of the relationship between the collapsed mechanism and excavation method in tunnels excavated in schists. Scientific Reports, 2022, 12: 21274 J]

[9] MoussaeiN, SharifzadehM, SahriarK, et al.. A new classification of failure mechanisms at tunnels in stratified rock masses through physical and numerical modeling. Tunnelling and Underground Space Technology, 2019, 91: 103017 J]

[10] JiangB, MaF-l, WangQ, et al.. Drilling-based measuring method for the c-φ parameter of rock and its field application. International Journal of Mining Science and Technology, 2024, 34(1): 65-76 J]

[11] SadaghianiM H, DadizadehS. Study on the effect of a new construction method for a large span metro underground station in Tabriz-Iran. Tunnelling and Underground Space Technology, 2010, 25(1): 63-69 J]

[12] ParkD, MichalowskiR L. Three-dimensional roof collapse analysis in circular tunnels in rock. International Journal of Rock Mechanics and Mining Sciences, 2020, 128: 104275 J]

[13] KorzeniowskiW, SkrzypkowskiK, HerezyŁ. Laboratory method for evaluating the characteristics of expansion rock bolts subjected to axial tension. Archives of Mining Sciences, 2015, 60(1): 209-224 J]

[14] JIANG Bei, WU Kun-bo, WANG Qi, et al. Development of physical model test system for fault-slip induced rockburst in underground coal mining [J]. Journal of Rock Mechanics and Geotechnical Engineering, 2024. DOI: https://doi.org/10.1016/j.jrmge.2024.04.003. (in Press)

[15] ZhangZ-q, LiH-y, YangH-y, et al.. Failure modes and face instability of shallow tunnels under soft grounds. International Journal of Damage Mechanics, 2019, 28(4): 566-589 J]

[16] YangF, YangJ-s. Limit analysis method for determination of earth pressure on shallow tunnel. Engineering Mechanics, 2008, 25(7): 179-184[J]

[17] LiuH, SongY. Design method of super large span chamber based on self-bearing theory of surrounding rock. Journal of Railway Engineering Society, 2021, 38(2): 1-7[J]

[18] LiY-x, YaoC. Collapse mechanism of deep tunnels with three-centered arch cross Section. Journal of Central South University, 2016, 23(12): 3293-3301 J]

[19] LeiM-f, PengL-m, ShiC-h, et al.. Upper bound analytical solution for surrounding rock pressure of shallow unsymmetrical loading tunnels. Journal of Central South University, 2015, 22(6): 2339-2347 J]

[20] JiangM-j, BoY-j, WangH-n, et al.. Study on the reinforcement mechanism of grouted bolts with or without prestress via the hybrid DEM-FDM method. Transportation Geotechnics, 2023, 40: 100967 J]

[21] LiP-f, ChenY, HuangJ-l, et al.. Design principles of prestressed anchors for tunnels considering bearing arch effect. Computers and Geotechnics, 2023, 156: 105307 J]

[22] YuW, WangB, ZiX, et al.. Effect of prestressed anchorage system on mechanical behavior of squeezed soft rock in large-deformation tunnel. Tunnelling and Underground Space Technology, 2023, 131: 104782 J]

[23] ChenZ-q, YaoY-k, WangB, et al.. Stability analysis and failure mechanism of multiple parallel soft-rock tunnels considering the random distribution of rockmass joints. Engineering Failure Analysis, 2024, 159: 108150 J]

[24] ZhengY-r. Development and application of numerical limit analysis for geological materials. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(7): 1297-1316[J]

[25] JiangB, WangM-z, WangQ, et al.. Bearing mechanism of roof and rib support structure in automatically formed roadway and its support design method. Journal of Central South University, 2024, 31(7): 2467-2487 J]

[26] HøienA H, NilsenB, OlssonR. Main aspects of deformation and rock support in Norwegian road tunnels. Tunnelling and Underground Space Technology, 2019, 86: 262-278 J]

[27] WangQ, XinZ-x, JiangB, et al.. Mechanical properties of rocks anchored by constant resistance energyabsorbing material. Journal of Central South University, 2023, 30(10): 3361-3373 J]

[28] TahmasebiniaF, ZhangC-g, CanbulatI, et al.. Numerical and analytical simulation of the structural behaviour of fully grouted cable bolts under impulsive loading. International Journal of Mining Science and Technology, 2018, 28(5): 807-811 J]

[29] KangH-p. Seventy years development and prospects of strata control technologies for coal mine roadways in China. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(1): 1-30[J]

[30] WangQ, SunL-f, JiangB, et al.. Research and application of a tunnel active-passive cooperative control mechanism. Tunnelling and Underground Space Technology, 2024, 149: 105801 J]

[31] WangS R, WuX G, ZhaoY H, et al.. Evolution characteristics of composite pressure-arch in thin bedrock of overlying strata during shallow coal mining. International Journal of Applied Mechanics, 2019, 11(3): 1950030 J]

[32] ZhouP, JiangY-f, ZhouF-c, et al.. Study on pressure arch effect of xigeda strata tunnel based on experiment and discrete element simulation. Bulletin of Engineering Geology and the Environment, 2022, 81(5): 199 J]

[33] YamamotoK, LyaminA V, WilsonD W, et al.. Stability of a circular tunnel in cohesive-frictional soil subjected to surcharge loading. Computers and Geotechnics, 2011, 38(4): 504-514 J]

[34] WangG-j. Dem analysis on stability of unsupported tunnels in jointed rock masses at different depths. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(7): 1154-1157[J]

[35] ZhangX-y, YanS-wFundamentals of geotechnics plasticity, 2006, Tianjin, Tianjin University Press[M]

[36] FraldiM, GuarracinoF. Analytical solutions for collapse mechanisms in tunnels with arbitrary cross Sections. International Journal of Solids and Structures, 2010, 47(2): 216-223 J]

[37] HeM-c, WangQi. Excavation compensation method and key technology for surrounding rock control. Engineering Geology, 2022, 307: 106784 J]

[38] WangQ, XuS, JiangB, et al.. Development of multi-functional anchorage support dynamic-static coupling performance test system and its application. International Journal of Mining Science and Technology, 2024, 34(3): 339-349 J]

[39] ZhouZ-h, ChenZ-q, HeC, et al.. A solution method for tunnel supporting structure system incorporating the active control of surrounding rock deformation. International Journal of Geomechanics, 2024, 24(1): 04023243 J]

[40] GB 50086-2001Specifications for bolt-shotcrete support, 2001, Beijing, China Planning Press[S]

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Central South University