Compensation control method and experimental study of deep chamber group excavation

Abstract

In response to the difficulty of controlling the stability of the surrounding rock in deep mining chambers, taking a typical deep coal mine pump chamber group as the engineering background, the deformation development mode, loosening range expansion law, and anchor (cable) bearing state of the chamber group under the influence of construction disturbance were analyzed. A compensation control method for deep chamber group excavation with the core of “stress compensation, grouting reinforcement, and excavation disturbance reduction” was proposed. To further verify the rationality of this method, large-scale geomechanical model tests and numerical simulation tests were conducted. The distribution and evolution of stress and displacement fields in the surrounding rock during the construction process of chamber groups were analyzed. The results show that compared with traditional control methods, using the compensation control method for deep chamber group excavation increased the stress of the shallow surrounding rock by 68.2% and reduced the surface displacement of the surrounding rock by 35.5%. Based on the above research, the field tests were conducted. The monitoring results showed that the maximum deformation of the surrounding rock was 115 mm, and the utilization rate of cable strength was 63.8%, achieving stability control of the deep chamber group.

Keywords

deep chamber group / excavation compensation control / geomechanical model tests / numerical test / field test

References

[1] Marschalko M, Yilmaz I, Bednárik M, et al. . Relevance of building site categories implementation into the land use plan in underground mining area in the region of Petrvald (Czech Republic). Environmental Earth Sciences, 2014, 72(9): 3443-3456 J]

[2] Wang Q, Wang Y-c, Jiang B, et al. . Geomechanics model test research on large deformation control mechanism of roadway disturbed by strong dynamic pressure. Geohazard Mechanics, 2023, 1(2): 140-152 J]

[3] Wang M-y, Fan P-x, Qian Q-h, et al. . Elastoplastic model for discontinuous shear deformation of deep rock mass. Journal of Central South University, 2011, 18(3): 866-873 J]

[4] Liu D-w, Gu D-s, Dai T-g, et al. . Analysis and calculation of thermal conductivity of rock in deep strata. Journal of Central South University of Technology, 2005, 12(1): 114-119 J]

[5] Hudyma M, Potvin Y H. An engineering approach to seismic risk management in hardrock mines. Rock Mechanics and Rock Engineering, 2010, 43(6): 891-906 J]

[6] Suchowerska A M, Merifield R S, Carter J P. Vertical stress changes in multi-seam mining under supercritical longwall panels. International Journal of Rock Mechanics and Mining Sciences, 2013, 61: 306-320 J]

[7] Lu W-b, Li P, Chen M, et al. . Comparison of vibrations induced by excavation of deep-buried cavern and open pit with method of bench blasting. Journal of Central South University, 2011, 18(5): 1709-1718 J]

[8] Khaledi K, Hamdi P, Winhausen L, et al. . Unloading induced absolute negative pore pressures in a low permeable clay shale. Engineering Geology, 2021, 295: 106451 J]

[9] Oreste P, Hedayat A, Spagnoli G. Effect of gravity of the plastic zones on the behavior of supports in very deep tunnels excavated in rock masses. International Journal of Geomechanics, 2019, 19(9): 04019107 J]

[10] He M-c, Wang Qi. Excavation compensation method and key technology for surrounding rock control. Engineering Geology, 2022, 307: 106784 J]

[11] He M-c, Sui Q-r, Li M-n, et al. . Compensation excavation method control for large deformation disaster of mountain soft rock tunnel. International Journal of Mining Science and Technology, 2022, 32(5): 951-963 J]

[12] Sun X-m, Wang D, Yang J, et al. . Study on the coupling support strategy of constant resistance and large deformation for soft rock roadway at the return air crosscut of Xin’an Coal Mine. Chinese Journal of Rock Mechanics and Engineering, 2014, 33: 4129-4138 [J]

[13] Wang Q, Jiang B, Xu S, et al. . Roof-cutting and energy-absorbing method for dynamic disaster control in deep coal mine. International Journal of Rock Mechanics and Mining Sciences, 2022, 158: 105186 J]

[14] Jiang B, Ma F-l, Wang Q, 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]

[15] Zhu Q-w, Li T-c, Zhang H, et al. . True 3D geomechanical model test for research on rheological deformation and failure characteristics of deep soft rock roadways. Tunnelling and Underground Space Technology, 2022, 128: 104653 J]

[16] Huang Y-b, Wang Q, Gao H-k, et al. . Failure mechanism and construction process optimization of deep soft rock caverns. Journal of China University of Mining and Technology, 2021, 50: 69-78 [J]

[17] Tzou H K, Chu T-s, Liu T-y. Enhancing the safety management of NATM using the tunnel seismic prediction method: A case study. Innovative Infrastructure Solutions, 2020, 5(3): 106 J]

[18] Wang Q, Jiang B, Pan R, et al. . Failure mechanism of surrounding rock with high stress and confined concrete support system. International Journal of Rock Mechanics and Mining Sciences, 2018, 102: 89-100 J]

[19] Wang Q, Luan Y-c, Jiang B, et al. . Study on key technology of tunnel fabricated arch and its mechanical mechanism in the mechanized construction. Tunnelling and Underground Space Technology, 2019, 83: 187-194 J]

[20] Wang Q, Xu S, Xin Z-x, et al. . Mechanical properties and field application of constant resistance energy-absorbing anchor cable. Tunnelling and Underground Space Technology, 2022, 125: 104526 J]

[21] Liu P, Wang H-t, Liu Q-s, et al. . FDEM numerical study on the large deformation mechanism of layered rock mass tunnel under excavation-unloading disturbance. Tunnelling and Underground Space Technology, 2025, 159: 106497 J]

[22] Yang M, Sun Q, Li W-c, et al. . Three-dimensional finite element analysis on effects of tunnel construction on nearby pile foundation. Journal of Central South University, 2011, 18(3): 909-916 J]

[23] Duan L-l, Fang L-g. Interaction between transverse isotropy rock slope and supporting structure. Journal of Central South University of Technology, 2008, 15(1): 415-423 J]

[24] Zhu W-s, Li S-c, Bai S-w, et al. . Several developments in the principles of construction process mechanics and engineering case analysis. Chinese Journal of Rock Mechanics and Engineering, 2003, 10: 1586-1591 [J]

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Central South University