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Numerical Simulation of the Stability of Rock Mass around Large Underground Cavern

Dang Van Kien, Do Ngoc Anh, Do Ngoc Thai

Abstract


Geotechnical problems are complicated to the extent and cannot be expected in other areas since non-uniformities of existing discontinuous, pores in materials and various properties of the components. At present, it is extremely difficult to develop a program for tunnel analysis that considers all complicated factors. However, tunnel analysis has made remarkable growth for the past several years due to the development of numerical analysis method and computer development, given the situation that it was difficult to solve formula of elasticity, viscoelasticity, and plasticity for the dynamic feature of the ground when the constituent laws, yielding conditions of ground materials, geometrical shape and boundary conditions of the structure were simulated in the past. The stability of rock mass around an underground large cavern is the key to the construction of large-scale underground projects. In this paper, the stability analysis was carried out based on those parameters by using 2D FEM RS2 program. The calculated stress and displacements of surrounding rock and rock support by FEM analysis were compared with those allowable values. The pattern of deformation, stress state, and the distribution of plastic areas are analyzed. Finally, the whole stability of surrounding rock mass of underground caverns was evaluated by Rocscience - RS2 software. The calculated axial forces were far below design capacity of rock bolts. The strong rock mass strength and high horizontal to vertical stress ratio enhanced safe working conditions throughout the excavation period. Thus wide span caverns and the system of caverns could be stability excavated sedimentary rock during the underground cavern and the system of caverns excavation by blasting method. The new method provides a reliable way to analyze the stability of the caverns and the system of caverns and also will help to design or optimize the subsequent support.

 

Doi: 10.28991/CEJ-2022-08-01-06

Full Text: PDF


Keywords


Large Cavern; Stability; Surrounding Rock; Cai Mep; Numerical Analysis; RS2.

References


Jang, S. B., & Moon, H. K. (1998). A study on the quantitative evaluation of the load distribution factors considering the design conditions of tunnel-especially for the ring-cut excavation method. Journal of the Korean Geotechnical Society, 14(5), 5-15.

Hyosung VINA Chemicals Co., Ltd. (2019). Report on technical design of underground storage Cai Mep-LPG-CV-GR-U-0002. Vung Tau.

Palmstrom, A., & Broch, E. (2006). Use and misuse of rock mass classification systems with particular reference to the Q-system. In Tunnelling and Underground Space Technology (Vol. 21, Issue 6). Tunnels and Underground Space Technology. doi:10.1016/j.tust.2005.10.005.

Habibi, R. (2019). An investigation into design concepts, design methods and stability criteria of salt caverns. Oil and Gas Science and Technology, 74, 14. doi:10.2516/ogst/2018066.

Zhang, B., Wang, H., Wang, L., & Xu, N. (2019). Stability analysis of a group of underground anhydrite caverns used for crude oil storage considering rock tensile properties. Bulletin of Engineering Geology and the Environment, 78(8), 6249–6265. doi:10.1007/s10064-019-01497-z.

Yin, H., Yang, C., Ma, H., Shi, X., Zhang, N., Ge, X., Li, H., & Han, Y. (2020). Stability evaluation of underground gas storage salt caverns with micro-leakage interlayer in bedded rock salt of Jintan, China. Acta Geotechnica, 15(3), 549–563. doi:10.1007/s11440-019-00901-y.

Gu, S., Zhou, P., Sun, W., Hu, C., Li, Z., & Wang, C. (2018). Study on the Stability of Surrounding Rock of Underground Circular Cavern Based on the Anchor Reinforcement Effect. Advances in Civil Engineering, 2018, 1–18. doi:10.1155/2018/4185070.

Gu, S., Zhou, P., Sun, W., Hu, C., Li, Z., & Wang, C. (2018). Study on the Stability of Surrounding Rock of Underground Circular Cavern Based on the Anchor Reinforcement Effect. Advances in Civil Engineering, 2018, 18. doi:10.1155/2018/4185070.

Winn, K., Ng, M., & Wong, L. N. Y. (2017). Stability Analysis of Underground Storage Cavern Excavation in Singapore. Procedia Engineering, 191, 1040–1047. doi:10.1016/j.proeng.2017.05.277.

Gu, S., Zhou, P., Sun, W., Hu, C., Li, Z., & Wang, C. (2018). Study on the Stability of Surrounding Rock of Underground Circular Cavern Based on the Anchor Reinforcement Effect. Advances in Civil Engineering, 2018, 1–18. doi:10.1155/2018/4185070.

Ren, Q., Xu, L., Zhu, A., Shan, M., Zhang, L., Gu, J., & Shen, L. (2021). Comprehensive safety evaluation method of surrounding rock during underground cavern construction. In Underground Space (China) (Vol. 6, Issue 1, pp. 46–61). doi:10.1016/j.undsp.2019.10.003.

Chimmani, K. V., & Lokhande, R. D. (2021). Study the Behaviour of Underground Oil Cavern under Static Loading Condition. Geotechnical and Geological Engineering. doi:10.1007/s10706-021-01939-0.

Liu, J., Zhao, X. D., Zhang, S. J., & Xie, L. K. (2018). Analysis of support requirements for underground water-sealed oil storage cavern in China. Tunnelling and Underground Space Technology, 71, 36–46. doi:10.1016/j.tust.2017.08.013.

Xingdong, Z., Lei, D., & Shujing, Z. (2020). Stability analysis of underground water-sealed oil storage caverns in China：A case study. Energy Exploration and Exploitation, 38(6), 2252–2276. doi:10.1177/0144598720922307.

Ren, Q., Xu, L., Zhu, A., Shan, M., Zhang, L., Gu, J., & Shen, L. (2021). Comprehensive safety evaluation method of surrounding rock during underground cavern construction. Underground Space (China), 6(1), 46–61. doi:10.1016/j.undsp.2019.10.003.

Liu, J., Zhao, X. D., Zhang, S. J., & Xie, L. K. (2018). Analysis of support requirements for underground water-sealed oil storage cavern in China. Tunnelling and Underground Space Technology, 71, 36–46. doi:10.1016/j.tust.2017.08.013.

Liu, W., Zhang, Z., Fan, J., Jiang, D., & Daemen, J. J. K. (2020). Research on the Stability and Treatments of Natural Gas Storage Caverns with Different Shapes in Bedded Salt Rocks. IEEE Access, 8, 18995–19007. doi:10.1109/ACCESS.2020.2967078.


Full Text: PDF

DOI: 10.28991/CEJ-2022-08-01-06

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