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| Simulation of surrounding rock stability of excavation and construction of reserve center rock pillar in the dome of large-span underground tank chamber |
| ZHAO Wenqiang1, ZHOU Jianwei2, YUAN Zhaoting3, WU Mingxiang4*, JIANG Yalong4, GENG Daxin4, LIU Changhong3
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1. China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, Shaanxi, China;
2. Eastern Theater Air Force Design Institute, Nanjing 210000, Jiangsu, China;
3. Nanchang Railway Engineering Co., Ltd., China Railway 24th Bureau Group, Nanchang 330000, Jiangxi, China;
4. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, Jiangxi, China |
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Abstract The large finite element analysis software MIDAS/GTS was used to numerically simulate the whole process of excavation and support of a single tank chamber of an underground oil and gas storage tank in Jiangxi, focusing on the analysis of the displacement field, stress field and plastic zone distribution characteristics of the surrounding rock after the excavation of the tank chamber was completed, and to study the influence of the central rock column reserved for the excavation of the dome on the vertical displacement of the surrounding rock at the center of the vault and the horizontal displacement of the surrounding rock at the foot of the vault. The research showed that the maximum vertical displacement of the surrounding rock occured in the vault and the bottom plate, the maximum sinking of the surrounding rock in the vault reached 12.71 mm, the maximum uplift of the surrounding rock in the bottom plate reached 17.96 mm, the maximum horizontal displacement occur in the side wall of the tank chamber, which was 1.99 mm, the distribution of the plastic zone near the foot of the dome was obvious, the overall deformation of the surrounding rock was not large, the displacement field, stress field and plastic zone characteristics basically met the stability requirements of the tank chamber. The center rock column reserved for dome excavation had almost no effect on the horizontal displacement of the surrounding rock during the excavation and support of the dome, and had a certain limiting effect on the sinking of the surrounding rock in the center of the vault, but after the removal of the center rock column, the displacement of the surrounding rock in the center of the vault changed abruptly to almost the same as the solution without the center rock column, and the basic contribution to limiting the overall vertical displacement of the surrounding rock after the excavation and support of the tank chamber was completed was not significant; In the case of better surrounding rock conditions, the dome excavation could be considered as a whole, without reserving the central rock column, which could save the construction cost and also meet the stability requirements of the surrounding rock.
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Received: 20 December 2021
Published: 20 June 2022
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