Deformation characteristics observed during multi-step excavation of underground oil storage caverns based on field monitoring and numerical simulation
Title
Deformation characteristics observed during multi-step excavation of underground oil storage caverns based on field monitoring and numerical simulation
Subject
Deformation
Petroleum prospecting
Groundwater
Caves
Excavation
Arches
Description
The sequential excavation method (SEM) is extremely useful for excavating caverns with high sidewalls and large spans. A new SEM for excavating large-scale underground water-sealing oil storage caverns and protecting groundwater level is proposed. The method is applied to practice successfully and the excavation characteristics were studied using monitoring datasets. Through finite element simulations, the differences between the proposed method and three-bench three-step method were compared. The influence of the section shape, bench division, and face-advancing sequences on the deformation characteristics observed in multi-step excavation was analyzed. The results showed that the maximum deformation of the excavation face was approximately 45mm, and the maximum deformation rate of surrounding rock was approximately 0.8mm/day. At 20days after excavation, although the deformation characteristics of surrounding rock were stable, internal displacement would continue for a long time. The standard circular arch and one-step arching were useful for settlement control, and the middle drift facilitated geological forecast and water exploration. However, the more complex the bench division of the arch, the more noticeable is the stress concentration. 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
6
80
Publisher
Environmental Earth Sciences
Date
2021
Contributor
Ning, Ze xu
Xue, Yi guo
Su, Mao xin
Qiu, Dao hong
Zhang, Kai
Li, Zhi qiang
Liu, Yi min
Type
journalArticle
Identifier
18666280
10.1007/s12665-021-09496-8
Collection
Citation
“Deformation characteristics observed during multi-step excavation of underground oil storage caverns based on field monitoring and numerical simulation,” Lamar University Midstream Center Research, accessed May 15, 2024, https://lumc.omeka.net/items/show/25866.