Spatial and temporal stability analysis and assessment of underground powerhouse caverns: A case study

IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Hui Li, Weizhong Chen, Xianjun Tan, Xiaogang Wang
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Abstract

The spatial and temporal deformation features are important representations for stability analysis and assessment of the underground powerhouse. However, due to the excavation disturbance and sensors failure, the in-situ monitoring data may be of low quality. To reconstruct the actual project and analyze the full deformation characteristics of the underground powerhouse located in the Suki Kinari hydropower station, a BIM-based parametric geometry model of the caverns and the refined geological model are combined. An elaborate numerical analysis is implemented to discuss the spatial and temporal deformation features, and then, the deformation and failure mechanism has also been revealed. Results indicate that the deformation is time-dependent in a ladder form with the excavation process, and the deformation of rock mass is affected severely by the excavation of the corresponding and the following layers. Besides, the deformation values descend with the monitoring depth increasing. The excavation disturbed area enlarges with the unloading process, and the deformation at the corresponding position keeps deteriorating until new stability. For rock mass at the arch crown, nearly 90% of the total deformation occurs at the first layer excavation, indicating that immediate support is crucial. Besides, the deformation of rock mass at various depths is generally divided into three zones according to the decrement rate and magnitude. Furthermore, the failure of the surrounding rock mass is induced by the radial stress reduction and tangential stress increment, leading to excavation damage. Therefore, supporting strategies can be imposed to prevent stress variation.

Abstract Image

地下厂房洞室时空稳定性分析与评价:以实例为例
地下厂房的时空变形特征是地下厂房稳定性分析与评价的重要表征。然而,由于开挖扰动和传感器失效,现场监测数据质量较低。为了对苏木基纳里水电站地下厂房进行实际工程重构,分析地下厂房的全变形特征,将基于bim的洞室参数化几何模型与精化地质模型相结合。通过详细的数值分析,探讨了其时空变形特征,揭示了变形破坏机理。结果表明:变形随开挖过程呈阶梯式时变性,且开挖对岩体变形影响较大;变形值随监测深度的增加而减小。随着卸荷过程的进行,开挖扰动面积不断增大,相应位置的变形不断恶化,直至新的稳定。对于拱顶岩体,近90%的总变形发生在第一层开挖时,说明立即支护至关重要。此外,岩体在不同深度的变形一般按衰减速率和幅度划分为3个区。此外,径向应力减少和切向应力增加诱发围岩破坏,导致开挖破坏。因此,可以采用支持策略来防止应力变化。
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来源期刊
Environmental Earth Sciences
Environmental Earth Sciences 环境科学-地球科学综合
CiteScore
5.10
自引率
3.60%
发文量
494
审稿时长
8.3 months
期刊介绍: Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.
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