Excavation deformation characteristics of underground caverns across fault fracture zone: a case study at Baihetan hydropower station

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-22 DOI:10.1007/s10064-024-03949-7

Yong Fan, Wenzhuo Li, Guangdong Yang, Xingxia Wang, Bin Tian, Xiaochun Lu

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Abstract

The right bank plant of Baihetan Hydropower Station has exposed C₄, C₅, and other fault fracture zones (FFZs), thereby increasing rock mass instability. In this paper, the effects of the number and location of FFZ on rock mass deformation were analyzed using field monitoring data. In addition, a validated numerical simulation method was employed to discuss the influence of excavation methods and FFZ properties on rock mass deformation. Results show that as the width of the middle pilot tunnel increases, the top arch deformation initially rises and then falls. Excavating the sidewalls first will significantly aggravate the deformation. As the width or dip-angle of FFZ increases or its height from the top arch decreases, the top arch deformation becomes more significant. The first layer excavation of the plant significantly influences the rock mass deformation. The rock mass located more than twice the width of the tunnel is almost unaffected by FFZ. This study is significant for the stability analysis of deep-buried caverns across FFZ.

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跨断层破碎带地下洞室开挖变形特征：白鹤滩水电站案例研究

白鹤滩水电站右岸厂房出露了 C4、C5 等断层破碎带（FFZ），从而增加了岩体的不稳定性。本文利用现场监测数据，分析了断层破碎带的数量和位置对岩体变形的影响。此外，还采用了经过验证的数值模拟方法，讨论了开挖方法和 FFZ 特性对岩体变形的影响。结果表明，随着中间试验隧道宽度的增加，拱顶变形先上升后下降。先开挖侧壁会明显加剧变形。随着 FFZ 宽度或倾角的增大，或其距顶拱高度的减小，顶拱变形会变得更加明显。厂房首层开挖对岩体变形有很大影响。位于隧道宽度两倍以上的岩体几乎不受 FFZ 的影响。这项研究对跨 FFZ 的深埋洞室稳定性分析具有重要意义。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.