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开挖进尺对西禹砾岩竖井衬砌变形及围岩应力的影响

Impact of excavation footage on vertical shaft lining deformation and surrounding rock stress in Xiyu conglomerate.

作者信息

Wu Hao, Jin Jin, Geng Kaiqiang, Qiao Yu, Sun Jianren

机构信息

College of Water Conservancy & Architectural Engineering, Shihezi University, Xinjiang, 832000, China.

Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi, 832000, Xinjiang, China.

出版信息

Sci Rep. 2024 Oct 27;14(1):25659. doi: 10.1038/s41598-024-77636-8.

DOI:10.1038/s41598-024-77636-8
PMID:39465337
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11514298/
Abstract

The Xiyu conglomerate, which is extensively distributed in Xinjiang, China, presents challenges for vertical shaft construction owing to its poor cementation and low strength. The selection of an appropriate footage length is paramount for ensuring safe construction. Based on the shaft pipeline construction project of the Xinlongkou Hydropower Station on the Kuitun River, this study investigated the impact of footage length on the stability of vertical shafts within the Xiyu conglomerate strata using finite element simulation and measurement data to analyze the lining displacement and change in stress in the surrounding rock. The results show that the excavation footage has little effect on the lining's horizontal displacement during vertical shaft excavation. A mathematical model was developed to describe how the vertical displacement of the lining varies with the excavation footage and vertical shaft depth. Below a critical threshold, the stress in the surrounding rock cannot be effectively alleviated, leading to a concentration of stress; above that critical threshold, an excessively large excavation increases the load on the surrounding rock. Based on the simulation results and factors such as economic benefits, construction speed, and safety, an excavation footage of 4 m is judged to be appropriate.

摘要

西域砾岩在中国新疆广泛分布，因其胶结性差、强度低，给竖井施工带来了挑战。选择合适的进尺长度对于确保施工安全至关重要。基于奎屯河新龙口水电站竖井管道建设项目，本研究利用有限元模拟和测量数据，研究了进尺长度对西域砾岩地层内竖井稳定性的影响，以分析衬砌位移和围岩应力变化。结果表明，竖井开挖过程中，开挖进尺对衬砌水平位移影响较小。建立了一个数学模型来描述衬砌垂直位移随开挖进尺和竖井深度的变化情况。低于临界阈值时，围岩应力无法有效缓解，导致应力集中；高于该临界阈值时，过大的开挖会增加围岩荷载。基于模拟结果以及经济效益、施工速度和安全性等因素，判定4米的开挖进尺是合适的。

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Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shaanxi mining area.
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