| 超大型地下洞室高边墙围岩变形影响特性研究 |
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| 引用本文： | 刘健,朱赵辉,吴浩,张石磊,王晋明.超大型地下洞室高边墙围岩变形影响特性研究[J].岩土力学,2019,40(10):4030-4040. |
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| 作者姓名： | 刘健 朱赵辉 吴浩 张石磊 王晋明 |
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| 作者单位： | 1. 中国水利水电科学研究院，北京 100048；2. 雅砻江流域水电开发有限公司，四川 成都 610051 |
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| 基金项目： | 国家重点基础研究发展计划项目(973计划) (No. 2013CB035900)；国家重点研发计划(No. 2016YFC0600702)。 |
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| 摘 要： | 高边墙围岩稳定是超大型地下洞室施工期关注的重点。基于工程监测资料，探究了白鹤滩水电站左岸地下厂房高边墙围岩变形演化分布规律及破坏机制。研究表明：在垂直方向上，开挖面距离在10 m范围内边墙卸荷响应强烈，该阶段围岩变形约占总变形量的50%～55%；在洞轴方向上，开挖影响集中在2倍洞跨范围内，该区域内变形约占总变形量的97%；在结构面发育部位前后围岩变形的分异量较大，且由于软弱夹层的柔塑性，围压解除后错动带应变能释放是一个缓慢的过程，时效剪切特征明显；发掘并总结逐层下挖过程中高边墙围岩应力状态的演化规律，并划分为应变能积聚、释放、应力调整及趋稳4个阶段。该研究成果可为工程支护设计提供一定支撑，并供同类工程参考。
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| 关 键 词： | 层间错动带 地下厂房 变形特征 白鹤滩水电站 |
| 收稿时间： | 2019-01-30 |
Study of deformation characteristics of the high sidewall surrounding rock in super large underground caverns |
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| LIU Jian,ZHU Zhao-hui,WU Hao,ZHANG Shi-lei,WANG Jin-ming.Study of deformation characteristics of the high sidewall surrounding rock in super large underground caverns[J].Rock and Soil Mechanics,2019,40(10):4030-4040. |
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| Authors: | LIU Jian ZHU Zhao-hui WU Hao ZHANG Shi-lei WANG Jin-ming |
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| Institution: | 1.China Institude of Water Resources and Hydropower Research, Beijing 100048, China;
2. Yalong River Hydropower Development Co., Ltd., Chengdu, Sichuan 610051, China |
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| Abstract: | The stability of the surrounding rock of the high sidewall draws great attention during the construction of the super large underground cavern. Based on geological conditions, geophysical prospecting, monitoring data and construction materials, the deformation evolution mechanism, spatial distribution pattern and failure mode of the surrounding rock are analyzed by using rock mechanics theory and FLAC3D numerical simulation. The research shows that in the vertical direction, the unloading response of the surrounding rock under 10 m of the excavation surface is intense. The surrounding rock deformation accounts for 50%-55% of the total deformation during this period. In the axial direction of the cavern, the influence area by excavation is concentrated in the range of twice the span of cavern, and the displacement increment caused by excavation takes up about 97% of the total unloading displacement change. The difference in the deformation of the surrounding rock is large at different depths due to the geological structural surface. Because of the soft plasticity of the weak interlayer, the strain energy release after the confining pressure is a slow process, and the aging shearing characteristics are obvious. During the layer-by-layer excavation process, the stress state of the surrounding rock in high sidewalls has undergone four stages: the accumulation of strain energy, stress release, stress adjustment, and stree stabilization. These research results provide significant references for similar projects. |
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| Keywords: | interlayer staggered zones underground powerhouse deformation characteristics Baihetan hydropower station |
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