| 高地应力条件下地下厂房开挖动态卸荷引起的变形突变机制研究 |
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| 引用本文： | 罗忆,卢文波,周创兵,陈明,严鹏.高地应力条件下地下厂房开挖动态卸荷引起的变形突变机制研究[J].岩土力学,2011,32(5):1553-1560. |
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| 作者姓名： | 罗忆 卢文波 周创兵 陈明 严鹏 |
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| 作者单位： | 武汉大学,水资源与水电工程科学国家重点实验室,武汉,430072;武汉大学,水工岩石力学教育部重点实验室,武汉,430072 |
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| 基金项目： | 国家973计划项目，国家自然科学基金项目 |
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| 摘 要： | 分析了高地应力条件下地下厂房高边墙变形突变的形成机制,认为地应力动态卸荷引发的围岩松动是导致地下厂房高边墙变形突变的重要原因之一。基于瀑布沟地下厂房高边墙变形突变的实测资料,利用理论分析和数值模拟,计算了高地应力准静态和动态条件下地下厂房开挖卸荷引起的厂房高边墙的水平向位移。与实测资料对比表明,在动态卸荷过程中,结构面的张开和滑移是引起地下厂房围岩变形突变的主要原因,而在准静态卸载条件下,这种结构面张开变形却并不明显。在实际工程中应考虑开挖引起的地应力动态卸荷效应,尽量减小每次开挖对围岩扰动,谨防引起变形突变甚至失稳破坏。
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| 关 键 词： | 地下厂房 地应力 动态卸荷 变形突变 岩体开挖 |
| 收稿时间： | 2011-02-09 |
Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress |
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| LUO Yi,LU Wen-bo,ZHOU Chuang-bing,CHEN Ming,YAN Peng.Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress[J].Rock and Soil Mechanics,2011,32(5):1553-1560. |
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| Authors: | LUO Yi LU Wen-bo ZHOU Chuang-bing CHEN Ming YAN Peng |
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| Institution: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, China |
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| Abstract: | The mechanism of abrupt large deformation in the sidewall of underground powerhouse is analyzed.The surrounding rock mass dynamic loosening is concerned as a main cause of abrupt deformation in underground powerhouse.Based on the monitored data at Pubugou hydropower station,numerical analysis is conducted with finite element method;and horizontal displacements induced by excavation load quasi-static and dynamic unloading are calculated respectively.The result itself and comparison to monitored data show tha... |
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| Keywords: | underground powerhouse in-situ stress dynamic unloading abrupt deformation rock mass excavation |
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