大型地下洞室围岩体蠕变参数位移反分析研究

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摘要工程岩体蠕变参数的反演是大型地下工程围岩体稳定性分析中的一项重要研究内容。以锦屏二级水电站地下厂房为研究背景，根据现场施工得到的动态监测资料，通过建立能反映实际施工开挖顺序的计算力学模型，采用精确罚函数法以及Nelder-Mead优化算法相结合的有限元位移反分析计算程序，对地下厂房围岩体蠕变参数进行反演研究。结果表明：反演位移值与现场实测值非常接近，绝大部分反演结果与实测值误差均在8%以内，反演结果较为理想；并得到了围岩体开挖蠕变后的合理应力变形特征。研究成果为地下洞室群的长期稳定性和可靠性研究提供理论依据。

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	伍国军1
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关键词 ：岩石力学, 蠕变, 力学参数, 反演, 地下工程

Abstract：Back analysis of creep parameters of engineering rock mass is a most important research subject of stability analysis of rock mass in large-scale underground engineering. According to the dynamic monitoring data of Jinping II underground powerhouse，an analytical model is established which can objectively reflect construction and excavation sequences；by using a finite element program of displacement back analysis combining a new exact penalty method and the Nelder-Mead algorithm，creep parameters of rock mass of Jinping II underground powerhouse are studied. The results show that it is desirable that the calculated displacements are very close to the measured ones，and most of errors are within 8%；the reasonable stress and displacement distributions of rock mass considering creep after excavation are presented. The research achievements can provide theory basis for deeply researching the long-term stability and reliability of large-scale underground chambers.

Key words： rock mechanics creep mechanical parameters back analysis underground engineering

引用本文:

伍国军1，陈卫忠1，2，贾善坡3. 大型地下洞室围岩体蠕变参数位移反分析研究[J]. 岩石力学与工程学报, 2010, 29(S2): 4043-4049.
WU Guojun1，CHEN Weizhong1，2，JIA Shanpo3. DISPLACEMENT BACK ANALYSIS OF CREEP PARAMETERS OF ENGINEERING ROCK MASS IN LARGE-SCALE UNDERGROUND CHAMBERS. , 2010, 29(S2): 4043-4049.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/IS2/4043

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