大型地下洞室围岩体蠕变参数位移反分析研究  

DISPLACEMENT BACK ANALYSIS OF CREEP PARAMETERS OF ENGINEERING ROCK MASS IN LARGE-SCALE UNDERGROUND CHAMBERS

作　　者：伍国军[1] 陈卫忠[1,2] 贾善坡[3] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]山东大学岩土与结构工程研究中心,山东济南250061 [3]长江大学城市建设学院,湖北荆州434023

出　　处：《岩石力学与工程学报》2010年第A02期4043-4049,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51009133);国家自然科学基金重大国际合作项目(50720135906);中国科学院西部行动计划(KJCX–YW–506)

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。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.

关 键 词：岩石力学 蠕变 力学参数 反演 地下工程 

分 类 号：TU45[建筑科学—岩土工程]