龙滩水电站左岸地下厂房区三维地应力场反演分析
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摘要
在龙滩地下厂房区工程地质和试验洞变形监测结果综合分析的基础上,建立地质概化和试验洞施工开挖模型;采用地应力场随埋深变化呈线性分布的假设,并根据地应力测试成果,确定地应力场的分布区间。在此基础上,采用均匀设计方法和三维显式有限差分法,通过模拟试验洞的开挖变形,对龙滩水电站厂房区岩体地应力场进行了三维变形反演分析。对比计算位移和监测位移,计算各方案的位移目标函数,获得了岩体地应力场沿深度的分布规律。比较监测与计算位移,两者在量值上相当,在变形趋势上也基本相同,而且实测与计算所得的地应力值较吻合,表明所获得的岩体地应力场是基本合理的,同时说明此反演方法简便、有效。
Based on the comprehensive analysis of geological conditions and deformation monitoring,the simplified geological model and excavation model of the experimental cavity are set up. The assumption of linear distribution of in-situ stresses of rock masses along depth is adopted,and based on the in-situ stress measurement, the interval of in-situ stresses is decided for back analysis. Then,the uniform design method and FLAC3D are used to make back-analysis on in-situ stress field of the underground powerhouse area of Longtan Hydropower Station through simulating the excavation of the experimental cavity by steps. 12 excavation cases are selected for simulation. The displacement object function values are calculated for each case by steps. The minimization of object function is made,and the distribution regularity of in-situ stresses of rock masses along depth is obtained. By comparison of measured and calculated displacements and in-situ stresses of rock masses,it is shown that the obtained results are satisfactory and the presented back analysis is reasonable and effective.
Based on the comprehensive analysis of geological conditions and deformation monitoring,the simplified geological model and excavation model of the experimental cavity are set up. The assumption of linear distribution of in-situ stresses of rock masses along depth is adopted,and based on the in-situ stress measurement, the interval of in-situ stresses is decided for back analysis. Then,the uniform design method and FLAC3D are used to make back-analysis on in-situ stress field of the underground powerhouse area of Longtan Hydropower Station through simulating the excavation of the experimental cavity by steps. 12 excavation cases are selected for simulation. The displacement object function values are calculated for each case by steps. The minimization of object function is made,and the distribution regularity of in-situ stresses of rock masses along depth is obtained. By comparison of measured and calculated displacements and in-situ stresses of rock masses,it is shown that the obtained results are satisfactory and the presented back analysis is reasonable and effective.
引文
1丰定样,谷光荣,杨家岭等.关于地下工程有限元分析中初始地应力场的假定[J].地下工程,1982,(2):20～27
2郭怀志,马启超,薛空成等.岩体初始应力场的分析方法[J].岩土工程学报,1983,5(3):64～75
3朱伯芳.岩体初始地应力反分析[J].水利学报,1994,(10):30～35
4佘成学,熊文林,陈胜宏.边坡初始地应力场的应力函数与有限元联合反演法[J].武汉水利电力大学学报,1995,28(4):366～371
5方祖烈,路长全.西石门铁矿地应力量测与应力场的反分析[J].岩石力学与工程学报,1992,11(1):96～105
6于波,蔡美峰,乔兰.灰色建模理论在峨口铁矿地应力分布规律研究中的应用[J].岩石力学与工程学报,1996,15(2):122～127
7喻军华,金伟良,邹道勤.分析初始地应力场的位移函数法[J].岩土力学,2003,24(3):417～419
8邱祥波,李术才,李树忧.三维地应力回归分析方法与工程应用[J].岩石力学与工程学报,2003,22(10):1613～1617
9庞作会,陈文胜,邓建辉等.复杂初始地应力场的反分析[J].岩土工程学报,1998,20(4):44～47
10杨志法,熊顺成,王存玉等.关于位移反分析的某些考虑[J].岩石力学与工程学报,1995,14(1):11～16
11王晓春,聂德新,冯庆祖.V 型河谷地应力研究[J].工程地质学报,2002,10(2):146～151
12朱焕春,陶振宇.不同岩石中地应力分布[J].地震学报,1994,16(1):49～63
13方开泰.均匀设计与均匀设计表[M].北京:科学出版社,1994
14刘允芳.岩地应力与工程建设[M].湖北:湖北科学技术出版社,2000
2郭怀志,马启超,薛空成等.岩体初始应力场的分析方法[J].岩土工程学报,1983,5(3):64～75
3朱伯芳.岩体初始地应力反分析[J].水利学报,1994,(10):30～35
4佘成学,熊文林,陈胜宏.边坡初始地应力场的应力函数与有限元联合反演法[J].武汉水利电力大学学报,1995,28(4):366～371
5方祖烈,路长全.西石门铁矿地应力量测与应力场的反分析[J].岩石力学与工程学报,1992,11(1):96～105
6于波,蔡美峰,乔兰.灰色建模理论在峨口铁矿地应力分布规律研究中的应用[J].岩石力学与工程学报,1996,15(2):122～127
7喻军华,金伟良,邹道勤.分析初始地应力场的位移函数法[J].岩土力学,2003,24(3):417～419
8邱祥波,李术才,李树忧.三维地应力回归分析方法与工程应用[J].岩石力学与工程学报,2003,22(10):1613～1617
9庞作会,陈文胜,邓建辉等.复杂初始地应力场的反分析[J].岩土工程学报,1998,20(4):44～47
10杨志法,熊顺成,王存玉等.关于位移反分析的某些考虑[J].岩石力学与工程学报,1995,14(1):11～16
11王晓春,聂德新,冯庆祖.V 型河谷地应力研究[J].工程地质学报,2002,10(2):146～151
12朱焕春,陶振宇.不同岩石中地应力分布[J].地震学报,1994,16(1):49～63
13方开泰.均匀设计与均匀设计表[M].北京:科学出版社,1994
14刘允芳.岩地应力与工程建设[M].湖北:湖北科学技术出版社,2000
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