改进粒子群算法在地下工程反分析中的运用
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摘要
结合粒子群算法和变尺度法的特点,充分考虑二者的互补性,提出一种改进粒子群优化算法,并将其运用于地下工程增量位移反分析中.根据围岩松动圈的形成特点,提出采用分区分块的方法模拟围岩松动圈的影响,各分区的岩体力学参数不同并作为待反演参数.此法是反分析中考虑围岩松动圈影响的一种新途径.通过某大型水电站工程地下厂房的实例进行验证,得到比较合理有效的结果,反演得到的物理力学参数可信,可用于后期预测.该研究为地下工程反分析提供了一些切实可行的方法和思路.
There are different characteristics between particle swarm optimization algorithm and variable metric optimization algorithm.A modified particle swarm optimization algorithm is proposed according to their compatibility and algorithm complementary.Then influence of loosing zone is analyzed through area division method based on loosing zone's formation mechanism,which is a new approach to consider the influence of loosing zone in underground engineering back analysis.The rock mass parameters of all areas are different and are treated as unknown parameters.These methods are applied to the underground powerhouse of a large-scale hydropower engineering.The computational results show that the proposed algorithm is reasonable and effective.The parameters calculated by back analysis are believable and can be used to forecast anaphase excavation.The results provide some feasible methods and considerations for underground engineering back analysis.
There are different characteristics between particle swarm optimization algorithm and variable metric optimization algorithm.A modified particle swarm optimization algorithm is proposed according to their compatibility and algorithm complementary.Then influence of loosing zone is analyzed through area division method based on loosing zone's formation mechanism,which is a new approach to consider the influence of loosing zone in underground engineering back analysis.The rock mass parameters of all areas are different and are treated as unknown parameters.These methods are applied to the underground powerhouse of a large-scale hydropower engineering.The computational results show that the proposed algorithm is reasonable and effective.The parameters calculated by back analysis are believable and can be used to forecast anaphase excavation.The results provide some feasible methods and considerations for underground engineering back analysis.
引文
[1]杨志法,王思敬.岩土工程反分析原理及应用[M].北京:地震出版社,2002.
[2]丁德馨,张志军,孙钧.弹塑性位移反分析的遗传算法研究[J].工程力学,2003,20(6):1-5.
[3]刘世君,徐卫东,王红春.不确定性岩石力学参数的区间反分析[J].岩石力学与工程学报,2004,23(6):885-888.
[4]Yang X M,Yuan J S,Yuan J Y,Mao H N.A modi-fied particle swarm optimizer with dynamic adaptation[J].Applied Mathematics and Computation,2007,189:1205-1213.
[5]杨林德.岩土工程问题的反演理论与工程实践[M].北京:科学出版社,1996.
[6]郭凌云.地下洞室开挖扰动支护及围岩参数反馈分析研究[D].武汉:武汉大学,2004.
[7]肖明,刘志明.锦屏二级水电站三维地应力场反演回归分析[J].人民长江,2000,31(9):42-44.
[8]俞裕泰,肖明.大型地下洞室围岩稳定三维弹塑性有限元分析[J].岩石力学与工程学报,1987,6(1):47-56.
[9]高玮,冯夏庭,郑颖人.地下工程围岩参数反演的仿生算法及其工程应用研究[J].岩石力学与工程学报,2002,21(增2):2521-2526.
[2]丁德馨,张志军,孙钧.弹塑性位移反分析的遗传算法研究[J].工程力学,2003,20(6):1-5.
[3]刘世君,徐卫东,王红春.不确定性岩石力学参数的区间反分析[J].岩石力学与工程学报,2004,23(6):885-888.
[4]Yang X M,Yuan J S,Yuan J Y,Mao H N.A modi-fied particle swarm optimizer with dynamic adaptation[J].Applied Mathematics and Computation,2007,189:1205-1213.
[5]杨林德.岩土工程问题的反演理论与工程实践[M].北京:科学出版社,1996.
[6]郭凌云.地下洞室开挖扰动支护及围岩参数反馈分析研究[D].武汉:武汉大学,2004.
[7]肖明,刘志明.锦屏二级水电站三维地应力场反演回归分析[J].人民长江,2000,31(9):42-44.
[8]俞裕泰,肖明.大型地下洞室围岩稳定三维弹塑性有限元分析[J].岩石力学与工程学报,1987,6(1):47-56.
[9]高玮,冯夏庭,郑颖人.地下工程围岩参数反演的仿生算法及其工程应用研究[J].岩石力学与工程学报,2002,21(增2):2521-2526.
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