摘要
在洞室黏弹性位移参数反分析中,对分层优化方法存在初始值选取困难、计算量大等问题进行了探讨,提出了基于最小二乘法的模式分层运算方法,改变参数求解机制,避免了由于初始值选取不当造成迭代不收敛的现象,加强了求解搜索的有效性,提高解的精度和稳定性,通过工程实例进行验证。数值计算结果表明,模式分层运算对洞室黏弹性多参数位移反分析计算的结果真实、可靠。
There are some thorny problems such as uncertainty and instability solution produced by initial parameters when hierarchical optimization is applied to the viscoelastic cavern displacement in parameter inversion. A simple search method is used in the hierarchical optimization. The hierarchical pattern search is provided to solve these problems. A new method has some computing strategies based on least-square method, which can avoid iterative non-convergence when initial parameters are not optimally selected. Numerical results show that the hierarchical pattern search is nearly independent of the original value; and the method has high accuracy and validity for the viscoelastic cavern displacements of parameter inversion.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第3期967-970,共4页
Rock and Soil Mechanics
基金
国家自然科学基金(No40672194)
高等学校博士学科点基金(No20060558060)
广东省自然科学基金重点项目(No06104932)
关键词
洞室变形监测
位移反分析
分层优化
模式搜索
deformation monitoring of cavern
displacement back analysis
hierarchical optimization
pattern search
