Inversion uniqueness of elastic displacement back-analysis for ground stress,elastic modulus and Poisson's ratio
Inversion uniqueness of elastic displacement back-analysis for ground stress,elastic modulus and Poisson's ratio
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发表时间：
2001
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通讯作者：
Zhang Lu-qing
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作者：
Zhang Lu-qing
地应力的竖向、水平和剪切分量、弹性模数和泊松比是地下工程平面问题的五个重要参数。本文利用单洞的位移解析解，对由位移进行弹性反分析可能识别的参数个数进行了进一步的研究，发现当所有地应力分量和弹性模数都是需要反分析的未知参数时，反演结果不是唯一的。此外，所有未知参数都有可能被反演出，只是对于几何形状简单的隧道，反演对待识别参数的限制较大。
Vertical,horizontal and shear components of ground stress,elastic modulus and Poisson's ratio are five important parameters for plane problems of underground engineering.The present paper makes further investigations about the number of the parameters that are possibly identified by the elastic back-analysis from displacements,using the analytic displacement solution of a single tunnel.It is found that the inversion isn't unique when all ground stress components and elastic modulus are unknown parameters to be back-analyzed.Besides this case,all the unknown parameters are possibly inverted only that the inversion for tunnel with simple geometry places more limits on the parameters to be identified.