论文标题
在机械化隧道中应用的频域中的弹性波形反演
Elastic waveform inversion in the frequency domain for an application in mechanized tunneling
论文作者
论文摘要
机械化隧道的发掘过程可以通过侦察地质来改善。可以通过地震成像来实现无损的探索。研究了在频域中起作用的完整波形反演方法，用于在隧道中应用。该方法试图通过更改地面特性来最大程度地减少现场观测和离散地面模型的地震记录差异。最终的地面模型可能是地质学的代表。描述了使用的弹性波建模方法以及卷积完美匹配的层的应用。提出的反转方案使用离散的伴随梯度方法，一种多尺度方法以及L-BFGS方法。确定数值参数以及向前波建模方法的验证，以预先为每个示例的反转执行。进行和分析了两种不同的地面场景，并具有两个不同的源和接收器站配置，仅提供地震记录，源函数和环境地面特性，进行了两个不同的源和接收器站配置。最后，对三维隧道模型进行了反转，并分析了三种不同的源和接收站配置的反转。
The excavation process in mechanized tunneling can be improved by reconnaissance of the geology ahead. A nondestructive exploration can be achieved in means of seismic imaging. A full waveform inversion approach, which works in the frequency domain, is investigated for the application in tunneling. The approach tries to minimize the difference of seismic records from field observations and from a discretized ground model by changing the ground properties. The final ground model might be a representation of the geology. The used elastic wave modeling approach is described as well as the application of convolutional perfectly matched layers. The proposed inversion scheme uses the discrete adjoint gradient method, a multi-scale approach as well as the L-BFGS method. Numerical parameters are identified as well as a validation of the forward wave modeling approach is performed in advance to the inversion of every example. Two-dimensional blind tests with two different ground scenarios and with two different source and receiver station configurations are performed and analyzed, where only the seismic records, the source functions and the ambient ground properties are provided. Finally, an inversion for a three-dimensional tunnel model is performed and analyzed for three different source and receiver station configurations.
