Parameter Sensitivity and Inversion Analysis for a Concrete Face Rockfill Dam Based on CS-BPNN

Abstract EN

The deformation behavior of rockfill is significant to the normal operation of concrete face rockfill dam.

Considering both the nonlinear mechanical behavior and long-term rheological deformation, the E-ν model and modified Burgers model are coupled to describe the deformation behavior of the rockfill materials.

The coupled E-ν and Burgers model contains numerous parameters with complex relationship, and an efficient and accurate inversion analysis is in demand.

The sensitivity of the parameters in the coupled E-ν and modified Burgers is analyzed using the modified Morris method initially.

Then, a new approach of parameter back analysis is proposed by combining back-propagation neutral network (BPNN) and Cuckoo Search (CS) algorithm.

The numerical example shows that parameters K, Rf, and φ0 as well as G are more sensitive to the deformation of the rockfill body.

The inversion analysis for these four parameters and η2, E2, and A as well as B in modified Burgers model is performed by the CS-BPNN algorithm.

The numerical results demonstrate that the parameters obtained with the proposed method are reasonable and its feasibility is validated.