Abstract
High concrete‐face rockfill dams (CFRDs) with heights of over 100 m have been quickly developed in recent years. The self‐weight of rockfill materials causes creep deformation of the dam body. However, the creep analysis method of high CFRDs in finite element software is few, and sometimes, it can also not reflect the long‐term performance of high CFRDs well. Therefore, it is necessary to carry out the secondary development in finite element software. This study developed a subroutine that can run in Finite Element Method (FEM) platform ABAQUS to simulate long‐term creep deformation behavior of the rockfill materials more accurately. Then, a displacement back‐analysis for parameters, based on the Xujixia high CFRD project, is performed by the neural network response surface method (BP‐MPGA/MPGA). Remarkable agreements are observed between simulation and field monitoring results. The calibrated FEM model is used to predict stress and deformation behavior of the Xujixia high CFRD after three years of operation period. The result indicates that rockfill creep deformation has a significant impact on stress and deformation of the high CFRD during the operation. This research may predict long‐term performance using FEM in the design stage for high CFRDs.
Highlights
Concrete-face rockfill dams (CFRDs) have been quickly developed in recent years because of the adaptability to terrain, low cost, and facilitated construction [1]
Is case study focuses on the field monitoring results of Xujixia high CFRD (121.5 m) and developing a subroutine in ABAQUS using exponential decay-type empirical creep model to evaluate creep deformation of high CFRDs. e simulation parameters were determined based on displacement back-analysis (BP-MPGA/MPGA) considering the construction process and field compaction test results
An user-defined material subroutine (UMAT) subroutine in ABAQUS was developed based on exponential decay empirical creep model. e creep parameters were obtained by quasilinearization method (BPMPGA/MPGA) inversion
Summary
Concrete-face rockfill dams (CFRDs) have been quickly developed in recent years because of the adaptability to terrain, low cost, and facilitated construction [1]. In order to obtain the creep model of rockfill for FEM simulations, researchers have conducted large-scale triaxial tests for investigating the time-dependent behavior of coarse granular materials under different stress paths, confining pressures, and moisture contents [28,29,30,31,32,33,34,35,36,37]. According to triaxial test results, theoretical models have been developed to characterize the creep behavior of rockfill materials. Is case study focuses on the field monitoring results of Xujixia high CFRD (121.5 m) and developing a subroutine in ABAQUS using exponential decay-type empirical creep model to evaluate creep deformation of high CFRDs. e simulation parameters were determined based on displacement back-analysis (BP-MPGA/MPGA) considering the construction process and field compaction test results. E effectiveness of the proposed method is validated by field monitoring results of Xujixia high CFRD
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