DDA validation of the mobility of earthquake-induced landslides

Zhang, Yingbin; Wang, Jinmei; Liu, Fangzhou; Chen, Guangqi; Zhao, John X.; Zheng, Lu; Han, Zheng; Zhang, Yingbin

doi:10.1016/j.enggeo.2014.08.024

Cited by 134 publications

(22 citation statements)

References 98 publications

(110 reference statements)

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“…where n and n + 1 are the DDA calculation time steps, β and γ are the parameters of Newmark method, and Δt is the interval time step. Next, substituting formulas (4) and (5) into (3) with a time step of n + 1,…”

Section: Motion Equations Of a Block System Based On The Newmark Methodsmentioning

confidence: 99%

Boundary setting method for the seismic dynamic response analysis of engineering rock mass structures using the discontinuous deformation analysis method

Sheng

Zhang

et al. 2015

Int. J. Numer. Anal. Meth. Geomech.

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SUMMARYLarge deformations and discontinuous problems can be calculated using the discontinuous deformation analysis (DDA) method by solving time steps, and this method is suitable for simulating the seismic dynamic response of engineering rock mass structures. However, the boundary setting must be carefully analyzed. In this paper, four boundary settings for the DDA method are investigated. First, the contributions to the DDA equations for nonreflecting boundaries (including the viscous boundary and the viscoelastic boundary) are deduced based on the Newmark method. Second, a free-field boundary is introduced in the DDA method with boundary grid generation and coupling calculation algorithms to accurately simulate external source wave motion, such as earthquakes. Third, seismic input boundary treatments are intensively examined, and the force input method is introduced based on nonreflecting boundaries. Finally, the staticdynamic unified boundary is implemented to ensure consistent boundary transformation. The boundary setting method in the DDA method is discussed, and the suggested treatments are used to analyze the seismic dynamic response of underground caverns.

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Section: Motion Equations Of a Block System Based On The Newmark Methodsmentioning

confidence: 99%

Boundary setting method for the seismic dynamic response analysis of engineering rock mass structures using the discontinuous deformation analysis method

Sheng

Zhang

et al. 2015

Int. J. Numer. Anal. Meth. Geomech.

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“…Landslides are often triggered by strong earthquakes (Zhang et al 2015). These earthquake-induced landslides are a kind of dynamic process reshaping landscape,…”

Section: Introductionmentioning

confidence: 99%

Noncontact detection of earthquake-induced landslides by an enhanced image binarization method incorporating with Monte-Carlo simulation

Han

et al. 2018

Geomatics, Natural Hazards and Risk

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Detecting landslides using remote sensing images involves converting gray level images into binary images. Given the complex background and non-uniform illumination in the regional remote sensing image, the commonly-used global thresholding methods are limited to interpret some landslides those hidden in the shadow. In this paper, we report on an enhanced image thresholding method for the noncontact detection of earthquake-induced landslides. The proposed method incorporates Monte-Carlo simulation into the local thresholding method, and essential issues, regarding complex illumination condition and uncertainties of determining block size in local thresholding method, are addressed. To better separate landslide candidate objects from the background, we incorporate Digital Surface Model (DSM) into the binary image, such that the interferences by built-up areas, terraces, and rivers can be significantly reduced considering the indicator of slope gradient. The described method has been tested using two benchmark tests, showing that the proposed method performs well dealing with the complex background and illumination condition. As a case study, we use the proposed method to detect landslides in a remote sensing image near Beichuan area after the 2008 Ms8.0 Wenchuan earthquake. Results demonstrate that the presented method interprets landslides resembling those of manually visual delineation.

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“…This method has been applied to numerical simulations of many major projects in several fields . However, the DDA method has been proved to be time‐consuming for special cases, for example, computation of a notably large number of blocks , simulation of rock fracture and dynamic time‐history analysis of the blasting or seismic problem , which has greatly hindered the use of this method in the engineering simulations. Thus, improvement of the computational efficiency of the DDA method is critical and is the focus of this paper.…”

Section: Introductionmentioning

confidence: 99%

Investigation of highly efficient algorithms for solving linear equations in the discontinuous deformation analysis method

Sheng

Zhang

et al. 2015

Num Anal Meth Geomechanics

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Large-scale engineering computing using the discontinuous deformation analysis (DDA) method is timeconsuming, which hinders the application of the DDA method. The simulation result of a typical numerical example indicates that the linear equation solver is a key factor that affects the efficiency of the DDA method. In this paper, highly efficient algorithms for solving linear equations are investigated, and two modifications of the DDA programme are presented. The first modification is a linear equation solver with high efficiency. The block Jacobi (BJ) iterative method and the block conjugate gradient with Jacobi preprocessing (Jacobi-PCG) iterative method are introduced, and the key operations are detailed, including the matrix-vector product and the diagonal matrix inversion. Another modification consists of a parallel linear equation solver, which is separately constructed based on the multi-thread and CPU-GPU heterogeneous platforms with OpenMP and CUDA, respectively. The simulation results from several numerical examples using the modified DDA programme demonstrate that the Jacobi-PCG is a better iterative method for largescale engineering computing and that adoptive parallel strategies can greatly enhance computational efficiency. Figure 17. Parallel speedup factor of the discontinuous deformation analysis models with multi-thread and CPU-GPU platforms. 484X. FU ET AL.

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DDA validation of the mobility of earthquake-induced landslides

Cited by 134 publications

References 98 publications

Boundary setting method for the seismic dynamic response analysis of engineering rock mass structures using the discontinuous deformation analysis method

Boundary setting method for the seismic dynamic response analysis of engineering rock mass structures using the discontinuous deformation analysis method

Noncontact detection of earthquake-induced landslides by an enhanced image binarization method incorporating with Monte-Carlo simulation

Investigation of highly efficient algorithms for solving linear equations in the discontinuous deformation analysis method

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