Wei Jiang

• Doctor of Engineering
• Professor at China Three Gorges University

In this work, a complex isotropic damage mechanics structural model is developed using the isogeometric method to study the strain displacement and influence factors in isotropically damaged elastics. The proposed modeling method can be constructed dynamically by introducing control points and weight coefficients, which improves the accuracy and el...

We propose an e cient isogeometric boundary element method to address the coupling of heat conduction and radiation in homogeneous or inhomogeneous materials. e isogeometric boundary element method is used to construct irregular 2D models, which eliminate errors in model construction. e physical unknowns in the governing equations for heat conducti...

To avoid disadvantages caused by rotational degrees of freedom in the original Discontinuous Deformation Analysis (DDA), a new block displacement mode is defined within a time step, where displacements of all the block vertices are taken as the degrees of freedom. An individual virtual element space V 1(Ω) is defined for a block to illustrate disp...

This study improved two parts of the virtual element method (VEM) to ensure that the stability of a stony soil slope, especially under excavation conditions, could be better studied. One of the improvements was the specific realization of the excavation algorithm, including the determination of how to identify polygonal elements that needed to be e...

The rotation degree of freedom in discontinuous deformation analysis may cause false volume expansion when a block undergoes a large rotation. We propose a block displacement function to prevent this defect. Specifically, the degrees of freedom in a block are redefined by incremental displacements at its vertices, and displacement is formulated bas...

The first-order displacement function of the original discontinuous deformation analysis (DDA) results in uniform stress within each block, and existing remedies to obtain a stress distribution for each block cause the number of contacts to increase. To remedy this issue, a mean value coordinate-based DDA (Mvc-DDA) approach is proposed for 2D in th...

In the original discontinuous deformation analysis (DDA) method, the complete first-order displacement function is used to describe block movement and deformation, which induce constant stress and strain throughout the block. To achieve a more detailed stress distribution, Wachspress interpolation displacement function is employed to express the di...

The reliability of a computer program simulating rockfall trajectory depends on the ascertainment of reasonable values for the coefficients of restitution, which typically vary with the kinematic parameters and terrain conditions. The effects of the impact angle on the coefficients of restitution have been identified and studied using laboratory ex...

On the basis of the Boussinesq unsteady seepage differential equation, a new simplified formula for the phreatic line of slopes under the condition of decreasing reservoir water level is derived by means of the Laplacian matrix and its inverse transform. In this context, the expression of normal stress on the slip surface under seepage forces is de...

The advantage of 3D discontinuous deformation analysis (3D DDA) is the rigorous contact conditions on the interaction of 3D blocks. These conditions are enforced by the penalty function convention; however, inappropriate penalty parameters easily generate numerical instability. To avoid the introduction of the penalty parameters, the contact condit...

To increase the total power output of the Three Gorges Hydropower Station and generate greater economic benefits, it is necessary to reduce the time required for the water level of the Three Gorges Reservoir to drop, i.e., to increase the rate at which the water level drops. A rapid drop in the reservoir water level might result in a significant ch...

By combining the numerical stability of the global analysis method and the flexibility of the Morgenstern-Price method, a global procedure for the stability analysis of slopes is developed. Firstly, based on the Morgenstern-Price assumption of inter-slice forces, an expression for the distribution of normal stress on the sliding surface is derived....

When the limit-equilibrium method is employed in the stability assessment of complicated landslides, some eccentric results are often encountered with the use of rigorous methods. These eccentric results may be attributable to irrationally assumed interslice forces. Furthermore, engineers should verify the rationality of the thrust-line position in...

Although the constant strain mode of blocks assumed in the conventional discontinuous deformation analysis is sufficient for most applications in geotechnical engineering, a false volume expansion will occur in the presence of large block rotation. By introducing higher-order approximation to the displacements, the existing remedies can mitigate th...

It is well known that the hydraulic drag force on objects cant be ignored in computing the movement of objects in water. And the drag forces on sphere and cuboids have long been studied. While in hydraulic engineering, objects with regular tetrahedron shape are widely used to form the foundation and temporary dam for they can interlock each other t...

The stability of soil slope is a common engineering problem and many scholars and experts have done abundant works on it since 1940s. By utilizing limit equilibrium equations, some slice methods had been proposed to search the most dangerous sliding surface, and they obtain enormous success. This article focuses on the fact that residual sliding fo...

As a common method in rock excavation, blasting causes some adverse effect on rock and supporting structure nearby the explosive hole, such as the influence on fresh concrete at adjacent underground chambers. In this paper blasting load is treated equivalently firstly, then Discontinuous Deformation Analysis (DDA) method is amended to resolve this...

In the conventional discontinuous deformation analysis (DDA) method, the contact conditions are enforced by the penalty function method. Improperly selected penalty parameters might cause numerical problems. In order to evade the introduction of the penalty parameters and to avoid ‘open-close iteration’ that can not assure convergence, this study r...

Rockfall is a frequent engineering disaster confronted by constructions in mountain areas. The design of preventive structure is based on the evaluation of the rockfall trajectory. So it is very important to properly calculate the rockfall trajectory. The discontinuous deformation analysis (DDA) is introduced to solve this problem. According to num...

In the setting of the three-dimensional limit equilibrium method, a procedure for bounding the factor of safety is proposed under the constraint of the reasonable conditions on the system of forces suggested by Morgenstern and Price. No assumption is made regarding the internal forces but the system of forces resulted from the procedure satisfies t...

The contact between blocks is treated by the open-close iteration in the conventional discontinuous deformation analysis (DDA), which needs to introduce spurious springs between two blocks in contact and to assume the normal stiffness and the tangential stiffness (the penalty factors). Unreasonable values of stiffness would result in numerical prob...