Publications de Gaofeng Zhao | EPFL Graph Search

Particle manifold method (PMM): A new continuum-discontinuum numerical model for geomechanics

Particle manifold method (PMM) is a new extension of the numerical manifold method (NMM). PMM uses a mathematical cover system to describe the motion and deformation of a particle-based physical domain. By introducing the concept of particle into NMM, PMM ...

Wiley-Blackwell2013

Parallelization of the distinct lattice spring model

Jiannong Fang, Jian Zhao, Gaofeng Zhao, Liang Sun

The distinct lattice spring model (DLSM) is a newly developed numerical tool for modeling rock dynamics problems, i.e. dynamic failure and wave propagation. In this paper, parallelization of DLSM is presented. With the development of parallel computing tec ...

Wiley-Blackwell2013

A MLS-based lattice spring model for simulating elasticity of materials

Jiannong Fang, Jian Zhao, Gaofeng Zhao

A MLS-based lattice spring model is presented for numerical modeling of elasticity of materials. In the model, shear springs between particles are introduced in addition to normal springs. However, the unknowns contain only particle displacements but no pa ...

World Scientific Publ Co Pte Ltd2012

A coupled distinct lattice spring model for rock failure under dynamic loads

Jiannong Fang, Jian Zhao, Gaofeng Zhao

It is necessary to take into account the micro discretization of natural rock when studying its macroscopic failure behavior. This requirement has resulted in renewed and increased interest in the discrete or framework/lattice numerical modeling techniques ...

Elsevier2012

Seismic response of a single and a set of filled joints of viscoelastic deformational behaviour

Jian Zhao, Jianbo Zhu, Gaofeng Zhao

Rock joints are often filled with weak medium, for example, saturated clay or sand, of viscoelastic nature. Their effects on wave propagation can be modelled as displacement and stress discontinuity conditions. The viscoelastic behaviour of the filled join ...

Blackwell Publishing Ltd, Oxford2011

Validation study of the distinct lattice spring model (DLSM) on P-wave propagation across multiple parallel joints

Jian Zhao, Jianbo Zhu, Gaofeng Zhao

A validation study of the distinct lattice spring model (DLSM) for wave propagation problems is performed. DLSM is a microstructure-based numerical model, which is meshless and has advantages in modelling dynamic problems where stress wave propagation is i ...

Elsevier2011

A 3D distinct lattice spring model for elasticity and dynamic failure

Jiannong Fang, Jian Zhao, Gaofeng Zhao

Wiley-Blackwell2011

Normally Incident Wave Propagation across One Joint Set with Virtual Wave Source Method

Jian Zhao, Jianbo Zhu, Gaofeng Zhao

This paper presents an analytical study on normally incident wave propagation across a joint set. Combined with the displacement discontinuity method (DDM), the virtual wave source method (VWSM) is adopted to take account of multiple wave reflections among ...

Elsevier2011

Dynamic fracturing simulation of brittle material using the distinct lattice spring method with a full rate-dependent cohesive law

Jian Zhao, Tohid Kazerani, Gaofeng Zhao

A full rate-dependent cohesive law is implemented in the distinct lattice spring method (DLSM) to investigate the dynamic fracturing behavior of brittle materials. Both the spring ultimate deformation and spring strength are dependent on the spring deforma ...

Springer Vienna2010

Development of Micro-Macro Continuum-Discontinuum Coupled Numerical Method

Gaofeng Zhao

A micro-macro and continuum-discontinuum coupled model and corresponding computer codes are developed in this thesis for rock dynamics study. Firstly, a new micromechanical model for describing the elastic continuum based on the underlying microstructure o ...

EPFL2010

Analytical study of S-wave propagation across saturated joints in rock masses

Jianbo Zhu, Gaofeng Zhao

Joints are important mechanical and hydrological features of rock masses, and they can greatly affect wave propagation and attenuation across jointed rock masses. Joints often contain liquid, and the presence of liquid will change the mechanical behaviors ...

Crc Press-Taylor & Francis Group, 6000 Broken Sound Parkway Nw, Ste 300, Boca Raton, Fl 33487-2742 Usa2010

A NUMERICAL MANIFOLD METHOD FOR PLANE MICROPOLAR ELASTICITY

Jian Zhao, Hua Zhang, Gaofeng Zhao

A numerical manifold method (NMM) for plane micropolar elasticity is proposed in this paper to consider the microstructure influence of materials. First, the basic formulations of plane micropolar elasticity are briefly introduced. Then, the equations of s ...

2010

On the truly meshless solution of heat conduction problems in heterogeneous media

Aurèle Parriaux, Jiannong Fang, Jian Zhao, Gaofeng Zhao

A truly meshless method based on the weighted least-squares (WLS) approximation and the method of point collocation is proposed to solve heat conduction problems in heterogeneous media. It is shown that, in the case of strong heterogeneity, accurate and sm ...

2009