Abstract
Stochastic discrete fractures are ubiquitous in practicing engineering and contribute much to the stability for geological mediums. In contrast to the traditional treatments based on continuum mechanics, we propose an integrated approach using discrete fractures based on an improved hybrid finite element method (FEM). A typical jointed rock slop is selected as a case study and then was simulated in the light of geological conditions for the study site. The basic equations of fracture domains are derived to generate stochastic discrete fractures which render a fundamental to the model. To implement this procedure through computer program, discrete fractures generating algorithm was developed. In the aspect of discretization, we presented a meshing scheme and proposed an algorithm to create fracture elements. To evaluate rock slope stability in a quantitative way, safety factor is calculated by strength reduction method. Numerical simulations were carried out showing the mechanical behaviors of jointed rock slope under different boundary conditions.
Highlights
Stochastic discrete fractures are ubiquitous in practicing engineering and contribute much to the stability for geological mediums
To simulate the mechanical behaviors of discrete fractures networks (DFNs) including bedding planes and random fractures which exist in jointed rock slope, an improved hybrid finite element method was employed in this study
It is essential to study the mechanical behaviors of the jointed rock slope during construction period, for which a large load would be applied to the slope surface induced by the bridge foundation
Summary
The mechanical behaviors of fractured mediums, for instance, jointed rock slope, weathered geological body and fractured reservoirs, are mainly controlled by mechanical and hydraulic properties of discrete fractures, which is one of the most typical types of discontinuous surfaces. Stochastic discrete fractures are ubiquitous in this type of region and contribute much to the stability for a geological medium [4,5]. Apart from field investigation and experiments, it is essential developing an effective numerical approach to study the stability of fractured rocks. Numerical simulation for a fractured medium is still a challenge topic in the field of computational mechanics [1,6,7,8]. We mainly focus on the simulation approach about jointed rock slope stability
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