E. F. Salmi

E. F. Salmi

PhD in Geo-mechanics Engineering

About

30
Publications
9,999
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356
Citations

Publications

Publications (30)
Article
Full-text available
The gas transport infrastructure is frequently localized in areas subjected to anthropogenic movements and strains. The potential impact of the ground movements on the gas pipeline in the aspect of its damage can be properly assessed e.g. by predicting strains, taking into account the causes of terrain movement. On the other hand, the hazard is als...
Article
The collection of sensor-based data is dramatically increased in the mining industry. One of the widely used applications of the collected data is to identify rock domains and to estimate rock mass properties. Rock domaining and classification are usually done by engineers and geologists based on manual downhole logging and using engineering judgme...
Article
Mining as one of the fundamental elements of the economy has left tens of thousands of mines abandoned. With increased urbanisation and population growth, industrial or residential sites become prone to post-mining geotechnical hazards such as subsidence from abandoned mining sites. Instabilities of abandoned workings may, also, interfere with acti...
Article
Full-text available
This study proposes a systematic approach to investigate the geotechnical risks associated with shallow abandoned underground stopes in hard rock environments. The Rock Engineering System, RES, (Hudson 1992b) provides an efficient approach for assessing complex phenomena and interconnected parameters. The method is used, here, to develop an Interac...
Preprint
Full-text available
The gas transport infrastructure is frequently localized in areas subjected to anthropogenic movements and strains. The potential impact of such deformations on the gas pipeline in the aspect of its damaging can be properly assessed by, e.g. by predicting strains, taking into account the causes of terrain movement. On the other hand the hazard is a...
Article
Rockburst is one of the severe geotechnical problems that may occur while tunnelling under high in-situ stresses. Despite numerous studies in the relevant literature, the evaluation and prediction of the rockburst still remain a common challenge worldwide. In this paper, a self-developed combined finite-discrete element method (FDEM) is used to num...
Article
Full-text available
Rock fragmentation by blasting is still among the most challenging of problems in geomechanical engineering. The intent of this work is not to develop a new overall blast fragmentation model as the existing models, like Swebrec (KCO), the Fragmentation-Energy Fan, or the Distribution-Free models, have proven successful. The aim of the study is, how...
Article
One highly effective approach for tunnelling in rock at deep depth is blasting. The damage and in-situ stress redistribution in the surrounding rock mass induced by the blast loading during this process is, however, unavoidable. In this study, a powerful GPGPU-parallelized combined finite-discrete element method is implemented to study the damage e...
Article
A combined finite-discrete element method (FDEM) parallelized on the basis of GPGPU is implemented to model the rock fracture and fragmentation process and the resultant excavation damaged zone (EDZ) development induced by the controlled contour blasting, which was conducted in the TASQ tunnel with high in-situ stresses in the Äspö Hard Rock Labora...
Conference Paper
This study aims at proposing an innovative technique to reliably characterize the rock masses for differential blast design to optimize rock fragmentation. A few key technologies and approaches for acquiring and delivering the required information for blast design are identified and briefly explained. This study shows that proper design of differen...
Article
Full-text available
Underground excavations are naturally under deteriorating environments due to corrosive ground water, type of minerals, and rock mass structures. The abundant of water (e.g., humidity and the inflow of groundwater), and the presence of chemical materials are among the main reasons creating such environments. Rock formations also contain minerals, w...
Article
Assessing the long-term stability of abandoned mine workings is a challenging problem in geo-mechanical engineering. There are several factors contributing to the long-term behaviour of excavations. Creep and the gradual deterioration of rocks are, in particular, among the dominant factors affecting the long-term stability of abandoned mine working...
Conference Paper
Full-text available
To implement the concept of selective blasting, a precise understanding of the distribution of grade and the rock mass geo-mechanical characteristics is needed. The spatial distribution of the rock’s geotechnical characteristics controls the responses of rocks against the dynamic blast loads and subsequently governs the mechanisms of fragmentation....
Article
Full-text available
One of the most important aspects of tunnelling in soft grounds is to reduce any possible adverse environmental impact. That is, pre-supporting techniques are found to boost tunnelling advance speed whilst, at the same time, keeping the environmental consequences due to tunnelling process appreciably low. The umbrella arch method is one of the most...
Article
Post-mining subsidence is a serious problem in urban areas constructed above abandoned mine workings. Subsidence may severely damage the environment and threaten the stability of surface structures and infrastructure. This study aims at analysing the role of gradual weakening of rocks on chimney collapse and sinkhole subsidence formation, in shallo...
Article
Full-text available
Roof collapses during the constructions of underground excavations in weak rocks is a serious problem. In particular, excavations in shallow depths and in incompetent rocks may initiate the caving of the overburden materials and sinkhole formation. Sinkholes have significant environmental impacts and more importantly, they threaten the stability of...
Article
In this study, the effect of gradual deterioration on the long-term stability of shallow abandoned room and pillar coal mines is investigated. The conventional Tributary Area Method is adopted and modified to take into account the rate of deterioration on the lifetime of pillars. Moreover, a simple quantitative approach is proposed to incorporate t...
Article
Mining induced subsidence is one of the challenging problems in geotechnical engineering. The surface topography of the ground over mining excavations plays a key role in the mechanism of subsidence. When a mining operation is performed beneath mountainous or hilly terrain, it may trigger landslides. This study, therefore, aims to analyse the impac...
Article
Full-text available
The expansion of the Neyriz marble mine into deeper levels caused an unexpected failure particularly in the toes of lower benches. This phenomenon can impact the overall stability of the quarry and results in undesirable environmental and technical consequences. To understand the failure mechanism, a comprehensive study including—laboratory testing...
Presentation
Full-text available
https://www.minesurveyors.com.au/files/ISM2016/Presentations/20160913_Tue/B1_2/1100/3_E_Fathi-Salmi.pdf
Presentation
Full-text available
https://www.minesurveyors.com.au/files/ISM2016/Presentations/20160913_Tue/B1_2/1340/4_E_Fathi_Salmi.pdf
Article
In this paper, the mechanism of pre-splitting was analysed using both theoretical and numerical methods. An analytical approach was derived based on the thick-wall cylinder theory. Numerical simulation of pre-split blasting of a two adjacent blast-hole bench was conducted using FLAC3D software. The sequential loading stages of explosive and stress...
Article
Estimating the mechanical properties of a rock mass is an inherently complex task involving numerous uncertainties, especially when performing rock slope stability analysis. Conventional rock mass classification systems with essential adjustments to account for rock discontinuities are a feasible approach to analyzing rock slope stability. Moreover...
Article
One of the main objectives of all blasting operations, in mining, is to achieve good fragmentation. Rock fragmentation by blasting is a complicated process which involves consecutive loading phases. Additionally, the initiation of multiple holes in a blasting operation adds complexity to the process. The intention of this study is to investigate th...

Questions

Questions (5)
Question
I am working on a project related to Mine to Mill optimisation. I would like to predict and incorporate the heterogeneity of fragmentation in the associated analyses. The question, however, is that how we can incorporate the three-dimensionality of the problem in fragmentation prediction? Is there any approach available to predict the gradation of the rock fragment size distribution due to energy partitioning, the network of natural fractures, and stemming effects? Any idea is highly welcome.
Question
The finer the particles’ sizes, the more their exposed surfaces. This can affect the rate of chemical leaching.
Is any well-established formula available to quantitatively show the relationships between the rate / efficiency of dump leaching and the PSD of the ROM?
Question
Dose the Particle Size Distribution, PSD, of the products of Jaw and Gyratory crushers depend on the feed PSD?
The technical manuals of some crushing machines show that PSD of the products is just a function of the machine characteristics (e.g., Open and Close Side Settings).
Literature also shows that the Witthen’s Classification – Breakage model is widely used to estimate the PSD of the crushers’ products. How the breakage matrix is generated in this model?

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Projects

Projects (6)
Project
What would be the main features of the smart mines of the future? Are the conventional mining methods capable of addressing all the progressively restricting ESG obligations or is there a need for a transformation in the mining methods?
Project
The scope of the project is to develop a guideline for the design of ore passes in complex geological and geotechnical conditions.
Project
To develop a three-dimensional fragmentation model for the prediction of rock fragmentation in ring blasting for underground metal mining