Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- [RSTDPub] (8)
- Wettability (4)
- Critical state (3)
- Chemical corrosion (2)
- Compressive strength (2)
-
- Earthquakes (2)
- Geosynthetics (2)
- Hoek-Brown (H-B) criterion (2)
- Hydrogen geo-storage (2)
- Machine learning (2)
- Methylene blue (2)
- Mohr–Coulomb (M-C) criterion (2)
- Organic acid (2)
- Organic acids (2)
- Permeability (2)
- Rock brittleness (2)
- Sandstone formation (2)
- Stearic acid (2)
- Alumina nanofluids (1)
- Anisotropic hydraulic conductivity (1)
- Artificial intelligence (AI) (1)
- Artificial neural network (ANN)-Harris hawks' optimisation (HHO) (1)
- Bearing capacity (1)
- Beta titanium alloy (1)
- Biochar (1)
- Box–Behnken design (1)
- Brittle to ductile (1)
- Brittle-ductile transition (1)
- CO sequestration 2 (1)
- CO 2 trapping capacities (1)
- Publication Year
- Publication
- Publication Type
Articles 31 - 45 of 45
Full-Text Articles in Geotechnical Engineering
A New Volumetric Strain-Based Method For Determining The Crack Initiation Threshold Of Rocks Under Compression, Hao Li, Ruizhi Zhong, Leo Pel, David Smeulders, Zhenjiang You
A New Volumetric Strain-Based Method For Determining The Crack Initiation Threshold Of Rocks Under Compression, Hao Li, Ruizhi Zhong, Leo Pel, David Smeulders, Zhenjiang You
Research outputs 2022 to 2026
The crack initiation stress threshold ( ci) is an essential parameter in the brittle failure process of rocks. In this paper, a volumetric strain response method (VSRM) is proposed to determine the σci based on two new concepts, i.e., the dilatancy resistance state index ( ci) and the maximum value of the dilatancy resistance state index difference (| ci|), which represent the state of dilatancy resistance of the rock and the shear sliding resistance capacity of the crack-like pores during the compressive period, respectively. The deviatoric stress corresponding to the maximum | ci| is taken as the ci . We …
A Progress Insight Of The Formation Of Hydrogen Rich Syngas From Coal Gasification, Tawanda Matamba, Stefan Iglauer, Alireza Keshavarz
A Progress Insight Of The Formation Of Hydrogen Rich Syngas From Coal Gasification, Tawanda Matamba, Stefan Iglauer, Alireza Keshavarz
Research outputs 2022 to 2026
This review paper aims to explore the research progress in the formation of hydrogen rich gas from different innovative coal gasification parameters. Promotion effects of parameters such as pressure, temperature, catalyst, coal type, reactor setup, and gasification agents (H2O, O2, supercritical water) were extensively analysed. The formation of hydrogen gas through coal gasification was sub-divided into H2 production from fixed bed gasification system, fluidized bed system, and entrained flow system. The advantages of coal and biomass co-gasification towards clean energy formation was also reviewed. Co-gasification and elevated temperatures, pressures, and steam-carbon ratios were reported to positively influence the yields of …
The Influence Of Acidizing On Propped Fractures For Productivity Enhancement: Eagle Ford Laboratory Study, Mohsen Farrokhrouz, Abbas Taheri, Stefan Iglauer, Alireza Keshavarz
The Influence Of Acidizing On Propped Fractures For Productivity Enhancement: Eagle Ford Laboratory Study, Mohsen Farrokhrouz, Abbas Taheri, Stefan Iglauer, Alireza Keshavarz
Research outputs 2022 to 2026
Hydraulic fracturing of tight formations and placing proppants within induced fractures are commonly performed in unconventional shale reservoirs all over the world, especially in North America. However, the overall recovery of these oil and gas resources is very low and hence, production enhancement is inevitable. This study investigated the acidizing of propped fractures as a recovery enhancement method in Eagle Ford shale samples. Experiments were designed using sample slabs having proppants between them. Differing parameters were examined to optimize the fracture conductivity through acidizing. For a range of confining pressures, the fracture conductivity was maximized by minimizing the proppant embedment. …
Effect Of Biochar On Desiccation Of Marine Soils Under Constant And Cyclic Temperatures, Thellen Kumar Puspanathan, Vihan Shenal Jayawardane, Suvash Chandra Paul, Kong Sih Ying, Sanjay Kumar Shukla, Vivi Anggraini
Effect Of Biochar On Desiccation Of Marine Soils Under Constant And Cyclic Temperatures, Thellen Kumar Puspanathan, Vihan Shenal Jayawardane, Suvash Chandra Paul, Kong Sih Ying, Sanjay Kumar Shukla, Vivi Anggraini
Research outputs 2022 to 2026
Biochar has recently been gaining increasing attention as a stable and sustainable soil amendment material. However, the effect of biochar amendment on the desiccation behaviour of coastal soils has not yet been examined. Consequently, the present study primarily investigated the effect of exposing biochar-amended marine soil (BAS) to constant and cyclic temperatures on its swell–shrink, evaporation and desiccation cracking characteristics. Biochar contents of 1%, 2%, 4% and particle size ranges of PS-1 (600 μm < D ≤ 2000 μm), PS-2 (300 μm < D ≤ 600 μm), PS-3 (D ≤ 75 μm) (D: biochar particle diameter) were employed. It was revealed that the absolute volumetric shrinkage of both unamended and biochar-amended specimens increased as the number of thermal cycles increased. Under continuous heat exposure, 4% (PS-3) BAS in compacted state achieved the maximum reduction in volumetric shrinkage which was 42%. Moreover, under continuous heat exposure, 2% (PS-1) BAS in slurry state achieved the highest reduction in desiccation cracking, which was 73%. The present study highlights the importance of identifying the most effective combination of biochar content and particle size required to achieve a desired outcome, in order to gain the maximum benefit of biochar as an amendment material at the lowest possible cost.
Influence Of Rock Wettability On Thf Hydrate Saturation And Distribution In Sandstones, Ghazanfer Raza Abbasi, Ahmed Al-Yaseri, Abubakar Isah, Alireza Keshavarz, Sefan Iglauer
Influence Of Rock Wettability On Thf Hydrate Saturation And Distribution In Sandstones, Ghazanfer Raza Abbasi, Ahmed Al-Yaseri, Abubakar Isah, Alireza Keshavarz, Sefan Iglauer
Research outputs 2014 to 2021
Natural gas trapped in hydrate deposits is a potentially enormous source of energy which can in principle be extracted from the underground reservoir structures. These reserves can potentially also catastrophically release very large quantities of greenhouse gases to the atmosphere. One key parameter which is well known to strongly influence fluid distribution, saturation, and production is rock wettability. However, the effect of wettability on gas hydrate in sediments has not been investigated yet. We thus used nuclear magnetic resonance (NMR) spectrometry to measure relaxation times (T2 and T1) and the corresponding surface relaxivity of tetrahydrofuran hydrate …
Experimental Study On Repeatedly Loaded Foundation Soil Strengthened By Wraparound Geosynthetic Reinforcement Technique, Muhammad Nouman Amjad Raja, Sanjay K. Shukla
Experimental Study On Repeatedly Loaded Foundation Soil Strengthened By Wraparound Geosynthetic Reinforcement Technique, Muhammad Nouman Amjad Raja, Sanjay K. Shukla
Research outputs 2014 to 2021
In the recent past, the potential benefits of wraparound geosynthetic reinforcement technique for constructing the reinforced soil foundations have been reported. This paper presents the experimental study on the behaviour of model strip footing resting on sandy soil bed reinforced with geosynthetic in wraparound and planar forms under monotonic and repeated loadings. The geosynthetic layers were laid according to the reinforcement ratio to minimise the scale effect. It is found that for the same amount of reinforcement material, the wraparound reinforced model resulted in less settlement in comparison to planar reinforced models. The efficiency of wraparound reinforced model increased with …
Influence Of Diagenetic Features On Petrophysical Properties Of Fine-Grained Rocks Of Oligocene Strata In The Lower Indus Basin, Pakistan, Abdul Majeed Shar, Aftab Ahmed Mahesar, Ghazanfer Raza Abbasi, Asad Ali Narejo, Asghar Ali Alias Daahar Hakro
Influence Of Diagenetic Features On Petrophysical Properties Of Fine-Grained Rocks Of Oligocene Strata In The Lower Indus Basin, Pakistan, Abdul Majeed Shar, Aftab Ahmed Mahesar, Ghazanfer Raza Abbasi, Asad Ali Narejo, Asghar Ali Alias Daahar Hakro
Research outputs 2014 to 2021
Nari Formation is considered as one of the most important oil and gas exploration targets. These fine-grained tight sandstone reservoirs face enormous challenges due to their extremely low matrix porosity and permeability. Hence, in this regard, the study was carried out to collect the high-quality data on petrophysical properties along with mineralogy and microstructural characteristics and diagenesis. The experiments performed includes the petrographic study and scanning electron microscopy, and X-ray diffraction analyses. Besides, the measurement of petrophysical properties was carried out to assess the likely influence of the reservoir quality. The petrographic analysis shows predominantly fine- to medium-grained grey samples …
Predicting The Settlement Of Geosynthetic-Reinforced Soil Foundations Using Evolutionary Artificial Intelligence Technique, Muhammad Nouman Amjad Raja, Sanjay K. Shukla
Predicting The Settlement Of Geosynthetic-Reinforced Soil Foundations Using Evolutionary Artificial Intelligence Technique, Muhammad Nouman Amjad Raja, Sanjay K. Shukla
Research outputs 2014 to 2021
In order to ensure safe and sustainable design of geosynthetic-reinforced soil foundation (GRSF), settlement prediction is a challenging task for practising civil/geotechnical engineers. In this paper, a new hybrid technique for predicting the settlement of GRSF has been proposed based on the combination of evolutionary algorithm, that is, grey-wolf optimisation (GWO) and artificial neural network (ANN), abbreviated as ANN-GWO model. For this purpose, the reliable pertinent data were generated through numerical simulations conducted on validated large-scale 3-D finite element model. The predictive power of the model was assessed using various well-established statistical indices, and also validated against several independent scientific …
Hydrogen Wettability Of Sandstone Reservoirs, Stefan Iglauer, Muhammad Ali, Alireza Keshavarz
Hydrogen Wettability Of Sandstone Reservoirs, Stefan Iglauer, Muhammad Ali, Alireza Keshavarz
Research Datasets
Data set include the data for contact angle data as a function of pressure, temperature and stearic acid concentration in H2. One exemplary figure is also provided for contact angle measurement in H2 atmosphere.
Co 2 -Wettability Of Sandstones Exposed To Traces Of Organic Acids: Implications For Co 2 Geo-Storage, Muhammad Ali, Muhammad Arif, Muhammad Faraz Sahito, Sarmad Al-Anssari, Alireza Keshavarz, Ahmed Barifcani, Linda Stalker, Mohammad Sarmadivaleh, Stefan Iglauer
Co 2 -Wettability Of Sandstones Exposed To Traces Of Organic Acids: Implications For Co 2 Geo-Storage, Muhammad Ali, Muhammad Arif, Muhammad Faraz Sahito, Sarmad Al-Anssari, Alireza Keshavarz, Ahmed Barifcani, Linda Stalker, Mohammad Sarmadivaleh, Stefan Iglauer
Research outputs 2014 to 2021
Wettability of CO 2 -brine-mineral systems plays a vital role during geological CO 2 -storage. Residual trapping is lower in deep saline aquifers where the CO 2 is migrating through quartz rich reservoirs but CO 2 accumulation within a three-way structural closure would have a high storage volume due to higher CO 2 saturation in hydrophobic quartz rich reservoir rock. However, such wettability is only poorly understood at realistic subsurface conditions, which are anoxic or reducing. As a consequence of the reducing environment, the geological formations (i.e. deep saline aquifers) contain appreciable concentrations of various organic acids. We thus demonstrate …
Taylor's Slope Stability Chart For Combined Effects Of Horizontal And Vertical Seismic Coefficients, Pragyan Sahoo, Sanjay Kumar Shukla
Taylor's Slope Stability Chart For Combined Effects Of Horizontal And Vertical Seismic Coefficients, Pragyan Sahoo, Sanjay Kumar Shukla
Research outputs 2014 to 2021
Design standards and codes of practice on earth slope stability often recommend the pseudo-static method of analysis for determining the factor of safety of a slope subjected to seismic forces. In most pseudo-static methods of analysis, the horizontal seismic force is considered without due weightage to vertical seismic force. In the past, Taylor's stability chart for a homogeneous cohesive-frictional soil slope has been extended to consider the effect of horizontal seismic force only. In this paper, an attempt is made to develop an analytical formulation considering both horizontal and vertical seismic forces in order to estimate the factor of safety …
Stability Analysis And Design Charts For A Sandy Soil Slope Supporting An Embedded Strip Footing, Emmanuel Baah-Frempong, Sanjay Kumar Shukla
Stability Analysis And Design Charts For A Sandy Soil Slope Supporting An Embedded Strip Footing, Emmanuel Baah-Frempong, Sanjay Kumar Shukla
Research outputs 2014 to 2021
In several field situations, especially in the hilly terrains, the construction of footings on slopes becomes essential. The factor of safety of a slope supporting a loaded footing on the crest is dependent on the position of the footing from the crest edge. Most studies in the past have focused on analysing the bearing capacity and settlement behaviour of a footing resting on a slope crest, but foundations in most infrastructure projects are usually built at some depth below the ground surface. Therefore, the availability of some form of design charts for determining the factor of safety of a slope …
Resistivity Profiles Of Perth Soil In Australia In Leak-Detection Test, Lopa M. Pandey, Sanjay K. Shukla, Daryoush Habibi
Resistivity Profiles Of Perth Soil In Australia In Leak-Detection Test, Lopa M. Pandey, Sanjay K. Shukla, Daryoush Habibi
Research outputs 2014 to 2021
The use of a suitable leak-detection system for the prevention and mitigation of pollution due to lining system failures is integral to the proper management of landfill facilities. This paper briefly summarises various methods of leak detection that are currently being practised. The details of a newly developed leak-detection technique are also presented. The tests were conducted to evaluate the performance of the new technique by use of controlled leakage. The resulting resistivity profiles for Perth soil in Australia were obtained at 10 min. This method is found to be effective in detecting and locating liner leakage issues within 30 …
Earthquake Load Attenuation Using Eps Geofoam Buffers In Rigid Wall Applications, Richard J. Bathurst, S Zarnani
Earthquake Load Attenuation Using Eps Geofoam Buffers In Rigid Wall Applications, Richard J. Bathurst, S Zarnani
Research outputs 2013
The paper is a synthesis of previously published work by the authors that is focused on the use of expanded polystyrene (EPS) geofoam buffers for seismic load attenuation against rigid basement and soil retaining walls. The paper begins with a brief description of the first documented field application followed by a description of physical 1 m-high reduced-scale shaking table tests that provided the first "proof of concept". Next, details of the development and verification of a displacement-based model and a FLAC numerical model are described and simulation results that were verified against the physical shaking table tests presented. The numerical …
The Simulation Of Material Types In A Western Australian Iron Deposit, Jacqueline Ferreira
The Simulation Of Material Types In A Western Australian Iron Deposit, Jacqueline Ferreira
Theses: Doctorates and Masters
Geostatistical methods are currently used by mining companies to determine a resource model of the tonnage and head grade that may be obtained from a potential orebody, making it one of the first and most vital operational stages in any mining project. Currently long term mine planning is based on the estimated head grades model, which provides vital information on the quality of the ore. The risks associated with mining a particular ore may be reduced if geometallurgical information, such as material types, is incorporated into the operational flow model. Material type proportions are obtained from evaluated reverse circulation (RC) …