Azm S Al-Homoud | Massachusetts Institute of Technology (MIT) (original) (raw)
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Papers by Azm S Al-Homoud
Natural Hazards, Jul 1, 1995
Environmental & Engineering Geoscience, Sep 1, 1995
Lagoons were constructed within colluvial deposits in an area of 140,000 m2 as part of Wadi Es-Si... more Lagoons were constructed within colluvial deposits in an area of 140,000 m2 as part of Wadi Es-Sir Sewage Treatment Plant Project in Jordan. The site has been excavated into steps and risers to construct the lagoons. A major noncircular slope failure occurred in October 1993 on the upper slope of the middle lagoon, resulting in an interruption of construction. Field and laboratory investigations were conducted to identify various geomorphologic zones, stratigraphy and geotechnical properties of all materials encountered at the site. Slope stability back analysis of failed slope was carried out using the 2-D limiting equilibrium Simplified Janbu method. Also, stability analysis was carried out for existing and improved conditions for all lagoons. Dry, partially saturated and fully saturated conditions were considered in the analysis. Pseudostatic stability analysis of the slopes was carried out considering a horizontal bedrock Peak Ground Acceleration (PGA) value of 0.2 g, evaluated at the site using a line source probabilistic seismic hazard assessment model incorporated in the computer program FRISK (McGuire, 1978). The study showed that the failure occurred through colluvial material due to the removal of a large amount of such materials near the toe of the slope during construction of the lagoon. The location of the slip surface was between 8 to 12 m in depth. Effective residual shear strength parameters along the failure plane were found to be: angle of friction (ϕ′) = 17°, and cohesion (c′) = 0.05 kg/cm2. Stability conditions for slopes at all lagoon sites were found to be unacceptable. Recommended measures to stabilize the slopes include replacing (partially or fully) the existing colluvial materials with free-drained rockfill to reach acceptable factors of safety under design conditions. These measures were implemented at the site.
Soil Dynamics and Earthquake Engineering, 1995
Natural Hazards, Mar 1, 1995
Engineering Geology, Aug 1, 1997
Environmental & Engineering Geoscience, Jun 1, 1995
Updated seismic hazard maps have been prepared based on a probabilistic approach for Jordan in ge... more Updated seismic hazard maps have been prepared based on a probabilistic approach for Jordan in general and for Karak City specifically using the line source model. A new earthquake catalogue covering the period from 1 a.d. to 1992 a.d. is used, which includes all events that occurred in Jordan and adjacent areas, covering an area between latitudes 27.0°–35.5° and longitude 32.0°–39.0°E. Ten seismic sources were identified in the assessment of the seismic hazard maps. These are the Aqaba Gulf fault, Wadi Araba fault, Dead Sea fault, Northern fault, Southeast Mediterranean fault, Farah and Carmel fault, Wadi Sirhan fault, Karak-Fayha fault, Suez Gulf fault, and Cyprus zone fault. The peak ground acceleration (PGA) is selected as a measure of the ground motion severity. A suitable attenuation equation (Esteva, 1974) reported in the literature is selected for PGA computations. The computations are carried out using the FRISK computer program. The seismic maps corresponding to a 90 percent probability of not being exceeded are presented for a lifetime of structures for 50,100 and 200 years.
International Journal of Environmental Technology and Management, 2005
Journal of Geotechnical and Geoenvironmental Engineering, Aug 1, 1997
Natural Hazards, Jul 1, 2004
Journal of Geotechnical Engineering, Jul 1, 1995
This paper investigates the effect of cyclic wetting and drying on the expansive characteristics ... more This paper investigates the effect of cyclic wetting and drying on the expansive characteristics of clays. For this purpose, six expansive soils were obtained from various locations in Irbid (a city in northern Jordan). After each cycle, the swell potential and swell pressure were ...
Applied Clay Science, Dec 1, 1996
Environmental geology, Apr 16, 1997
Geotechnical and Geological Engineering, Jun 1, 2006
The study is concerned with the influence of various factors on vibro compaction in calcareous so... more The study is concerned with the influence of various factors on vibro compaction in calcareous soils, This include effect of carbonate content, and influence of pore water pressures in sand, settlements during vibrocompaction, vibroaccelerations during sand column installation compared to earthquake accelerations and finally the liquefaction design based on average CPT parameters. Previous experiences with calcareous sands and literature review confirm the necessity to apply a correlation factor for calcareous material to the raw cone penetration resistance CPT values obtained in the field. Because of the very fragile grains of the Dubai calcareous sands the penetration resistance will be influenced by crushing and grinding. To accommodate for effect of calcareous sands on measured CPT values, a best fit correlations formula called here “correlation factor” is developed. A parametric dynamic triaxial liquefaction testing programme has been executed on representative samples with loose and dense zones. Representative testing parameters for field conditions and earthquake design accelerations have been applied indicating that ground improvement is necessary. It was observed during the dynamic triaxial tests that the whole soil mass consisting of dense columns and looser zones in between behaves jointly, and therefore compaction control using an average-CPT approach is possible.
Geotechnical and Geological Engineering, Jun 1, 2006
With ports and other near shore structures expanding, and regions previously not considered prone... more With ports and other near shore structures expanding, and regions previously not considered prone to earthquakes being re-classified after recent earthquake events, ground improvement by stone columns is increasingly considered to improve loose or soft in situ soils. The Dry Bottom Feed Stone Column construction technique can be used under water if a double-lock stone delivery system is attached to the vibroprobe. The use of pneumatic stone transport from the barge into the vibroprobe receiver tank makes it possible to reach large water and treatment depths. Digital recording of all relevant operation parameters provides a very high level of quality assurance, including a diameter-over-depth profile for each stone column. An introduction to earthquake-resistant design of stone columns and guidelines for specifying Marine Stone Columns are given.
Applied Clay Science, Feb 1, 1995
Several methods have been suggested for the determination of swelling pressure of expansive soils... more Several methods have been suggested for the determination of swelling pressure of expansive soils. The two most commonly used methods are the zero swell test and the swell-consolidation test. This paper introduces two relatively new techniques termed the restrained swell ...
EGS - AGU - EUG Joint Assembly, Apr 1, 2003
Bulletin of the International Association of Engineering Geology, Oct 1, 1995
Engineering Geology, Jun 1, 1995
Journal of Earthquake Engineering, Nov 1, 2004
Journal of Geotechnical and Geoenvironmental Engineering, 1997
Natural Hazards, Jul 1, 1995
Environmental & Engineering Geoscience, Sep 1, 1995
Lagoons were constructed within colluvial deposits in an area of 140,000 m2 as part of Wadi Es-Si... more Lagoons were constructed within colluvial deposits in an area of 140,000 m2 as part of Wadi Es-Sir Sewage Treatment Plant Project in Jordan. The site has been excavated into steps and risers to construct the lagoons. A major noncircular slope failure occurred in October 1993 on the upper slope of the middle lagoon, resulting in an interruption of construction. Field and laboratory investigations were conducted to identify various geomorphologic zones, stratigraphy and geotechnical properties of all materials encountered at the site. Slope stability back analysis of failed slope was carried out using the 2-D limiting equilibrium Simplified Janbu method. Also, stability analysis was carried out for existing and improved conditions for all lagoons. Dry, partially saturated and fully saturated conditions were considered in the analysis. Pseudostatic stability analysis of the slopes was carried out considering a horizontal bedrock Peak Ground Acceleration (PGA) value of 0.2 g, evaluated at the site using a line source probabilistic seismic hazard assessment model incorporated in the computer program FRISK (McGuire, 1978). The study showed that the failure occurred through colluvial material due to the removal of a large amount of such materials near the toe of the slope during construction of the lagoon. The location of the slip surface was between 8 to 12 m in depth. Effective residual shear strength parameters along the failure plane were found to be: angle of friction (ϕ′) = 17°, and cohesion (c′) = 0.05 kg/cm2. Stability conditions for slopes at all lagoon sites were found to be unacceptable. Recommended measures to stabilize the slopes include replacing (partially or fully) the existing colluvial materials with free-drained rockfill to reach acceptable factors of safety under design conditions. These measures were implemented at the site.
Soil Dynamics and Earthquake Engineering, 1995
Natural Hazards, Mar 1, 1995
Engineering Geology, Aug 1, 1997
Environmental & Engineering Geoscience, Jun 1, 1995
Updated seismic hazard maps have been prepared based on a probabilistic approach for Jordan in ge... more Updated seismic hazard maps have been prepared based on a probabilistic approach for Jordan in general and for Karak City specifically using the line source model. A new earthquake catalogue covering the period from 1 a.d. to 1992 a.d. is used, which includes all events that occurred in Jordan and adjacent areas, covering an area between latitudes 27.0°–35.5° and longitude 32.0°–39.0°E. Ten seismic sources were identified in the assessment of the seismic hazard maps. These are the Aqaba Gulf fault, Wadi Araba fault, Dead Sea fault, Northern fault, Southeast Mediterranean fault, Farah and Carmel fault, Wadi Sirhan fault, Karak-Fayha fault, Suez Gulf fault, and Cyprus zone fault. The peak ground acceleration (PGA) is selected as a measure of the ground motion severity. A suitable attenuation equation (Esteva, 1974) reported in the literature is selected for PGA computations. The computations are carried out using the FRISK computer program. The seismic maps corresponding to a 90 percent probability of not being exceeded are presented for a lifetime of structures for 50,100 and 200 years.
International Journal of Environmental Technology and Management, 2005
Journal of Geotechnical and Geoenvironmental Engineering, Aug 1, 1997
Natural Hazards, Jul 1, 2004
Journal of Geotechnical Engineering, Jul 1, 1995
This paper investigates the effect of cyclic wetting and drying on the expansive characteristics ... more This paper investigates the effect of cyclic wetting and drying on the expansive characteristics of clays. For this purpose, six expansive soils were obtained from various locations in Irbid (a city in northern Jordan). After each cycle, the swell potential and swell pressure were ...
Applied Clay Science, Dec 1, 1996
Environmental geology, Apr 16, 1997
Geotechnical and Geological Engineering, Jun 1, 2006
The study is concerned with the influence of various factors on vibro compaction in calcareous so... more The study is concerned with the influence of various factors on vibro compaction in calcareous soils, This include effect of carbonate content, and influence of pore water pressures in sand, settlements during vibrocompaction, vibroaccelerations during sand column installation compared to earthquake accelerations and finally the liquefaction design based on average CPT parameters. Previous experiences with calcareous sands and literature review confirm the necessity to apply a correlation factor for calcareous material to the raw cone penetration resistance CPT values obtained in the field. Because of the very fragile grains of the Dubai calcareous sands the penetration resistance will be influenced by crushing and grinding. To accommodate for effect of calcareous sands on measured CPT values, a best fit correlations formula called here “correlation factor” is developed. A parametric dynamic triaxial liquefaction testing programme has been executed on representative samples with loose and dense zones. Representative testing parameters for field conditions and earthquake design accelerations have been applied indicating that ground improvement is necessary. It was observed during the dynamic triaxial tests that the whole soil mass consisting of dense columns and looser zones in between behaves jointly, and therefore compaction control using an average-CPT approach is possible.
Geotechnical and Geological Engineering, Jun 1, 2006
With ports and other near shore structures expanding, and regions previously not considered prone... more With ports and other near shore structures expanding, and regions previously not considered prone to earthquakes being re-classified after recent earthquake events, ground improvement by stone columns is increasingly considered to improve loose or soft in situ soils. The Dry Bottom Feed Stone Column construction technique can be used under water if a double-lock stone delivery system is attached to the vibroprobe. The use of pneumatic stone transport from the barge into the vibroprobe receiver tank makes it possible to reach large water and treatment depths. Digital recording of all relevant operation parameters provides a very high level of quality assurance, including a diameter-over-depth profile for each stone column. An introduction to earthquake-resistant design of stone columns and guidelines for specifying Marine Stone Columns are given.
Applied Clay Science, Feb 1, 1995
Several methods have been suggested for the determination of swelling pressure of expansive soils... more Several methods have been suggested for the determination of swelling pressure of expansive soils. The two most commonly used methods are the zero swell test and the swell-consolidation test. This paper introduces two relatively new techniques termed the restrained swell ...
EGS - AGU - EUG Joint Assembly, Apr 1, 2003
Bulletin of the International Association of Engineering Geology, Oct 1, 1995
Engineering Geology, Jun 1, 1995
Journal of Earthquake Engineering, Nov 1, 2004
Journal of Geotechnical and Geoenvironmental Engineering, 1997