Determination Of Mse Wall Pseudo Static Coefficient Based On Seismic Performance,
2013
Tarbiat Modares University, Iran
Determination Of Mse Wall Pseudo Static Coefficient Based On Seismic Performance, Ali Komak Panah, Majid Yazdandoust, Reza Sadeghzadegan
International Conference on Case Histories in Geotechnical Engineering
This study, tries to suggest a design method based on displacement using finite difference numerical modeling in reinforcing soil retaining wall. In this case, loading characteristics, such as magnitude, frequency, peak ground acceleration and geometrical characteristics of reinforced soil structure are considered to correct the pseudo static method and finally introduce the pseudo static coefficient as a function of seismic performance level and peak ground acceleration. In addition, the authors has tried to simply suggest the equivalent harmonic loading of selected acceleration records. Considering the loading parameters, mechanically stabilized earth wall parameters and type of the site showed that the …
Effects Of Silt Content On Dynamic Properties Of Solani Sand,
2013
IIT Roorkee, India
Effects Of Silt Content On Dynamic Properties Of Solani Sand, Bablu Kirar, B. K. Maheshwari
International Conference on Case Histories in Geotechnical Engineering
In the present article, the results of cyclic triaxial tests conducted on Solani sand, collected from the bed of Solani River near Roorkee, are presented. Results of strain controlled undrained tests carried out as per ASTM D3999 for determinations of dynamic soil properties are presented. The variations of shear modulus with shear strain are reported. Remoulded samples were prepared with different percentage of silt contents and tested. The effects of silt content on shear modulus of Solani sand at different shear strain are evaluated. This effect is studied at two relative densities. It was found that the effect of silt …
An Investigation On The Stack Vibrations And Geotechnical Rehabilitation Solutions Case-Study: Khangiran Gas Refinery,
2013
Khangiran Gas Refinery, Iran
An Investigation On The Stack Vibrations And Geotechnical Rehabilitation Solutions Case-Study: Khangiran Gas Refinery, Hadi Ghodrat, Abolfazl Yazdinejad, Javad Hosseini Masum, Mehdi Barjini Khabbaz, Arsalan Ghahramani
International Conference on Case Histories in Geotechnical Engineering
The 75 (m) high stacks of the sulfur recovery units of Khangiran Gas Refinery in Iran exhibited significant levels of vibration in winds. Field observations reported that vibration occurred in the stacks 9 times during reel years. The longest vibration duration is 8 hours and maximum tip deflection is 1 (m). In most intensive vibration occurrence much amount of water exits from around of foundation and some crack is created in the structure. Stack diameter is 4.57 (m) at the bottom and 3.43 (m) at the top and its total weight is 182.3 (Ton). The octagonal foundation diameter is 14 …
Performance Of Lightweight Structures During Liquefaction From Recent Earthquakes,
2013
Kleinfelder Inc., San Diego, CA
Performance Of Lightweight Structures During Liquefaction From Recent Earthquakes, Jorge F. Meneses, Yun Liao
International Conference on Case Histories in Geotechnical Engineering
Several case histories of lightweight structures performance during liquefaction from recent earthquake are reviewed. The review is focused on performance of lightweight structures in terms of liquefaction-induced vertical settlement, tilting, lateral displacement and their effects on occupancy and functionality of the structures. These case histories were reported during the 1997 Mw 7.4 Caucete- Argentina, 2007 Mw 8.0 Pisco-Peru, 2010 Mw 8.8 Chile, 2010 Mw 7.2 El Mayor-Cucapah, 2010-2011 New Zealand, and 2011 Mw 9.0 Great East Japan earthquakes. The review is performed to identify similarities, discuss conditions, and their effects on foundation and structures. Financial …
Spectral Attenuation Characteristics Of Strong Ground Motions In East-Central Iran Using Theoretical Data,
2013
Islamic Azad University, Iran
Spectral Attenuation Characteristics Of Strong Ground Motions In East-Central Iran Using Theoretical Data, Majid Mahood, Hossein Hamzehloo
International Conference on Case Histories in Geotechnical Engineering
Ground-motion prediction equations are an essential element of PSHA. In seismic hazard analysis, attenuation calculations determine how quickly ground motions decrease as the distance from a seismic event increases. The estimation of ground motion for future earthquakes as a function of magnitude and distance is an important problem from earthquake engineering point of view. This article presents spectral equations for the estimation of horizontal strong ground motions caused by shallow crustal earthquakes with magnitude range of Mw 5.0 to 7.4 and distance to the surface projection of the fault less than 100 km for theoretical (simulated) records. The reason …
Variation Of Intrinsic And Scattering Attenuation Of Seismic Waves With Depth In The Bam Region, East-Central Iran,
2013
Islamic Azad University, Iran
Variation Of Intrinsic And Scattering Attenuation Of Seismic Waves With Depth In The Bam Region, East-Central Iran, Majid Mahood
International Conference on Case Histories in Geotechnical Engineering
The attenuation properties of the lithosphere in the Bam region, East-Central Iran, have been investigated. For this purpose, 42 local earthquakes (aftershocks of Bam earthquake, Mw 6.5, 2003) having focal depths less than 25 km have been used. The quality factor of coda waves (Qc) has been estimated using the single backscattering model. The quality factors Qp, Qd (P and direct S-waves) have been estimated using the extended-coda normalization method. Qi and Qs (the intrinsic and scattering attenuation parameters) have been estimated for the region. The values of Qp, Q …
Modified Value Of Rock Quality Designation Index Rqd In Rock Formation,
2013
Housing and Building National Research Center (HBRC), Egypt
Modified Value Of Rock Quality Designation Index Rqd In Rock Formation, Ahmed T. M. Farid
International Conference on Case Histories in Geotechnical Engineering
The rock quality designation, RQD, is a commonly index used in the description of rock mass quality. This RQD, index value is used to predict the engineering properties of the rock strata under study. The RQD index value was introduced for the engineering applications, such as mining and geotechnical engineering. Calculating of RQD index for rock formation is a great part due to its simplicity. However, this also leads to a number of limitations, including among other, a dependency of RQDm value on the borehole orientation and on the selected threshold value for the minimum intact core length. In this …
Amirkabir Natm Tunnel — A Case Study Of Design Challenges In A Mega Project Of Tunnel In Soft Ground,
2013
Tarbiat Modares University, Iran
Amirkabir Natm Tunnel — A Case Study Of Design Challenges In A Mega Project Of Tunnel In Soft Ground, Aliakbar Golshani, Ehsan Moradabadi
International Conference on Case Histories in Geotechnical Engineering
In spite of enhancement in modeling techniques as well as site investigation methods, uncertainty exists seriously in the process of construction of underground structure in soft soils. These uncertainties arise from limited data of geological data, measurement errors, interpolation of spatially geological properties, and extrapolation of results of experiments and natural analogue studies over times and conditions relevant to the project. Robust and optimize design of tunnel support pattern consists of many important parameters including advance rate and excavation method. However, quantitative definition of these parameters is difficult because of restricting in site investigation data and uncertainties related to them. …
Support System Design Of Power House And Transformer Caverns In Dikchu Hydropower Project, Sikkim,
2013
IIIT Hyderabad, India
Support System Design Of Power House And Transformer Caverns In Dikchu Hydropower Project, Sikkim, Neelima Satyam
International Conference on Case Histories in Geotechnical Engineering
The Dikchu hydropower project is 3 x 32 MW hydro power plant across river Dikchu in Sikkim, India. Dikchu is a tributary of River Teesta, a major river flowing right across Sikkim. The proposed hydro power project site is about 10 km upstream of the confluence of River Dikchu with River Teesta. Two more hydro power projects of NHPC, namely, Teesta Hydro Power Project Stage-IV and Teesta Hydro Power Project Stage-V on the River Teesta, are being commissioned upstream and downstream of the above mentioned confluence. Surface geological mapping indicated that quartzitic phyllite with bands of phyllites shear zones are …
Numerical Analysis To Examine The Effect Of Landslides On Tunnels,
2013
Nippon Koei Co., LTD. Research and Development Center, Japan
Numerical Analysis To Examine The Effect Of Landslides On Tunnels, Keiichi Ota, Senro Kuraoka, Toshiya Takeshi
International Conference on Case Histories in Geotechnical Engineering
In the vicinity of known landslide zones, tunnel routes should be designed such that the distance between the landslide and the tunnel is sufficient to avoid adverse impact of the landslide on the tunnel. This requires a good understanding of the effects of the landslide on the tunnel. We modeled the ground surrounding the tunnel and the landslide using numerical analysis to evaluate the quantitative effect of the tunnel offset from the landslide on ground stresses and displacement of the ground surface and tunnel crown. We considered the effects under different ground conditions and examined two different cases, when the …
Ellis Island: Vibration Effects On Historic Buildings Caused By Pile Driving,
2013
Schnabel Engineering, West Chester, PA
Ellis Island: Vibration Effects On Historic Buildings Caused By Pile Driving, Sixto Fernandez
International Conference on Case Histories in Geotechnical Engineering
The seawalls that surround Ellis Island were constructed in the early 1900s and now show varying degrees of deterioration. The approach to the structural repair of the seawalls consisted of installing H-piles and ground anchors for stabilization of vertical and horizontal seawall movements. The H-piles were driven through the retained soils along the seawalls to top of rock. This paper presents ground vibration data collected simultaneously by four seismographs during driving of 40 piles (up to 100 ft depth) at various distances from the historical buildings. A correlation between the recorded PPV values and the distance to pile driving is …
Geotechnical Opportunities On A Fast-Track Bridge Project,
2013
Soil and Materials Engineers, Inc., Plymouth, MI
Geotechnical Opportunities On A Fast-Track Bridge Project, Joel W. Rinkel, Christopher G. Naida
International Conference on Case Histories in Geotechnical Engineering
The bridge for Nine Mile Road over Interstate 75 in Hazel Park, Michigan was destroyed by a tanker fire. The loss of the bridge was considered an emergency situation. Therefore, the bridge replacement was put on a fast-track schedule. Geotechnical engineering challenges included the design of shallow and deep foundations, design of light-weight backfill behind abutments, design of temporary earth retention systems to minimize traffic disruption during construction, and coordinating design changes during construction based on variable subsurface conditions. The design was based on the Bridge Design Specifications from the American Association of State Highway and Transportation Officials (AASHTO) Load …
Geotechnical Forensic Investigation Of Observed Cracks On A Building In Tallahassee, Florida,
2013
Geosyntec Consultants, Jacksonville, FL
Geotechnical Forensic Investigation Of Observed Cracks On A Building In Tallahassee, Florida, Rutuparna Joshi, Kwasi Badu-Tweneboah, David Riotte, Rachel Klinger, Aaron Cohen
International Conference on Case Histories in Geotechnical Engineering
In July 2010, two vapor extraction wells were installed about 15 feet from a building at an angle of 50 degrees to the horizontal using rotosonic drilling technique (RDT). In June 2011, a crack approximately 0.5 inch wide on the wall of the building was reported. Several other small cracks were observed on the building following inspection by the authors. The owner of the building expressed concerns that the rotosonic drilling was the cause of the cracks and wanted assurance that subsequent drillings would not exacerbate the problem. Geotechnical forensic investigation was performed to evaluate the potential cause(s) of cracking …
Behaviour Of Laterally Loaded Piles,
2013
Istanbul Technical University, Turkey
Behaviour Of Laterally Loaded Piles, Berrak Teymur, Zeynep Şekerer
International Conference on Case Histories in Geotechnical Engineering
Pile foundations are often subject to lateral loads and axial loads. Although design methods for axial loading are well developed, lateral loading cases have attracted more attention recently following reported case histories of piles damaged during earthquakes. In this work, pile design due to lateral loading in tuff soils is considered. Pile deflections, bending moment and rotation were analyzed with OpenSeesPL program, a 3D finite element tool. OpenSeesPL is used to model the properties of the piles which are embedded in tuff and laterally load tested in Izmir. The displacement calculated by OpenSeesPL of 2.25mm is close to the measured …
Pressuremeter Testing In Stiff To Hard Cohesive Soils,
2013
Ground Engineering Consultants, Inc., Northbrook, IL
Pressuremeter Testing In Stiff To Hard Cohesive Soils, Robert G. Lukas
International Conference on Case Histories in Geotechnical Engineering
The pressuremeter which was introduced into the U.S. in about 1970 provides the geotechnical engineer with a new tool for measuring soil properties. It is conducted in-situ thereby minimizing sample disturbance. It also tests the soil under the prevailing stress conditions in the soil mass. Measurements of the failure pressure and modulus of the soil are used to predict bearing capacity and settlement. This paper discusses a few commercial projects plus sites where load tests were performed and settlement measurements were obtained for comparison to predictions based upon pressuremeter parameters.
120 Years Of Caisson Foundations In Chicago,
2013
Case Foundation Company, Roselle, IL
120 Years Of Caisson Foundations In Chicago, Robert E. Schock, Eric J. Risberg
International Conference on Case Histories in Geotechnical Engineering
Chicago can be called the birthplace of the Skyscraper, and also tlle Drilled Shaft Foundation, both of which came into being late in the 19th century. The story of the Chicago Caisson begins with the presence of a thick deposit of soft clay beneath the City, and continues with the succession of building booms that have characterized the growth of the City over the last 140 years, beginning just after the Great Fire of 187 1. During that first boom, new tall structures were built so rapidly, and amid such profound geotechnical uncertainty, that the process of designing a successful …
Liquefaction-Induced Damage In The2010-2011 Christchurch (New Zealand) Earthquakes,
2013
University of Canterbury, New Zealand
Liquefaction-Induced Damage In The2010-2011 Christchurch (New Zealand) Earthquakes, Misko Cubrinovski
International Conference on Case Histories in Geotechnical Engineering
A series of strong local earthquakes hit the city of Christchurch (New Zealand) in the period between September 2010 and December 2011. The earthquakes produced strong ground motions, and were very damaging. The magnitude 6.2 22 February 2011 earthquake was particularly devastating causing heavy damage to the city and 185 fatalities. The earthquake caused widespread and severe liquefaction over approximately one third of the city area which arguably was the most severe and extensive liquefaction in native soils on record. This paper presents an overview of the liquefaction-induced damage to the land, buildings and infrastructure caused by the 2010-2011 earthquakes.
Geotechnical Problems In The 2011 Tohoku Pacific Earthquakes,
2013
Tokyo Institute of Technology, Japan
Geotechnical Problems In The 2011 Tohoku Pacific Earthquakes, Kohji Tokimatsu, Hiroko Suzuki, Kota Katsumata, Shuji Tamura
International Conference on Case Histories in Geotechnical Engineering
An overview of the geotechnical aspects of the building damage in the 2011 Tohoku Pacific earthquake is presented, based on field reconnaissance made after the quake. It is shown that: (1) Extensive soil liquefaction occurred along the coast of Tokyo Bay and around the Tonegawa River floodplain. Liquefaction primarily occurred within relatively new reclaimed area, with large ground settlement up to 60 cm, accompanied by settlement/tilting of wooden and reinforced concrete buildings supported on spread foundations; (2) Numerous houses in Sendai’s hilly residential areas constructed with cut-and-fill methods were badly damaged not only by simple collapse of retaining walls, but …
Earthquake Geotechnical Engineering Aspects Of The 2012 Emilia-Romagna Earthquake (Italy),
2013
University of Ferrara, Italy
Earthquake Geotechnical Engineering Aspects Of The 2012 Emilia-Romagna Earthquake (Italy), Vincenzo Fioravante, Daniela Giretti, Glenda Abate, Stefano Aversa, Daniela Boldini, Piera Paola Capilleri, Antonio Cavallaro, Deepak Chamlagain, Teresa Crespellani, Francesca Dezi, Johann Facciorusso, Alessandro Ghinelli, Salvatore Grasso, Giuseppe Lanzo, Claudia Madiai, Maria Rosella Maugeri, Michele Maugeri, Alessandro Pagliaroli, Carlo Rainieri, Giuseppe Tropeano, Filippo Santucci De Magistris, Stefania Sica, Francesco Silvestri, Giovanni Vannucchi
International Conference on Case Histories in Geotechnical Engineering
On May 20, 2012 an earthquake of magnitude ML=5.9 struck the Emilia Romagna Region of Italy and a little portion of Lombardia Region. Successive earthquakes occurred on May 29, 2012 with ML=5.8 and ML=5.3. The earthquakes caused 27 deaths, of which 13 on industrial buildings. The damage was considerable. 12,000 buildings were severely damaged; big damages occurred also to monuments and cultural heritage of Italy, causing the collapse of 147 campaniles. The damage is estimated in about 5-6 billions of euro. To the damage caused to people and buildings, must be summed the indirect damage due to loss of industrial …
Barrette Foundations — Two Case Histories From Turkey,
2013
Bogaziçi University, Istanbul, Turkey
Barrette Foundations — Two Case Histories From Turkey, H. Turan Durgunoglu
International Conference on Case Histories in Geotechnical Engineering
In the recent decades construction of tower structures in big cities around the world is a new trend that has been followed. As a result, engineers are faced with foundations to be designed and constructed under heavier super structural loads imposed by such structures. Often, poor subsoil conditions, site heterogeneity, variability in geometry, and high seismicity brings further challenge in cost effective and safe foundation design. To overcome such complexities and meet higher load capacity requirements often barrette foundations have been utilized instead of cast in situ circular large diameter piles. In this paper applications of barrette foundations together with …
