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Articles 10531 - 10560 of 21775
Full-Text Articles in Engineering
The Importance Of Field Tests And Monitoring Activity For The Remedial Measurements Coresponding To Some Old Buildings In Bucharest, Anton Chirica
The Importance Of Field Tests And Monitoring Activity For The Remedial Measurements Coresponding To Some Old Buildings In Bucharest, Anton Chirica
International Conference on Case Histories in Geotechnical Engineering
The present paper shows the way in which by field tests such as light and standard dynamic penetrations, the effects of a deep excavation on the nearby constructions could be quantified. The consolidation works could be design taking into account the interpretation of the test results
Underpinning For A Distressed Building In Northest Thailand, Suksun Horpibulsuk, Apichit Kumpala, Wanchai Katkan, Runglawan Rachan
Underpinning For A Distressed Building In Northest Thailand, Suksun Horpibulsuk, Apichit Kumpala, Wanchai Katkan, Runglawan Rachan
International Conference on Case Histories in Geotechnical Engineering
This paper presents a case history on the failure of Suranivet 9, a student dormitory in the campus of Suranaree University of Technology (SUT), Thailand. The dormitory encountered excessive differential settlement due to the variation in soil profile. Underpinning to extend the foundations down to stable stratum was employed to strengthen bearing capacity and minimize settlement. The underpinning design and procedure were summarized. In practice, the static formula was used for the preliminary micro-pile design (selection of pile section and length for different loads and soil profiles). The undrained shear strength (Su) of SUT silty clay was approximated using standard …
Case History And Numerical Analysis Of Trench Collapse In Japan, Sahaphol Timpong, Kazuya Itoh, Yasuo Toyosawa
Case History And Numerical Analysis Of Trench Collapse In Japan, Sahaphol Timpong, Kazuya Itoh, Yasuo Toyosawa
International Conference on Case Histories in Geotechnical Engineering
This paper presents a case history of trench collapse occurred during trench excavation in soft ground. The development of settlement and horizontal displacement, the generation of pore water pressure during the construction and mechanism of trench collapse are investigated by means of centrifuge modeling and numerical analysis. It is found that the combination of centrifuge modeling and in-flight sand hopper can provide dramatic result for simulation of the trench collapse. Based on the results, it is verified that the occurrence of trench collapse is mainly caused by the excessive surcharge load of excavated material stockpiled on top of the trench.
Repair Of A Failed Slope Using Geogrid Reinforcement, Pichit Jamnongpipatkul, Punya Chupanit
Repair Of A Failed Slope Using Geogrid Reinforcement, Pichit Jamnongpipatkul, Punya Chupanit
International Conference on Case Histories in Geotechnical Engineering
Slope failures often occur in highways located in the mountainous terrain of Northern Thailand. There are several factors which induce those failures. The construction material consists of cohesionless decomposed granite. The highway embankment is steep over 30 m in height. The rainfall is very high during the monsoon season. Due to limitation of right of way, difficulty in the reconstruction and environmental consideration, geogrid reinforced embankment is introduced. The advantages of using the reinforced structure are to use less material because the very steep slope can be maintained and the vegetative cover is feasible. However, the method is expensive, economical …
Seismic Source And Its Effect On Site Response Observed In Chilean Subductive Environment, Ramón Verdugo, César Pastén
Seismic Source And Its Effect On Site Response Observed In Chilean Subductive Environment, Ramón Verdugo, César Pastén
International Conference on Case Histories in Geotechnical Engineering
Among other factors that influence the seismic motion resulting at the ground surface are the characteristics of the seismic source. This factor has been recognized that would affect the frequency content of the resulting motion. In this context, Chilean subductive environment provides a considerable variety of seismogenic sources allowing the study of this factor. The analysis of spectrograms of recorded earthquakes originated by different seismogenic sources at different site conditions is presented. The results indicate that in the case of shallow thrust earthquakes a predominant frequency can be observed, which agrees with the predominant frequency obtained by the H/V spectral …
Analysis Of Two Case Histories Of Violent Landslides Triggered By Earthquakes, N. Gerolymos
Analysis Of Two Case Histories Of Violent Landslides Triggered By Earthquakes, N. Gerolymos
International Conference on Case Histories in Geotechnical Engineering
Two earthquake–triggered violent landslides are studied. The Nikawa, activated by the Mw 7 1995 Kobe Earthquake, and the Higashi–Takezawa, activated by the MJMA 6.8 2004 Niigata-ken Chuetsu earthquake, in Japan. Both landslides involved about 100 m displace-ment of a large wedge of an originally rather mild slope. The surprisingly large and rapid in nature runoff of the soil masses, motivated several researchers to interpret the sliding process. There is still no consensus as to which were the actual causes of those two catastrophic events. The goal of the paper is to study: (i) the landslide triggering and propagation, and (ii) …
Spouse Program, Sally Prakash
Spouse Program, Sally Prakash
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Exhibitors, Multiple Members
Exhibitors, Multiple Members
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Tension And Compression Micropile Load Tests In Gravelly Sand, Armin W. Stuedlein, Matt D. Gibson, Garry E. Horvitz
Tension And Compression Micropile Load Tests In Gravelly Sand, Armin W. Stuedlein, Matt D. Gibson, Garry E. Horvitz
International Conference on Case Histories in Geotechnical Engineering
Micropiles were selected for several upgrades to a paper machine at the Nippon Paper Industries USA Company in Port Angeles, Washington. This paper presents several aspects of the micropile design and subsequent load test performance for two separate upgrades at the paper mill. The micropile load tests, performed in tension and compression, provide a reference for micropile performance in medium dense to dense, gravelly sand. Comparison of the load test performance suggests that the common assumption of neglecting the contribution of end-bearing resistance does not adequately model micropile behavior. Additionally, evidence is presented for load transfer through the micropile casing. …
Calibration Of Computer Program Sassi For Vibration Transmissibility Analysis In Underground Structures Using Field Measured Data, Frederick Tajirian, Mansour Tabatabaie, Fred Asiri, Andrei Seryi
Calibration Of Computer Program Sassi For Vibration Transmissibility Analysis In Underground Structures Using Field Measured Data, Frederick Tajirian, Mansour Tabatabaie, Fred Asiri, Andrei Seryi
International Conference on Case Histories in Geotechnical Engineering
The successful operation of facilities that incorporate long electron-positron beams necessitates a very low vibration environment at the beam supports. Mitigation of the ground motion and imported vibration from the numerous vibrations sources is the main engineering challenge for these projects. Computer program SASSI was selected as an analysis tool for calculating the vibrations in underground tunnels resulting from near field sources due to equipment operation as well as far-field sources for a new generation of linear colliders. The program capabilities were validated by comparing calculated vibration results with field obtained measurements performed at the Los Angeles County Metropolitan Authority …
Groundwater Lowering In Deep Excavation (Case Study: Foundation Excavation Of Shahid Madani Dam), A. H. Sadeghpour, A. Ghanbari, M. Fadaee
Groundwater Lowering In Deep Excavation (Case Study: Foundation Excavation Of Shahid Madani Dam), A. H. Sadeghpour, A. Ghanbari, M. Fadaee
International Conference on Case Histories in Geotechnical Engineering
In many big civil constructions, deep excavation is an essential part of project and groundwater control in excavation process is the prominent tasks. In this paper while mentioning the risks of deep excavation, the solutions of underground water control have been explained and different methods of groundwater control in regard to financial conditions, different soil condition and various depths have been investigated. Groundwater control in foundation excavation of Shahid Madani Dam as a case study is presented. Depth of foundation excavation was about 50 meters in tight valley and excavation was performed under groundwater table. This excavation is one of …
Characterization Of The Shear-Induced Potential (Sip) In Clay And The Application To Landslide Sites, Koichi Nakagawa, Shigenobu Yamada, Isamu Tsuka
Characterization Of The Shear-Induced Potential (Sip) In Clay And The Application To Landslide Sites, Koichi Nakagawa, Shigenobu Yamada, Isamu Tsuka
International Conference on Case Histories in Geotechnical Engineering
Electrical polarizations were observed in common fine soil aggregates in shear deformation tests and simulations conducted in a laboratory. This electric potential is called Shear-induced Potential (SIP). The SIP can be interpreted as the physicochemical interaction between the surface of clay particles and interstitial water by the kinetics of the electric double layer. The SIP could not be detected in a remolded craft clay sample, which was possibly treated with electrically non-dipole oil. In the laboratory, a plane strain test under the un-drained condition was carried out to reveal the characteristics of the polarization accompanying the shear deformation. Gouges from …
A Field Test Study On Under Water Vacuum Preloading Method, A. K. L. Kwong, X. F. Han, L. G. Tham, P. K. K. Lee, W. B. Zhao
A Field Test Study On Under Water Vacuum Preloading Method, A. K. L. Kwong, X. F. Han, L. G. Tham, P. K. K. Lee, W. B. Zhao
International Conference on Case Histories in Geotechnical Engineering
Vacuum preloading technique incorporating prefabricated vertical drains is one of the most widely used ground improvement methods in the world for improving the engineering properties of soft clays. Although many successful on-shore cases on application of the technique have been reported, the effectiveness of applying the technique under water has not yet been investigated. Moreover, many technical and operation factors, that are playing important roles in vacuum consolidation, are also not yet fully understood. To study the feasibility of under water vacuum preloading, a large-scale field test was conducted. A 50 m by 50 m geo-membrane was laid under water …
Construction Of Mass Concrete Structure Utilizing Ground Settlement From Underpass Construction In The 2nd Phase Kansai International Airport Project, Masaru Fujimoto, Takechiho Tabata, Tsuyoshi Emura, Masato Nakamichi
Construction Of Mass Concrete Structure Utilizing Ground Settlement From Underpass Construction In The 2nd Phase Kansai International Airport Project, Masaru Fujimoto, Takechiho Tabata, Tsuyoshi Emura, Masato Nakamichi
International Conference on Case Histories in Geotechnical Engineering
The man-made island of Kansai International Airport is located 5 km offshore in Osaka bay and the water depth at the point is about 20 m. Thickness of the sediments beneath the island is several hundred meters, including 20 m of very soft Holocene clay layer. Huge amount of soil had been reclaimed layer over layer and the total thickness is up to 34 to 45 m. Therefore, large amount of settlement is inevitable and the average settlement forecast in the 2nd phase island over the 60 years period from the start of reclamation work is 18 m. In this …
Use Of Case Histories In The Classroom, Carsten H. Floess
Use Of Case Histories In The Classroom, Carsten H. Floess
International Conference on Case Histories in Geotechnical Engineering
Use of case histories provides an important role in Civil Engineering education, presenting an opportunity for students to extend the principles found in textbooks to real world, practical problems. Case histories provide students with a sense of judgment and a sampling of the “art” in geotechnics. The author, an Adjunct Professor of Civil Engineering at Rensselaer Polytechnic Institute, has used contemporary case history examples related to foundation and geotechnical engineering to supplement and invigorate classroom instruction and prepare students for the workforce. Typical examples related to foundation engineering include: • Design of subsurface investigation programs for structures, wastewater treatment plants, …
Enhancement Of Bearing Capacity By Dynamic Compaction: A Case History, Liaqat Ali, Sarfraz Ali
Enhancement Of Bearing Capacity By Dynamic Compaction: A Case History, Liaqat Ali, Sarfraz Ali
International Conference on Case Histories in Geotechnical Engineering
Deep Dynamic Compaction technique was used to improve soil bearing capacity in one of the project in Pakistan. It was first project in the country where Deep Dynamic Compaction technique was used for soil improvement. The soil at construction site composed of alluvial deposits. The sub-surface profile with in the depth of influence of proposed structure comprised of different layers of varying thickness within the construction site. The top 1-2 meter strata was an imported fill compacted in layers and composed of sandy silty clayey soil with percentage of fines as high as 75 percent The water table was located …
Dynamic Geotechnical Characterization Of San Giuliano Di Puglia Seismic Area, Antonio Cavallaro, Salvatore Grasso, Michele Maugeri
Dynamic Geotechnical Characterization Of San Giuliano Di Puglia Seismic Area, Antonio Cavallaro, Salvatore Grasso, Michele Maugeri
International Conference on Case Histories in Geotechnical Engineering
The city of San Giuliano di Puglia (CB), located in the Molise region in Southern Italy, is prone to high seismic risk. For site characterisation of soil deep site investigations have been undertaken. Borings, static and dynamic in situ tests have been performed. Among them Cone Penetration Tests (CPT), Cross-Hole (C-H) Down-Hole (D-H) and Seismic Dilatometer Marchetti Tests (SDMT) have been carried out, with the aim to evaluate the soil profile of shear waves velocity (Vs). Moreover the following laboratory tests were carried out on undisturbed samples: Oedometer tests, undrained Triaxial tests and Resonant Column tests. The available …
Evolution Of Soil Desaturation By Air-Injection Technique And Its Evaluation Via Multiphase Flow Simulation, Hide Yasuhara, Takamasa Morito, Yoshinori Kochi, Mitsu Okamura
Evolution Of Soil Desaturation By Air-Injection Technique And Its Evaluation Via Multiphase Flow Simulation, Hide Yasuhara, Takamasa Morito, Yoshinori Kochi, Mitsu Okamura
International Conference on Case Histories in Geotechnical Engineering
In this study the simplified model tests that simulate air injection into saturated soils using air-injection probes, are conducted using the two different sizes of soil containers. The experiments using the small container are aimed to examine the rates and magnitudes of the soil desaturation driven by air injection, whilst those with the large container are performed to obtain not only the rates and magnitudes but also the distributions of the desaturated zones within the soil, and to examine influences on the desaturation process exerted by anisotropy of the soil in terms of flow transport. Obtained results indicate that the …
Field Investigation On The Performance Of Rammed Aggregate Pier In A Soft Ground Of Bangladesh, M. J. Hossain, M. Alamgir, M. A. Mahamud
Field Investigation On The Performance Of Rammed Aggregate Pier In A Soft Ground Of Bangladesh, M. J. Hossain, M. Alamgir, M. A. Mahamud
International Conference on Case Histories in Geotechnical Engineering
This paper is concerned with the performance of Rammed Aggregate Pier in soft ground at a selected site of South-West region of Bangladesh. The ground at the site consists of soft fine-grained soil up to great depth with a layer of organic soils at 4.5 to 9m depth from the existing ground surface. The Rammed Aggregate Piers (RAPs) were installed with locally fabricated equipments. Rammed Aggregate Pier of cylindrical shape having 0.75m diameter and 3.4m length were installed manually in three arrangements as single, double and group. A uniform mixture of local sand and brick aggregates at the proportion of …
Foundation Work Of High Tv Tower In Collapsible Loess, Dimcho Evstatiev, Yordan Evlogiev, Mariana Nedelcheva
Foundation Work Of High Tv Tower In Collapsible Loess, Dimcho Evstatiev, Yordan Evlogiev, Mariana Nedelcheva
International Conference on Case Histories in Geotechnical Engineering
The TV tower in Rousse city is the highest in the Balkan area with its 198 m height. It is built up on loess with thickness of the collapsible zone about 15-16 m. The collapsibility has been overcome by excavation deepening up to 14.50 m, dynamic compaction of the excavation bottom with 7.0 tons tamper and building of a 4.5 m soil-cement cushion. A comparison between the calculated and measured settlement and of the soil base moisture content before and after TV tower construction is presented. Geodetic measurements have been made during and after the tower construction. Several calculation methods …
Excavation For Underground Parking In Seville (Spain). Treatment With Reinforced Injections., Fernando De Casa Martín, F. Celis D’Amico, E. Echeverría Valiente, P. Chías Navarro, A. García Bodega
Excavation For Underground Parking In Seville (Spain). Treatment With Reinforced Injections., Fernando De Casa Martín, F. Celis D’Amico, E. Echeverría Valiente, P. Chías Navarro, A. García Bodega
International Conference on Case Histories in Geotechnical Engineering
For the accomplishment of a excavation of several levels, it is necessary the containment decision-making of the ground, and more in work situations under the phreatic level. The possible existing techniques in the market, they are various, each one of they with different applications. One of them is the technique of the treatment of the soil through the Technique of the reinforced injections. With this technique it is considered to accomplish a treatment of the perimeter of the zone to dig, in such a way that modifying the geotechnical characteristics of the soil, they could be obtained the required and …
Ground Improvement Of A Beach Structure Complex By Means Of Stone Columns – A Saudi Arabian Case History, Syed Faiz Ahmad
Ground Improvement Of A Beach Structure Complex By Means Of Stone Columns – A Saudi Arabian Case History, Syed Faiz Ahmad
International Conference on Case Histories in Geotechnical Engineering
Saudi Arabian is a vast peninsula with varying surface and sub-surface geology. There are many regions, especially near the eastern and western coasts, where the sub-surface soil is very poor. In these regions ground improvement is inevitable. The case in point is a Beach Structure Complex built along the famous Half Moon Bay Beach of Al-Khobar in the eastern coast of the Kingdom. The geotechnical investigations revealed poor soil condition and suggested use of Stone Columns for improving the ground condition. A total of 3119 Stone Columns were installed under five important buildings by means of Vibro-Replacement Techniques. The performance …
Improvement Of Thermal Resistivity Of Desert Sand For Use In High Voltage Cable Beddings And Foundation In Arid Zones, Muawia A. Dafalla
Improvement Of Thermal Resistivity Of Desert Sand For Use In High Voltage Cable Beddings And Foundation In Arid Zones, Muawia A. Dafalla
International Conference on Case Histories in Geotechnical Engineering
The soil thermal resistivity is of a great importance for the design of high voltage cables. Underground cables generate heat as a result of power losses when transmitting current. This heat must be dissipated in a form that will not affect the performance of the cables. The presence of moisture normally helps to reduce the thermal resistivity and keeps it within the design range. In arid areas the moisture content is decreased to very low values in dry seasons. This is found to bring the thermal resistively beyond the design ranges. Major cable failures took place during summer times in …
Jet Grouting For Mass Treatment To Support An Aggregate Stockpile Building Over Very Soft Clays, Ken Ivanetich, Lisheng Shao
Jet Grouting For Mass Treatment To Support An Aggregate Stockpile Building Over Very Soft Clays, Ken Ivanetich, Lisheng Shao
International Conference on Case Histories in Geotechnical Engineering
A gravel storage building and distribution facility was planned for construction at the West Parr yard located in the Port of Richmond, California. The general subsurface profile consists of a fill layer overlying a lens of young bay mud, a soft to med stiff silty clay and clayey silt. Below that lied a deeper dense clayey sand and stiff clay layer. The ground water table elevation observed in borings was approximately 7 to 10 feet below the current ground surface. Loads in excess of 3,500 psf would be applied to these strata and relatively tight settlements tolerances were necessitated to …
Performance Study On Geosynthetic Reinforced Shallow Foundations, Sao-Jeng Chao
Performance Study On Geosynthetic Reinforced Shallow Foundations, Sao-Jeng Chao
International Conference on Case Histories in Geotechnical Engineering
The inadequate bearing capacity and the excessive settlement problems of shallow foundations due to the weak soil conditions can be solved by employing the technique of reinforcing to strengthen the properties of the weak soil, which has become a cost-effective solution for civil engineering. This paper follows the processes of experimental work, site performance evaluation, and FEM numerical simulation to study the bearing capacities of the shallow foundations built on reinforced soils in the Ilan area, Taiwan. The purpose of this paper is to propose a relatively simple and economical technique to overcome the weak soil conditions. The eventual goal …
Polyurethane Resin (Pur) Injection For Rock Mass And Structure Stabilization, Matthew J. Demarco
Polyurethane Resin (Pur) Injection For Rock Mass And Structure Stabilization, Matthew J. Demarco
International Conference on Case Histories in Geotechnical Engineering
The Federal Lands Highway Division (FLH), FHWA, is currently investigating the application of polyurethane resin (PUR) injection as a rapidly deployed, cost-effective ground stabilization measure providing superior stabilization performance, while achieving aesthetics objectives . Most recently, in cooperation with the Colorado Department of Transportation (CDOT), FLH completed full-scale PUR demonstration projects at a historic tunnel located along SH 14 in the scenic Poudre Canyon west of Ft. Collins, CO, and at a dry-laid stone masonry wall supporting SH 149 along the Rio Grande River west of South Fork, CO. The Poudre Canyon demonstration involved the “gluing” of a previously bolted …
Review Of In Situ Measurements As Indications Of Liquefaction Potential At Numerous Sites, David Rees Gillette
Review Of In Situ Measurements As Indications Of Liquefaction Potential At Numerous Sites, David Rees Gillette
International Conference on Case Histories in Geotechnical Engineering
Current practice for assessing liquefaction potential of granular soils depends heavily on in situ indices of density, and sometimes direct measurements of density. Correlations have been developed to predict resistance to liquefaction as a function of standard penetration test (SPT) blow count, cone penetrometer (CPT) tip resistance, shear-wave velocity (VS), or other index property. Recognizing that each correlation entails its own uncertainties, and that different indices of liquefaction potential may provide conflicting conclusions, the Bureau of Reclamation reviewed in situ test results from a large number of sites where multiple tests had been used. The goals were to …
Soft Ground Improved By Rigid Vertical Piles. Experimental And Numerical Study Of Two Real Cases In France, M. Nuñez, D. Dias, R. Kastner, C. Poilpré
Soft Ground Improved By Rigid Vertical Piles. Experimental And Numerical Study Of Two Real Cases In France, M. Nuñez, D. Dias, R. Kastner, C. Poilpré
International Conference on Case Histories in Geotechnical Engineering
Settlements remain the major concern during the construction and along the life of a roadway embankment built over soft soils. A foundation ground reinforced by a system of rigid piles is an effective solution; it reduces and homogenizes the surface settlements. Rigid piles reinforcement system has been strongly developed in France for the last fifteen years, however, confrontations of several design used methods highlighted important variations in results. This results in implementing a French National Research Project A.S.I.RI. (Grounds Improvement by Rigid Inclusions) gathering construction companies, engineering and design departments, universities and research centers. This project aims to propose guidelines …
Soil Improvement By Means Of Electro-Osmosis, Sven Hansbo
Soil Improvement By Means Of Electro-Osmosis, Sven Hansbo
International Conference on Case Histories in Geotechnical Engineering
In this paper, the theory about electro-osmotic treatment of soil is summarized. The correlation between conventional soil char-acteristics and the most important electro-osmotic parameters, soil resistivity and electro-osmotic permeability coefficient, is indicated. Two case records exemplify the correlation between theory and reality. One of the case records concerns improvement of the preconsolidation pressure of a clay layer situated underneath a lake, which had to be filled with sand to create a building site, 800 m2 in size, for a magazine to be built. The electrodes consisted of iron rails with a weight of 25 kg/m. No dewatering at the …
Strengthening Of Clay Soils Of Buildings Bases Under Reconstruction By Means Of Alkalization, F. E. Volkov, L. N. Gera
Strengthening Of Clay Soils Of Buildings Bases Under Reconstruction By Means Of Alkalization, F. E. Volkov, L. N. Gera
International Conference on Case Histories in Geotechnical Engineering
The experience of use of natrium hydroxide solutions for strengthening of clay soils of buildings bases under reconstruction in city Ufa is described. The method applied allows to increase the design soil resistance from 0.16 to 0.4 MPa and decrease the labour expenditures at site by 40 %.