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Articles 10711 - 10740 of 21775
Full-Text Articles in Engineering
An “Unexpected” Rock Failure In A Limestone Open Pit Mine, D. Lo Presti, M. Cravero, G. Iabichino
An “Unexpected” Rock Failure In A Limestone Open Pit Mine, D. Lo Presti, M. Cravero, G. Iabichino
International Conference on Case Histories in Geotechnical Engineering
On 28th October 2004 a rock failure occurred in a limestone open pit quarry in Tuscany (Italy). The phenomenon evolved slowly with the collapse of about 1000 cubic meters. The complex failure mechanism mainly involved plane sliding along stratifications with rotation and block toppling. The phenomenon continued to evolve slowly and on 3rd November failure extended to the neighbouring portion of rock with a total collapse of about 5000 cubic meters of rock. Failure analysis took advantage of an accurate characterization of geology, geometry and mechanical properties of the collapsed rock mass. Such analysis led to the conclusion that the …
Application Of Numerical Modelling To Study The Efficiency Of Roof Bolting Pattern In East 1 Main Gate Of Tabas Coal Mine, S. Taghipoor
Application Of Numerical Modelling To Study The Efficiency Of Roof Bolting Pattern In East 1 Main Gate Of Tabas Coal Mine, S. Taghipoor
International Conference on Case Histories in Geotechnical Engineering
Tabas mechanized underground coal mine, locating in mid eastern of Iran, has been designed to produce 1.5 million tone coal annually. To start driving the first (East 1) panel's main gate and tail gate, a 7+6 pattern of 2.4 m roof bolts was considered to be applied in both gates together with 4 and 3 side bolts at left and right ribs, respectively. In this paper, 2D numerical modelling using FLAC program is implemented to assess the efficiency of the roof bolting pattern in the east 1 main gate of the mine. The output of the modelling, in the form …
Characterization Of A Weak Rock Mass And Geoengineering Analyses For A Canyon Landfill In Northern California, Dimitrios Zekkos, Julien Cohen-Waeber, Edmund Medley, Chris Hunt, Krzysztof Jesionek
Characterization Of A Weak Rock Mass And Geoengineering Analyses For A Canyon Landfill In Northern California, Dimitrios Zekkos, Julien Cohen-Waeber, Edmund Medley, Chris Hunt, Krzysztof Jesionek
International Conference on Case Histories in Geotechnical Engineering
A case history of extensive 60-m high excavations in a weak rock mass for a canyon landfill in Northern California is presented. The landfill is underlain by the Panoche Formation, a complex series of sandstones, siltstones, claystones, shales and conglomerates, thought to be dominantly turbidites, deposited as sub-sea fan deposits. As part of the design, kinematic analyses were performed, accompanied by two independent approaches used to evaluate the strength of the rock mass. One approach was based on laboratory rock core testing, while the second approach was based on the Hoek and Brown Criterion using mostly field observations. The two …
Columnar Basalt – Vibration Study And Preservation Methods At Mumbai, India, S. Y. Mhaiskar, R. A. Hegde, C. R. Tata
Columnar Basalt – Vibration Study And Preservation Methods At Mumbai, India, S. Y. Mhaiskar, R. A. Hegde, C. R. Tata
International Conference on Case Histories in Geotechnical Engineering
The Gilbert Hill is situated west of the Andheri railway station on western railway line in Mumbai, India. The present hill is practically a vertical monolith that rises about 60 meters (200 ft) above the surrounding ground level. The hill displays beautiful vertical columnar jointing that extends from the top to the bottom. Because of its rare and almost unique occurrence the hill with columnar joints is important geologically and historically. Hence, this hill needs to be preserved. The jointing is very well exposed in the western, northern and eastern parts. In the southern part there is rolled down debris …
Construction Of Express Subway Line Eole In Paris, Verya Nasri, Philippe Fauvel
Construction Of Express Subway Line Eole In Paris, Verya Nasri, Philippe Fauvel
International Conference on Case Histories in Geotechnical Engineering
EOLE is the line E of the Paris express subway network serving two new stations: Magenta and Haussmann, located in the capital’s most important business districts. The project is designed to provide relief to the current network which had reached saturation in the East-West direction where the public resides in the East and work in the West. With its subterraneous network of connections and passageways, EOLE is a vast underground complex, a place of constant exchange with the urban environment, set in the very heart of Paris. Conquering the underground, supporting the city, domesticating space, architectonising concrete, bringing light under …
Empirical Correlations Of Longwall Subsidence Data For The Illinois Coal Basin, Gennaro G. Marino, Mohamed Gamal, Nagesh Malyala
Empirical Correlations Of Longwall Subsidence Data For The Illinois Coal Basin, Gennaro G. Marino, Mohamed Gamal, Nagesh Malyala
International Conference on Case Histories in Geotechnical Engineering
Subsidence, mining and site data has been collected over a number of longwall panels in the Illinois Basin. Using this data, empirical correlations are attempted to various subsidence parameters, including maximum vertical and horizontal displacement, subsidence slope and curvature and horizontal strain. Also, the corresponding locations of these various subsidence characteristics are correlated to the associated site conditions. An extensive list of definitions are provided for the various subsidence parameters utilized in the paper.
Movements Induced By Tunneling With An Epb Machine In Over Consolidated Soils: Compans Monitoring Section Of Toulouse Subway Line B, Fabrice Emeriault, Richard Kastner, Emilie Vanoudheusden
Movements Induced By Tunneling With An Epb Machine In Over Consolidated Soils: Compans Monitoring Section Of Toulouse Subway Line B, Fabrice Emeriault, Richard Kastner, Emilie Vanoudheusden
International Conference on Case Histories in Geotechnical Engineering
A part of Toulouse’s underground line B has been excavated by a 7.8 meters diameter earth-pressure balance machine. A comprehensive monitoring section has been installed in the Compans garden at a point where the tunnel cover is 12.8-meter and is running through overconsolidated clayey molasses underlying a 6.8 meters layer of made ground and gravels. The monitoring devices give full information on the ground movements above the tunnel and on deformations of the tunnel lining. Vertical movements are measured by 5 multipoint borehole extensometers with automatic data acquisition (every 5 seconds when the TBM crosses the monitoring section). At the …
Use Of Strengthening Cementation When Civil Structures On Karsted Territories Construction, F. E. Volkov, L. N. Gera
Use Of Strengthening Cementation When Civil Structures On Karsted Territories Construction, F. E. Volkov, L. N. Gera
International Conference on Case Histories in Geotechnical Engineering
The paper describes measures on strengthening cementation of karsted territories both when erection of new houses and in failure situations. The result of strengthening cementation is water resistant strong base preventing development of karst-suffosion processes.
Shape Optimization Of Tunnel By Finite Element Method, M. S. Ranadive
Shape Optimization Of Tunnel By Finite Element Method, M. S. Ranadive
International Conference on Case Histories in Geotechnical Engineering
The stresses around the periphery of tunnel openings are in general independent of factors such as size of the opening and elastic modulus of surrounding geotechnical material. The stresses however depend upon the shape of the opening and the residual stresses. At any point over the periphery the significant stresses are the normal stresses in the direction tangential to the opening periphery. By trials involving appropriate modifications to the finite element idealization, the shape of the opening could be derived such that the tangential tensile stresses are minimized and simultaneously the compressive tangential stresses are below the permissible limits. Though, …
Design And Construction Of Drilled Shafts In Karst Environments Of Florida, Amy L. Guisinger, Ching L. Kuo, Teresa Puckett
Design And Construction Of Drilled Shafts In Karst Environments Of Florida, Amy L. Guisinger, Ching L. Kuo, Teresa Puckett
International Conference on Case Histories in Geotechnical Engineering
Drilled shafts have been widely used as bridge foundation alternatives for more than a decade in Florida. The majority of the drilled shafts are designed to embed into the underlying limestone. However, many unforeseen conditions have been encountered during the construction of drilled shafts due to karst environments, especially in the Tampa Bay area where sinkhole occurrences are common. This paper presents a case history of the design and construction of drilled shaft foundations for the I-4/I-275 Downtown Interchange in Tampa, Florida. A two-phase procedure utilized by the Florida Department of Transportation (FDOT) was adopted to minimize the impact of …
A Case Study On Rectification Of Damaged Structures On Expansive Soil Deposits, J. M. Kate
A Case Study On Rectification Of Damaged Structures On Expansive Soil Deposits, J. M. Kate
International Conference on Case Histories in Geotechnical Engineering
During the year 1995, at Anta (India) gas power project township a large number of structures, which were constructed 4 to 6 years back started exhibiting damages of varying degree. From the nature and pattern of damages it appeared to be typical of distress due to expansive soil deposits underneath. In order to assess/investigate the causes for damages and suggest remedial measures, boreholes were drilled at suitable locations and soil samples were collected from different depths. Free swell index, percentage swell, swelling pressure and other relevant characteristics of soil samples were determined. The corrective measures suggested to salvage/rectify the distressed …
A Combination Of Artificial Ground Freezing And Grouting For The Excavation Of A Large Size Tunnel Below Groundwater, Vittorio Manassero, Giuseppe Di Salvo, Fabio Giannelli, Giuseppe Colombo
A Combination Of Artificial Ground Freezing And Grouting For The Excavation Of A Large Size Tunnel Below Groundwater, Vittorio Manassero, Giuseppe Di Salvo, Fabio Giannelli, Giuseppe Colombo
International Conference on Case Histories in Geotechnical Engineering
Within the Metro Line 1 extension project in Napoli (Italy), the service tunnel at Toledo station was one of the most critical sections of the project. The 13m wide, 17m high, 40m long tunnel is located downtown under a deeply urbanized area. It was excavated starting from an access shaft and from this tunnel four platform tunnels are under excavation. The geology of the site is characterized by volcanic soils: loose pozzolana silty sand and tuff. The underground works were carried out under a hydrostatic head of 27 m. In order to allow a safe and substantially dry excavation, soil/rock …
Comparison Between Stone Columns And Vertical Geodrains With Preloading Embankment Techniques, Mounir Bouassida, Lassaad Hazzar
Comparison Between Stone Columns And Vertical Geodrains With Preloading Embankment Techniques, Mounir Bouassida, Lassaad Hazzar
International Conference on Case Histories in Geotechnical Engineering
In the framework of “Radès-La Goulette“bridge project (Tunisia), this study focuses on the construction of embankments located in north Lake of Tunis. These embankments with averaged height of about 6 m are founded on highly compressible clayey sand and muddy sand layers. A soil improvement technique is then imposed, to overcome the lack of low bearing capacity and high pronounced settlements. Two solutions of soil improvement have been studied; the first one consists in vertical “Geodrains” drilled until 10 m depth associated with step by step construction of preloading embankment. The second technique is stone columns reinforcement up to 10 …
Compressive Strength Of Repaired Road By Recycling Technique Of Pavement Materials, Runglawan Rachan, Suksun Horpibulsuk
Compressive Strength Of Repaired Road By Recycling Technique Of Pavement Materials, Runglawan Rachan, Suksun Horpibulsuk
International Conference on Case Histories in Geotechnical Engineering
The Department of Highways, Thailand, has used the pavement recycling technique to restore damaged pavement since 1965. This technique is economical because cement is readily available at reasonable cost in Thailand. From this study, it is found that the field roller-compacted strength, qufr is lower than the laboratory strength, qul under the same dry unit weight, soil-water/cement ratio and curing time due to several field factors. The ratio qufr/qul varies from 50 to 100%. Non-uniformity in mixing soil with cement is realized by the ratio of field hand-compacted strength to laboratory strength, qufh/q …
Construction Of Motorway On Double Porosity Clay Fill, Jan Najser, Emma Pooley, Sarah Springman, Jan Laue, Jan Boháč
Construction Of Motorway On Double Porosity Clay Fill, Jan Najser, Emma Pooley, Sarah Springman, Jan Laue, Jan Boháč
International Conference on Case Histories in Geotechnical Engineering
The paper describes the mechanical behaviour of double porosity clay fills. A trial embankment had been constructed on a 20-30 year-old landfill and monitored for 3 years. The embankment was instrumented by hydrostatic levelling profiles, surveying reference points, pore pressure gauges, inclinometers and depth reference points. Centrifuge modelling of the embankment behaviour on the consolidated landfill was carried out in the geotechnical centrifuge at ETH Zürich in Switzerland. The models were instrumented similarly to the real embankment with pore pressure transducers and a newly developed tool called “system of straws” for measurement of deformation at different depths. Surface deformations were …
Preface, Shamsher Prakash
Preface, Shamsher Prakash
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Conference Schedule, Multiple Authors
Conference Schedule, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
General Report — Session 5: Case Histories And Failure Of Retaining Structures, Slurry Walls, And Deep Foundations, Alex Sy, Yingwei (Alex) Wu, Jose Matos E Silva
General Report — Session 5: Case Histories And Failure Of Retaining Structures, Slurry Walls, And Deep Foundations, Alex Sy, Yingwei (Alex) Wu, Jose Matos E Silva
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
General Report — Session 6: Geological, Rock And Mining Engineering, Including Underground Structures And Excavations, And Subsidence Of Deltas, Dimitrios Zekkos, Amy L. Guisinger, Edmund Medley, Daniel A. Vellone
General Report — Session 6: Geological, Rock And Mining Engineering, Including Underground Structures And Excavations, And Subsidence Of Deltas, Dimitrios Zekkos, Amy L. Guisinger, Edmund Medley, Daniel A. Vellone
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
The Impact Of Low Probability Ground Motions On Canadian Geotechnical Engineering Practice, W. D. Liam Finn
The Impact Of Low Probability Ground Motions On Canadian Geotechnical Engineering Practice, W. D. Liam Finn
International Conference on Case Histories in Geotechnical Engineering
The adoption of design motions with a 2% rate of exceedance in 50 years in the National Building Code of Canada (NBCC 2005) has had a major impact on geotechnical engineering practice in Canada. The peak ground accelerations were doubled compared with the previous motions which had an exceedance rate of 10% in 50 years. The increase in accelerations has had a huge effect on assessments of liquefaction potential and slope stability, because the methods of assessment in common use depend on peak ground acceleration. This paper describes typical problems encountered in Canadian practice with use of the low probability …
An Analysis Of Causes Of Urban Landslides In Residual Lateritic Soil, Rajib Kumar Goswami, Baleshwar Singh
An Analysis Of Causes Of Urban Landslides In Residual Lateritic Soil, Rajib Kumar Goswami, Baleshwar Singh
International Conference on Case Histories in Geotechnical Engineering
Landslides in natural slopes of residual soil are a common problem encountered in tropical regions. Guwahati city, located in Assam in the north-eastern part of India, is an urban watershed covered by a number of hills and hillocks that are capped with lateritic soil. Although the slopes originally consisted of hard and strong rocks, their stability have been impaired by weathering, heavy rainfall and seepage flows. Encroachments and cuttings on the hill slopes due to unplanned urbanisation and earthquake tremors have aggravated the problem. A study of landslides was undertaken focussing on degree of weathering of the rock units, their …
Application Of Screening Analyses For The Stability Of Landslide In Seymareh Dam Project, M. Yazdani, M. Fadaee, A. Eslami Haghighat
Application Of Screening Analyses For The Stability Of Landslide In Seymareh Dam Project, M. Yazdani, M. Fadaee, A. Eslami Haghighat
International Conference on Case Histories in Geotechnical Engineering
Seymareh dam and hydropower plant project is located in western province of Ilam, in Iran. This concrete arch dam with 178m height and 196 m crest length is to be placed on Seymareh River, the axis of which is located on the north wing of an anticline including Asmari limestone layers. The dramatic variation of dip angle of bedding in this part of anticline has created many fractures that result in slides. In October 1st 2003, when excavation in the left bank was being operated to construct an access road to the valley, a large landslide triggered on the top …
Back-Analyses Of Landfill Slope Failures, Nejan Huvaj-Sarihan, Timothy D. Stark
Back-Analyses Of Landfill Slope Failures, Nejan Huvaj-Sarihan, Timothy D. Stark
International Conference on Case Histories in Geotechnical Engineering
This paper investigates the shear strength of municipal solid waste (MSW) using back analyses of failed waste slopes. Shear strength of MSW is a function of many factors such as waste type, composition, compaction, daily cover, moisture conditions, age, decomposition, overburden pressure, etc. These factors together with non-standardized sampling methods, insufficient sample size to be representative of in-situ conditions, and limited shear displacement or axial strain imposed during the shear tests affect the test results and have created considerable scatter in reported test results. This scatter led the authors to pursue the back-analysis of failed waste slopes as a better …
Case History Of Labor Accident Due To Slope Failure During Slope Excavation And Its Countermeasure Work, Kazuya Itoh, Sahaphol Timpong, Yasuo Toyosawa
Case History Of Labor Accident Due To Slope Failure During Slope Excavation And Its Countermeasure Work, Kazuya Itoh, Sahaphol Timpong, Yasuo Toyosawa
International Conference on Case Histories in Geotechnical Engineering
About 15 to 20 workers die annually in labor accidents attributed to slope failure or rock fall during slope excavations in Japan. In this paper, a case history of slope failure occurred during the reconstruction of retaining wall is presented. The geotechnical centrifuge model tests are conducted to investigate the mechanism of slope failure. This paper focuses on the influence of wall stiffness and embedded depths of sheet piles or pipes on the prevention of slope failure. Based on the centrifuge test, it was found that the simple temporary wall used during the trench excavation in this case history could …
Evaluation And Stabilisation Of An Embankment At Sebastopol, South Wales, Uk, Austin Weltman, Xun Yuan
Evaluation And Stabilisation Of An Embankment At Sebastopol, South Wales, Uk, Austin Weltman, Xun Yuan
International Conference on Case Histories in Geotechnical Engineering
This paper introduces a slope movement and related railway track movement at Sebastopol, South Wales, UK. The monitoring results including slope movements and groundwater levels are summarised and presented. The slope at Sebastopol has a long history of instability. Because of continued gradual movement of the railway line and accelerated movement in 2004, a series of small diameter ‘Grundomat’ micro-piles were installed alongside the track early in 2005 to increase the shear resistance of the underlying soil and to reduce the rate of slope movement to a small but manageable amount. The slope movements have been continuously monitored since the …
Failure Of The Embankment On Soft Soil In Recife-Brazil, Maria Isabela Marques Da Cunha V. Bello, Roberto Quental Coutinho, Alexandre Duarte Gusmão
Failure Of The Embankment On Soft Soil In Recife-Brazil, Maria Isabela Marques Da Cunha V. Bello, Roberto Quental Coutinho, Alexandre Duarte Gusmão
International Conference on Case Histories in Geotechnical Engineering
This paper presents the study of the rupture of an embankment on soft clay, localized in Recife, Brazil. The data was obtained from partnership of the Department of Civil Engineering of the Federal University of Pernambuco, Brazil and the company Gusmão Engineers Associates, which it was possible to perform a Master Thesis. The embankment was constructed without geotechnical investigation project, accompaniment and technological control. After the rupture, to understand the process, a geotechnical investigation was performed to permit a total stress stability analyze / back-analyze, considering circular and non-circular surfaces, occurrence of cracking in embankment, and the three-dimensional effect. The …
Geotechnical Schemes For Constructing Light Structures On Instable Slopes, Farzad Farrokhzad, Asskar Janali-Zadeh
Geotechnical Schemes For Constructing Light Structures On Instable Slopes, Farzad Farrokhzad, Asskar Janali-Zadeh
International Conference on Case Histories in Geotechnical Engineering
Slopes in soils and rocks are natural or man-made structures. Landslide and slope failure are responsible for millions of dollars of damage to public and private property every year. The great variety of slope movements reflects the diversity of conditions that cause the slope to become unstable and the processes that trigger the movement. The stability of a slope can be threatened by erosion due to surface water runoff, or more severe erosive forces associated with water. In this paper the geotechnical schemes which were done for constructing light structure (aviculture) in Noabad (Mazandaran-Iran) by regarding to the movement of …
Horizontal Translational Failures Of Levees Due To Water Filled Gaps, Meindert A. Van, Cor Zwanenburg, John M. Van Esch, Michael K. Sharp, Reed L. Mosher
Horizontal Translational Failures Of Levees Due To Water Filled Gaps, Meindert A. Van, Cor Zwanenburg, John M. Van Esch, Michael K. Sharp, Reed L. Mosher
International Conference on Case Histories in Geotechnical Engineering
A peat levee at Wilnis in The Netherlands suddenly failed at the end of the relatively dry summer of 2003. On Monday, 29 August 2005, Hurricane Katrina struck the U.S. gulf coast and breached, among other failures, the 17th Street Canal. These failures triggered large research programs. In the Wilnis case, it was eventually deduced that the 5-m horizontal translation of the levee was triggered by a combination of reduced weight by evaporation, shrinkage and cracking of the peat material, and an increased head in the sand layer under the dike. A key factor in the 17th Street Canal failure …
Integrated Approach For Stabilisation Of Varunavat Parvat Landslide – A Case Study, R. S. T. Sai, S. K. Shukla, G. M. Prasad, R. K. Vishnoi, T. S. Routela
Integrated Approach For Stabilisation Of Varunavat Parvat Landslide – A Case Study, R. S. T. Sai, S. K. Shukla, G. M. Prasad, R. K. Vishnoi, T. S. Routela
International Conference on Case Histories in Geotechnical Engineering
Uttarkashi Township, located on the toe of the Varunavat Parvat, in the State of Uttarakhand in North India is known for having a history of a number of natural disasters. One of such disaster was a major landslide on the slopes of the Varunavat Parvat, in the year 2003. There had been huge loss of property of residential complexes, office buildings, hotels and many other business apartments. The risk of further such slides continuously hovered over the town which was the serious concern of District and State Authorities. An integrated approach of long term stabilization measures with flattening of slopes …
Investigation On Mechanism Of Creep Deformation Of Slopes In Woo-Wan-Chai Landslide Area, Taiwan, M. Chang, G. M. Chiang, S. D. Chen, Y. S. Zhang, H. C. Liu, C. F. Wu
Investigation On Mechanism Of Creep Deformation Of Slopes In Woo-Wan-Chai Landslide Area, Taiwan, M. Chang, G. M. Chiang, S. D. Chen, Y. S. Zhang, H. C. Liu, C. F. Wu
International Conference on Case Histories in Geotechnical Engineering
The creep deformation of slopes in Woo-wan-chai landslide area has been a serious problem for District V, Directorate General of Highways, Taiwan, in maintenance of Province Road 18 since opening. With a 3-Km long section being laid across the area, the road is a main access to Alishan National Scenic Area and Yushan National Park in Taiwan. To closely observe the slope deformation, a long-term monitoring program was set up at the site. Results indicated the deformation was intimately related to the rainfall, ground-water rise, and slope toe erosion, with an average sliding rate reached about 20mm/month. Causes and mechanism …