Proceedings of the Institution of Civil Engineers, 1999
The prime mission of the International Knowledge Database for Ground Improvement Technologies (IK... more The prime mission of the International Knowledge Database for Ground Improvement Technologies (IKDGIT) is to foster worldwide technology transfer and know-how exchange, which will effectively contribute to advancing the state of engineering and construction practice and accelerate reliable use of innovative ground improvement geosystems for a variety of engineering applications. To achieve this goal, specifically in the areas of ground improvement, reinforcement and grouting, where practice has always preceded research and analytical developments, effective interaction between government, industry and academia must be established. For this purpose, the Technical Committee for Ground Improvement, Reinforcement and Grouting of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE TC-17) has undertaken the development of the IKDGIT, which provides a user-friendly framework for collecting data, conducting statistical analyses, screening and presenting data via the Internet in order to provide widespread dissemination to engineers around the world. For the development of the IKDGIT, it is envisioned that through the network of Regional Centers to be established in ISSMGE country members, TC-17 members will participate not only in data collection but also in the evaluation of the available data, so that any data accessible to the international community through the IKD would have been evaluated by the experts of TC-17.
Volume II was essentially prepared as an Appendix of supporting information for Volume I. This vo... more Volume II was essentially prepared as an Appendix of supporting information for Volume I. This volume contains much of the supporting theory and a summary of the research used to verify the design approach contained in Volume I, as well as general information concerning proprietary reinforced soil systems. The information provided in this volume is not required for design evaluation and as such Volume I can stand alone. The basis for this volume was the NCHRP Report 290, "Reinforcement of Earth Slopes and Embankments" (Mitchell and Ville!, 1987) and the research program performed as part of the contract to develop the design guidelines contained in Volume I. A summary of that research program is contained in the Introduction section of this volume.
The use of a specially designed hollow cylinder cell in the measurement, under laboratory control... more The use of a specially designed hollow cylinder cell in the measurement, under laboratory controlled conditions, of the lateral stress and the excess pore water pressure induced by a cavity expansion in both clayey and granular soils is discussed. The hollow cylinder cell permits the performance of a cavity expansion test in an annular soil specimen under three independent stresses (i.e., axial stress, radial cavity pressure, and lateral confining stress) with measurement of cavity volume change and excess pore water pressures at several locations in the soil specimen. Effective stress analysis of the soil response to the cavity expansion illustrates that the effective lateral stress is independent of the specimen geometry, and intrinsic effective stress-strain relationships can be derived from the experimental expansion curve. However, the specimen geometry does affect the excess pore water pressure generated under undrained conditions, and, therefore, the total stress analysis con...
This research aims to simulate bio-contamination risk propagation under real-life conditions in t... more This research aims to simulate bio-contamination risk propagation under real-life conditions in the water distribution system (WDS) of Lille University's Scientific City Campus (France), solving the source identification and the response modeling. Neglecting dynamic reactions and not considering the possible chemical decay of most of the contaminants leads to an overestimation of the exposed population. Therefore, unlike the available event detection models, this study considers the interrelated change of several water-quality parameters such as free chlorine concentration, pH, alkalinity, and total organic carbon (TOC) resulting from the pollutants blending. In fact, starting from regular WDS monitoring, the baseline thresholds for each of the mentioned parameters are established; then, significant deviations from the baseline are used as indication for contaminations. For this reason, the purpose of the research was to develop and demonstrate the feasibility of an artificial i...
Proceedings of the Institution of Civil Engineers - Ground Improvement, 1999
This series of papers summarizes the research project initiated in 1993 by the US Federal Highway... more This series of papers summarizes the research project initiated in 1993 by the US Federal Highway Administration to review the state of practice, case studies and design methods of micropile group systems. Following a brief description of the recently adopted classification system for micropile design previously outlined by Bruce et al. (1997) (part 1), this paper (part 2) presents a summary of recommendations for the design of single micropiles and groups and networks of micropiles for selected engineering applications, including direct structural support and in situ soil reinforcement. Preliminary estimates of the ultimate axial and lateral capacity of micropiles, as outlined by different authors, are presented first. Design guidelines which have been developed generally through observations on full-scale testing and field experiences are discussed with regard to cohesionless soils, cohesive soils and rocks. Group and network effects are investigated and preliminary conclusions ar...
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1990
Soil nailing is an in-situ soil reinforcement technique which has been used during the last two d... more Soil nailing is an in-situ soil reinforcement technique which has been used during the last two decades mainly in France and Germany to retain excavations or stabilize slopes. Design of nailed soil systems has been traditionally done using slope stability analysis methods. These methods have been modified to incorporate the effect of the available tension and shear forces in the passive reinforcements on the slope stability. However, they provide only a global safety factor. This paper presents a limit analysis design approach which provides estimation of maximum tension and shear forces mobilized in each reinforcement. To verify the applicability of the method, the predicted forces are compared with those measured in both laboratory models and full scale structures.(a) for the covering abstract of the symposium see IRRD 818063.
Proceedings of the Institution of Civil Engineers, 1999
The prime mission of the International Knowledge Database for Ground Improvement Technologies (IK... more The prime mission of the International Knowledge Database for Ground Improvement Technologies (IKDGIT) is to foster worldwide technology transfer and know-how exchange, which will effectively contribute to advancing the state of engineering and construction practice and accelerate reliable use of innovative ground improvement geosystems for a variety of engineering applications. To achieve this goal, specifically in the areas of ground improvement, reinforcement and grouting, where practice has always preceded research and analytical developments, effective interaction between government, industry and academia must be established. For this purpose, the Technical Committee for Ground Improvement, Reinforcement and Grouting of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE TC-17) has undertaken the development of the IKDGIT, which provides a user-friendly framework for collecting data, conducting statistical analyses, screening and presenting data via the Internet in order to provide widespread dissemination to engineers around the world. For the development of the IKDGIT, it is envisioned that through the network of Regional Centers to be established in ISSMGE country members, TC-17 members will participate not only in data collection but also in the evaluation of the available data, so that any data accessible to the international community through the IKD would have been evaluated by the experts of TC-17.
Volume II was essentially prepared as an Appendix of supporting information for Volume I. This vo... more Volume II was essentially prepared as an Appendix of supporting information for Volume I. This volume contains much of the supporting theory and a summary of the research used to verify the design approach contained in Volume I, as well as general information concerning proprietary reinforced soil systems. The information provided in this volume is not required for design evaluation and as such Volume I can stand alone. The basis for this volume was the NCHRP Report 290, "Reinforcement of Earth Slopes and Embankments" (Mitchell and Ville!, 1987) and the research program performed as part of the contract to develop the design guidelines contained in Volume I. A summary of that research program is contained in the Introduction section of this volume.
The use of a specially designed hollow cylinder cell in the measurement, under laboratory control... more The use of a specially designed hollow cylinder cell in the measurement, under laboratory controlled conditions, of the lateral stress and the excess pore water pressure induced by a cavity expansion in both clayey and granular soils is discussed. The hollow cylinder cell permits the performance of a cavity expansion test in an annular soil specimen under three independent stresses (i.e., axial stress, radial cavity pressure, and lateral confining stress) with measurement of cavity volume change and excess pore water pressures at several locations in the soil specimen. Effective stress analysis of the soil response to the cavity expansion illustrates that the effective lateral stress is independent of the specimen geometry, and intrinsic effective stress-strain relationships can be derived from the experimental expansion curve. However, the specimen geometry does affect the excess pore water pressure generated under undrained conditions, and, therefore, the total stress analysis con...
This research aims to simulate bio-contamination risk propagation under real-life conditions in t... more This research aims to simulate bio-contamination risk propagation under real-life conditions in the water distribution system (WDS) of Lille University's Scientific City Campus (France), solving the source identification and the response modeling. Neglecting dynamic reactions and not considering the possible chemical decay of most of the contaminants leads to an overestimation of the exposed population. Therefore, unlike the available event detection models, this study considers the interrelated change of several water-quality parameters such as free chlorine concentration, pH, alkalinity, and total organic carbon (TOC) resulting from the pollutants blending. In fact, starting from regular WDS monitoring, the baseline thresholds for each of the mentioned parameters are established; then, significant deviations from the baseline are used as indication for contaminations. For this reason, the purpose of the research was to develop and demonstrate the feasibility of an artificial i...
Proceedings of the Institution of Civil Engineers - Ground Improvement, 1999
This series of papers summarizes the research project initiated in 1993 by the US Federal Highway... more This series of papers summarizes the research project initiated in 1993 by the US Federal Highway Administration to review the state of practice, case studies and design methods of micropile group systems. Following a brief description of the recently adopted classification system for micropile design previously outlined by Bruce et al. (1997) (part 1), this paper (part 2) presents a summary of recommendations for the design of single micropiles and groups and networks of micropiles for selected engineering applications, including direct structural support and in situ soil reinforcement. Preliminary estimates of the ultimate axial and lateral capacity of micropiles, as outlined by different authors, are presented first. Design guidelines which have been developed generally through observations on full-scale testing and field experiences are discussed with regard to cohesionless soils, cohesive soils and rocks. Group and network effects are investigated and preliminary conclusions ar...
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1990
Soil nailing is an in-situ soil reinforcement technique which has been used during the last two d... more Soil nailing is an in-situ soil reinforcement technique which has been used during the last two decades mainly in France and Germany to retain excavations or stabilize slopes. Design of nailed soil systems has been traditionally done using slope stability analysis methods. These methods have been modified to incorporate the effect of the available tension and shear forces in the passive reinforcements on the slope stability. However, they provide only a global safety factor. This paper presents a limit analysis design approach which provides estimation of maximum tension and shear forces mobilized in each reinforcement. To verify the applicability of the method, the predicted forces are compared with those measured in both laboratory models and full scale structures.(a) for the covering abstract of the symposium see IRRD 818063.
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Papers by Ilan Juran