Dr. Edil is a Distinguished Member of the American Society of Civil Engineers and a Diplomate of Geotechnical Engineering. He has been an active researcher and educator over 40 years at the University of Wisconsin-Madison. Professor Emeritus Edil is currently serving as Director of the new Recycled Materials Resource Center (RMRC-4G). His expertise includes use of recycled materials and sustainable construction, landfill liners and chemical transport, coastal erosion and landslides, soft soils and peat engineering, ground improvement, and use of geosynthetics.
The dynamic response of a large number of uniform-sized, dry sands and a limited number of improv... more The dynamic response of a large number of uniform-sized, dry sands and a limited number of improved gradations was obtained from resonant column tests, and the data were analyzed to evaluate the effects of grain characteristics (size, gradation, shape, surface texture) and other test variables (e.g., ambient stress conditions, void ration or relative density, strain amplitude, number of loading cycles) on the dynamic shear modulus and the damping capacity. The test results indicate that mean principal stress, density, and strain amplitude exert the strongest influence on both the modulus and damping capacity. Shear modulus is further influenced by roundness (used to characterize shape); the effects of the other parameters are either virtually zero or very small. Damping capacity is essentially independent of roundness and the other parameters, but it is influenced by the number of loading cycles. The test results were evaluated using multiple linear regression analysis, and empirical relationships correlating shear modulus and damping capacity to the important controlling parameters were obtained. The applicability of these relationships on other sands was assessed in a secondary testing program utilizing six different sand samples. The proposed relationships and relationships proposed by other investigators were compared with the experimental data. /Author/
Coastal slopes (also called cliffs or bluffs) often are subject to active erosion processes such ... more Coastal slopes (also called cliffs or bluffs) often are subject to active erosion processes such that their morphology, and thus their stability, is changing rapidly. There may be several erosion processes including active toe erosion that initiates other processes such as surface erosion and landslides. These concepts are presented based on observations of the bluffs along the shorelines of the Great Lakes (specifically Lakes Michigan and Superior) over a period of nearly 40 years. These lakes are subject to large lake level fluctuations and high waves. Superimposed on these on-going natural processes are the expected changes in the patterns due to climate change. The bluff materials have markedly different engineering properties along each lake. The state of knowledge with respect to shore erosion and associated bluff stability issues is presented including the available methods of predicting rate of erosion and determining bluff stability along with the controlling factors. The approaches to mitigating coastal recession are also described. The cost-effective solutions often are a combination of both stabilization and management approaches to minimize the impact.
A large-scale recycling and reuse application of scrap shingles would utilize an otherwise wasted... more A large-scale recycling and reuse application of scrap shingles would utilize an otherwise wasted resource while clearing landfill space and creating new business opportunities. One potential reuse application is the use of reclaimed asphalt shingles (RAS) as an additive or substitute for the earth materials typically used in the aggregate base (AB) and subbase (ASB) layers of roadway pavements. The purpose of this study was to determine the technical specifications of RAS, the effect of fly ash stabilization on RAS strength, and the practicality of the widespread implementation of RAS in the AB and ASB layers of roadway pavements. RAS, fly ash stabilized RAS (S-RAS), RAS-aggregate mixtures, and RAS-silt mixtures were evaluated for particle size characteristics, compaction characteristics, CA Bearing Ratio (CBR), unconfined compressive strength, and resilient modulus. According to the results of the testing protocol, unstabilized RAS is unsuitable as base material although RAS could potentially be used as subbase or general fill material. RAS-aggregate mixtures are suitable for use as subbase and are potentially suitable as base course in an unstabilized state; however, RAS-aggregate mixtures exhibited decreasing resilient modulus with increasing RAS content. Fly ash stabilized RAS (S-RAS) was less susceptible to penetrative deformation than unstabilized RAS, however, S-RAS was still highly susceptible to penetrative deformation when unpaved. Fly ash stabilization of RAS generally provided less improvement in resilient modulus compared to fly ash stabilized low-plasticity clays. This may be due to the high asphalt content of RAS particles and resulting diminishment in pozzolanic activity and/or the diminished particle interconnectedness for cementation. Other forms of stabilization, such as cold asphalt emulsion, may be more effective in strengthening RAS. Further evaluation of alternative stabilization methods and additional studies to evaluate the practicality of RAS in other geotechnical applications such as embankment fill, filter, and/or drainage material are recommended.
... strength (ie, undrained strength divided by effective consolidation pressure) for normally co... more ... strength (ie, undrained strength divided by effective consolidation pressure) for normally consolidated peats, as determined from isotropically or anisotropically consolidated undrained triaxial compression tests, does not appear to depend on organic content, type of peat, or type ...
Compression of peat and organic clay deposits is characterized using a simple rheological model i... more Compression of peat and organic clay deposits is characterized using a simple rheological model in which structural viscosity is assumed to be linear. The model utilizes three empirical parameters pertaining to primary compression, secondary compression, and rate of secondary compression, respectively. The parameters for primary and secondary compressibility depend on the stress level. The secondary compressibility and the rate factor for secondary compression are non-linear.
Bu calismada, periyodik olarak yapilan gozlemsel incelemelerin ve degerlendirmelerin rolu tartisi... more Bu calismada, periyodik olarak yapilan gozlemsel incelemelerin ve degerlendirmelerin rolu tartisilmistir. Cesitli olcum aletlerinin etkili kullanimi, surekli ve guvenilir verilerin temini ve verilerin kayit altina alinmasi ve degerlendirilmeleri tartisilmistir. Barajlarin emniyeti; sosyal, ekonomik ve cevresel faktorler bakimindan oldukca onemlidir. Baraj emniyeti icin yapilan detayli gozlemsel inceleme ve degerlendirmeler, barajlarin onemine, karmasik tasarimina ve barajin hasar gorme seviyesine gore degisiklik gostermektedir. Barajlarin emniyeti icin barajlarda yapilan olcum sonuclarinin kayit altina alinmasi ve gerekli durumlarda arazi ve laboratuvar deneylerinin yapilmasi onem tasimaktadir. Baraj emniyeti degerlendirmelerinde, farkli disiplinlerdeki uzmanlarin birlikte calismalari onemlidir. Barajlarin ve ilave yapilarinin emniyetinin incelenmesinde sadece nicel veriler degil ayni zamanda sozel ifadelerinde bilgisayar ortaminda kayit altina alinmasi oldukca onemlidir.
Proceedings of International Structural Engineering and Construction, 2016
Recently, an innovative soft soil improvement method was advanced in China by integrating and mod... more Recently, an innovative soft soil improvement method was advanced in China by integrating and modifying vacuum consolidation and dynamic compaction ground improvement techniques in an intelligent and controlled manner. This innovative soft soil improvement method is referred to as “High Vacuum Densification Method (HVDM)” to reflect its combined use of vacuum de-watering and dynamic compaction techniques in cycles. Over the past ten years, this innovative soft soil improvement technique has been successfully used in China and Asia for numerous large-scale soft soil improvement projects, from which enormous time and cost savings have been achieved. In this presentation, the working principles of the HVDM will be described. A discussion of the range of fine-grained, cohesive soil properties that would make them ideal for applying HVDM as an efficient ground improvement method will be discussed. The economic benefits and environmental benefits of HVDM are elucidated.
... values for the void ratio and is therefore invalid; in this case, the more conventional compr... more ... values for the void ratio and is therefore invalid; in this case, the more conventional compressionindex, Cc, tends to govern the compressibility. Page 18. KRIZEK ON HIGH WATER CONTENT MATERIALS From this equation, it follows that the coefficient of compressibility, av, is ...
The dynamic response of a large number of uniform-sized, dry sands and a limited number of improv... more The dynamic response of a large number of uniform-sized, dry sands and a limited number of improved gradations was obtained from resonant column tests, and the data were analyzed to evaluate the effects of grain characteristics (size, gradation, shape, surface texture) and other test variables (e.g., ambient stress conditions, void ration or relative density, strain amplitude, number of loading cycles) on the dynamic shear modulus and the damping capacity. The test results indicate that mean principal stress, density, and strain amplitude exert the strongest influence on both the modulus and damping capacity. Shear modulus is further influenced by roundness (used to characterize shape); the effects of the other parameters are either virtually zero or very small. Damping capacity is essentially independent of roundness and the other parameters, but it is influenced by the number of loading cycles. The test results were evaluated using multiple linear regression analysis, and empirical relationships correlating shear modulus and damping capacity to the important controlling parameters were obtained. The applicability of these relationships on other sands was assessed in a secondary testing program utilizing six different sand samples. The proposed relationships and relationships proposed by other investigators were compared with the experimental data. /Author/
Coastal slopes (also called cliffs or bluffs) often are subject to active erosion processes such ... more Coastal slopes (also called cliffs or bluffs) often are subject to active erosion processes such that their morphology, and thus their stability, is changing rapidly. There may be several erosion processes including active toe erosion that initiates other processes such as surface erosion and landslides. These concepts are presented based on observations of the bluffs along the shorelines of the Great Lakes (specifically Lakes Michigan and Superior) over a period of nearly 40 years. These lakes are subject to large lake level fluctuations and high waves. Superimposed on these on-going natural processes are the expected changes in the patterns due to climate change. The bluff materials have markedly different engineering properties along each lake. The state of knowledge with respect to shore erosion and associated bluff stability issues is presented including the available methods of predicting rate of erosion and determining bluff stability along with the controlling factors. The approaches to mitigating coastal recession are also described. The cost-effective solutions often are a combination of both stabilization and management approaches to minimize the impact.
A large-scale recycling and reuse application of scrap shingles would utilize an otherwise wasted... more A large-scale recycling and reuse application of scrap shingles would utilize an otherwise wasted resource while clearing landfill space and creating new business opportunities. One potential reuse application is the use of reclaimed asphalt shingles (RAS) as an additive or substitute for the earth materials typically used in the aggregate base (AB) and subbase (ASB) layers of roadway pavements. The purpose of this study was to determine the technical specifications of RAS, the effect of fly ash stabilization on RAS strength, and the practicality of the widespread implementation of RAS in the AB and ASB layers of roadway pavements. RAS, fly ash stabilized RAS (S-RAS), RAS-aggregate mixtures, and RAS-silt mixtures were evaluated for particle size characteristics, compaction characteristics, CA Bearing Ratio (CBR), unconfined compressive strength, and resilient modulus. According to the results of the testing protocol, unstabilized RAS is unsuitable as base material although RAS could potentially be used as subbase or general fill material. RAS-aggregate mixtures are suitable for use as subbase and are potentially suitable as base course in an unstabilized state; however, RAS-aggregate mixtures exhibited decreasing resilient modulus with increasing RAS content. Fly ash stabilized RAS (S-RAS) was less susceptible to penetrative deformation than unstabilized RAS, however, S-RAS was still highly susceptible to penetrative deformation when unpaved. Fly ash stabilization of RAS generally provided less improvement in resilient modulus compared to fly ash stabilized low-plasticity clays. This may be due to the high asphalt content of RAS particles and resulting diminishment in pozzolanic activity and/or the diminished particle interconnectedness for cementation. Other forms of stabilization, such as cold asphalt emulsion, may be more effective in strengthening RAS. Further evaluation of alternative stabilization methods and additional studies to evaluate the practicality of RAS in other geotechnical applications such as embankment fill, filter, and/or drainage material are recommended.
... strength (ie, undrained strength divided by effective consolidation pressure) for normally co... more ... strength (ie, undrained strength divided by effective consolidation pressure) for normally consolidated peats, as determined from isotropically or anisotropically consolidated undrained triaxial compression tests, does not appear to depend on organic content, type of peat, or type ...
Compression of peat and organic clay deposits is characterized using a simple rheological model i... more Compression of peat and organic clay deposits is characterized using a simple rheological model in which structural viscosity is assumed to be linear. The model utilizes three empirical parameters pertaining to primary compression, secondary compression, and rate of secondary compression, respectively. The parameters for primary and secondary compressibility depend on the stress level. The secondary compressibility and the rate factor for secondary compression are non-linear.
Bu calismada, periyodik olarak yapilan gozlemsel incelemelerin ve degerlendirmelerin rolu tartisi... more Bu calismada, periyodik olarak yapilan gozlemsel incelemelerin ve degerlendirmelerin rolu tartisilmistir. Cesitli olcum aletlerinin etkili kullanimi, surekli ve guvenilir verilerin temini ve verilerin kayit altina alinmasi ve degerlendirilmeleri tartisilmistir. Barajlarin emniyeti; sosyal, ekonomik ve cevresel faktorler bakimindan oldukca onemlidir. Baraj emniyeti icin yapilan detayli gozlemsel inceleme ve degerlendirmeler, barajlarin onemine, karmasik tasarimina ve barajin hasar gorme seviyesine gore degisiklik gostermektedir. Barajlarin emniyeti icin barajlarda yapilan olcum sonuclarinin kayit altina alinmasi ve gerekli durumlarda arazi ve laboratuvar deneylerinin yapilmasi onem tasimaktadir. Baraj emniyeti degerlendirmelerinde, farkli disiplinlerdeki uzmanlarin birlikte calismalari onemlidir. Barajlarin ve ilave yapilarinin emniyetinin incelenmesinde sadece nicel veriler degil ayni zamanda sozel ifadelerinde bilgisayar ortaminda kayit altina alinmasi oldukca onemlidir.
Proceedings of International Structural Engineering and Construction, 2016
Recently, an innovative soft soil improvement method was advanced in China by integrating and mod... more Recently, an innovative soft soil improvement method was advanced in China by integrating and modifying vacuum consolidation and dynamic compaction ground improvement techniques in an intelligent and controlled manner. This innovative soft soil improvement method is referred to as “High Vacuum Densification Method (HVDM)” to reflect its combined use of vacuum de-watering and dynamic compaction techniques in cycles. Over the past ten years, this innovative soft soil improvement technique has been successfully used in China and Asia for numerous large-scale soft soil improvement projects, from which enormous time and cost savings have been achieved. In this presentation, the working principles of the HVDM will be described. A discussion of the range of fine-grained, cohesive soil properties that would make them ideal for applying HVDM as an efficient ground improvement method will be discussed. The economic benefits and environmental benefits of HVDM are elucidated.
... values for the void ratio and is therefore invalid; in this case, the more conventional compr... more ... values for the void ratio and is therefore invalid; in this case, the more conventional compressionindex, Cc, tends to govern the compressibility. Page 18. KRIZEK ON HIGH WATER CONTENT MATERIALS From this equation, it follows that the coefficient of compressibility, av, is ...
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