摘要 :
According to U.S. EPA, there are 488,496 confirmed cases of leaky underground storage tanks (UST) nationwide as of September 30, 2009. Soil contamination due to oil spills and leaky USTs has a direct impact on geotechnical propert...
展开
According to U.S. EPA, there are 488,496 confirmed cases of leaky underground storage tanks (UST) nationwide as of September 30, 2009. Soil contamination due to oil spills and leaky USTs has a direct impact on geotechnical properties of affected soil and, therefore, on already existing structures such as foundation embankments and clay liners. In addition, it has been a common practice to use contaminated soil as a fill material or roadway sub-base material. Therefore, it is necessary to investigate the effect of oil contamination on physical and mechanical properties of soil. Prior studies have shown the effect of pore fluid chemistry on the soil properties, such as permeability and shear strength. Dielectric constant and fluid viscosity have been found to have the major influence on soil behavior. However, the number of studies is very limited, especially when it is related to geotechnical properties of clays. The current study examines the effect of gasoline on geotechnical properties of high-plasticity and low-plasticity clay. Then, the effect of pore fluid properties on the observed behavior of clay is studied in closer details. The study demonstrated that dielectric constant alone can't be attributed to the changes in geotechnical properties of soil. Adsorption process, however, was found to influence soil properties at lower concentrations of contaminant.
收起
摘要 :
This paper has discussed the mechanism of compacted clay and the influence of compaction and penetration effected by different technological parameters such as particle composition and times of compaction etc. This research is imp...
展开
This paper has discussed the mechanism of compacted clay and the influence of compaction and penetration effected by different technological parameters such as particle composition and times of compaction etc. This research is important to ensure the quality of construction, accelerate the construction schedule, and provide reference for detection, evaluation and quality control of projects with similar requests.
收起
摘要 :
This paper has discussed the mechanism of compacted clay and the influence of compaction and penetration effected by different technological parameters such as particle composition and times of compaction etc. This research is imp...
展开
This paper has discussed the mechanism of compacted clay and the influence of compaction and penetration effected by different technological parameters such as particle composition and times of compaction etc. This research is important to ensure the quality of construction, accelerate the construction schedule, and provide reference for detection, evaluation and quality control of projects with similar requests.
收起
摘要 :
In all kinds of site investigation reports prepared to acquire the current situation of the project site, it is a common fact to perform the consistency tests which are specialized as Atterberg limit tests. Consistency can be defi...
展开
In all kinds of site investigation reports prepared to acquire the current situation of the project site, it is a common fact to perform the consistency tests which are specialized as Atterberg limit tests. Consistency can be defined as an important term, especially for fine-grained soils, to appoint the current state of the water content of soil formation in the field. Based on the ease and cost-effectiveness of the Atterberg tests, it has become a traditional solution to determine the fundamental design properties such as the rigidity and strength of the soil formation with the use of empirical approaches that are developed according to them. In this context, "compaction" can be an interesting term to investigate the appropriateness of determination of special characteristics of the phenomenon such as the optimum water content and the maximum dry unit weight with the development of a new perspective based on a simplest experimental process formed with only the evaluation of water content. Because it is a complicated and time-consuming process to apply the compaction test beginning of the sample preparation step to the ultimate evaluation step. Hence, in this paper, an integrated study is performed for highly plastic clays to acquire the consistency and the compaction properties together with a direct relationship. A huge database was prepared according to the data's given in the well-accepted literature sources by the transmission of liquid limit and plastic limit test results conducted for only the high plastic clays. Besides, simple equations are tried to be obtained to calculate the plasticity index and approximations are proposed to find the maximum dry unit weight and the optimum water content of the soil, respectively. As a result, the applicability of both the regression analysis and the artificial neural network studies to the attainment process of both consistency characteristics and compaction problem were compared with each other to procure a reliable d
收起
摘要 :
In this work we investigated six types of non-plastic clays from Pocos de Caldas, MG, Brazil. These clays powders were characterized by chemical and granulometric analysis, X-ray diffraction, BET technique, picnometry and particle...
展开
In this work we investigated six types of non-plastic clays from Pocos de Caldas, MG, Brazil. These clays powders were characterized by chemical and granulometric analysis, X-ray diffraction, BET technique, picnometry and particle size distribution. The green and sintered density of samples was determined. This study indicated that clays presented refractory minerals such as kaolinite and gibbsite. Small amounts of quartz, illite and vermiculite were also observed. According to the results, the clays can be classified into two different types, related to their refractoriness.
收起
摘要 :
In this work we investigated six types of non-plastic clays from Pocos de Caldas, MG, Brazil. These clays powders were characterized by chemical and granulometric analysis, X-ray diffraction, BET technique, picnometry and particle...
展开
In this work we investigated six types of non-plastic clays from Pocos de Caldas, MG, Brazil. These clays powders were characterized by chemical and granulometric analysis, X-ray diffraction, BET technique, picnometry and particle size distribution. The green and sintered density of samples was determined. This study indicated that clays presented refractory minerals such as kaolinite and gibbsite. Small amounts of quartz, illite and vermiculite were also observed. According to the results, the clays can be classified into two different types, related to their refractoriness.
收起
摘要 :
In this work we investigated six types of non-plastic clays from Po?os de Caldas, MG, Brazil. These clays powders were characterized by chemical and granulometric analysis, X-ray diffraction, BET technique, picnometry and particle...
展开
In this work we investigated six types of non-plastic clays from Po?os de Caldas, MG, Brazil. These clays powders were characterized by chemical and granulometric analysis, X-ray diffraction, BET technique, picnometry and particle size distribution. The green and sintered density of samples was determined. This study indicated that clays presented refractory minerals such as kaolinite and gibbsite. Small amounts of quartz, illite and vermiculite were also observed. According to the results, the clays can be classified into two different types, related to their refractoriness.
收起
摘要 :
The stability of lightweight structure such as pavement is majorly influenced by subgrade soil. Expansive soil has high strength but it becomes problematic in the presence of water; it expands and shrinks during wet and dry condit...
展开
The stability of lightweight structure such as pavement is majorly influenced by subgrade soil. Expansive soil has high strength but it becomes problematic in the presence of water; it expands and shrinks during wet and dry conditions, respectively, because of its mineralogical composition. To minimize the cost of stabilization and to improve the load bearing capacity of such soil, these are the major concerns for problematic high plastic expansive subgrades. In this study, the experiment has been carried out to examine the feasibility of waste materials bagasse ash and ground granulated blast furnace slag as a soil stabilizer to improve subgrade. Consistency limits, California bearing ratio, unconfined compressive strength, and swelling pressure were studied to check the effect on high plastic clay when treated with waste material. The experimental results showed the improvement in soaked California bearing ratio and reduction in the swell-shrink behavior of soil when combined with bagasse ash andground granulated blast furnace slag. Hence, these wastes can be used as a pozzolanic material to stabilize the high plastic expansive clay of the pavement subgrade.
收起
摘要 :
As the future highest dam in the world，Shuang Jiang Kou rockfill dam was the water retaining structure of homonymous hydropower station，a controlling engineering on Da Du River hydropower development，which is under design ...
展开
As the future highest dam in the world，Shuang Jiang Kou rockfill dam was the water retaining structure of homonymous hydropower station，a controlling engineering on Da Du River hydropower development，which is under design now.This dam is a central earth core dam with a height of 312 meters.A type of gravel soil stiffer than clay，which is made by artificial compounding of clay and gravel，is introduced to reduce the difference in displacement of earth core and rock filled shell zone.A three dimensional coupled nonlinear finite element analysis is carried out to study the three dimensional stressstrain behavior of Shuang Jiang Kou rockfill dam. Computation results show that the introduction of the contact high-plasticity clay layer is effective and necessary.
收起
摘要 :
As the future highest dam in the world，Shuang Jiang Kou rockfill dam was the water retaining structure of homonymous hydropower station，a controlling engineering on Da Du River hydropower development，which is under design now.T...
展开
As the future highest dam in the world，Shuang Jiang Kou rockfill dam was the water retaining structure of homonymous hydropower station，a controlling engineering on Da Du River hydropower development，which is under design now.This dam is a central earth core dam with a height of 312 meters.A type of gravel soil stiffer than clay，which is made by artificial compounding of clay and gravel，is introduced to reduce the difference in displacement of earth core and rock filled shell zone.A three dimensional coupled nonlinear finite element analysis is carried out to study the three dimensional stressstrain behavior of Shuang Jiang Kou rockfill dam. Computation results show that the introduction of the contact high-plasticity clay layer is effective and necessary.
收起
原文获取