Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Highway Embankment Constructed on Soft Soil Improved by Stone Columns with Geosynthetic Materials
Great areas all over the world, particularly along the rivers and the seas, are covered with soft clay. Construction on soft natural soil is considered a risk due to its low shear strength and high compressibility. Stone columns are an effective improvement method for soft soils under light structures such as rail or road embankments. The stone columns derive their load carrying capacity from the passive earth pressure resistance developed against the bulging of the column which thereby depending on the shear strength of the surrounding soil. To avoid dispersion of the stones into the clay and to improve the stone columns as reinforcing elements, geosynthetics are used as an encasement of the stone columns. Increasing lateral and vertical deformations over the consolidation time controls the serviceability state and affects the economy of the embankments. Therefore, additional efforts to predict the long-term behavior of the reinforced soft soil with ordinary and encased stone columns foundation are required. In this research full scale stone columns in Bremerhaven clay, are analyzed using the finite element program Plaxis. Firstly, the stone columns are only loaded to investigate the effect of varying parameters like spacing distance between columns, column diameter, geogrid encasement and stiffness of the geogrid, and encasement depth on the behavior of the stone column in short and long term conditions. The results showed that the ordinary stone columns with narrower spacing distances and smaller diameters have a greater bearing capacity and show smaller settlement as well as lateral bulging than wider spacings and greater diameters of stone columns. When using geogrids as encasement for stone columns, a huge increase in the bearing capacity of the stone column as well as a huge reduction in the bulging occurs. More improvement occurs in the behavior of the encased stone columns with increasing encasement stiffness in both short and long term conditions. The bearing capacity of the partially encased stone ...
Highway Embankment Constructed on Soft Soil Improved by Stone Columns with Geosynthetic Materials
Great areas all over the world, particularly along the rivers and the seas, are covered with soft clay. Construction on soft natural soil is considered a risk due to its low shear strength and high compressibility. Stone columns are an effective improvement method for soft soils under light structures such as rail or road embankments. The stone columns derive their load carrying capacity from the passive earth pressure resistance developed against the bulging of the column which thereby depending on the shear strength of the surrounding soil. To avoid dispersion of the stones into the clay and to improve the stone columns as reinforcing elements, geosynthetics are used as an encasement of the stone columns. Increasing lateral and vertical deformations over the consolidation time controls the serviceability state and affects the economy of the embankments. Therefore, additional efforts to predict the long-term behavior of the reinforced soft soil with ordinary and encased stone columns foundation are required. In this research full scale stone columns in Bremerhaven clay, are analyzed using the finite element program Plaxis. Firstly, the stone columns are only loaded to investigate the effect of varying parameters like spacing distance between columns, column diameter, geogrid encasement and stiffness of the geogrid, and encasement depth on the behavior of the stone column in short and long term conditions. The results showed that the ordinary stone columns with narrower spacing distances and smaller diameters have a greater bearing capacity and show smaller settlement as well as lateral bulging than wider spacings and greater diameters of stone columns. When using geogrids as encasement for stone columns, a huge increase in the bearing capacity of the stone column as well as a huge reduction in the bulging occurs. More improvement occurs in the behavior of the encased stone columns with increasing encasement stiffness in both short and long term conditions. The bearing capacity of the partially encased stone ...
Highway Embankment Constructed on Soft Soil Improved by Stone Columns with Geosynthetic Materials
Elsawy, Mohamed (Autor:in) / Richwien, Werner
12.10.2010
Hochschulschrift
Elektronische Ressource
Englisch
Highway embankment constructed on soft soil improved by stone columns with geosynthetic materials
| UB Braunschweig | 2010
Failure mechanism of geosynthetic-encased stone columns in soft soils under embankment
| Online Contents | 2015