A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Behaviour of a Highway Embankment on Contaminated Ground
The behaviour of two 4 m high embankments constructed on soft alluvial strata on the same site are discussed in this paper. One was constructed on undisturbed ground the other on approximately 4 m thickness of contaminated land. Special techniques were required to facilitate safe construction of the contaminated land embankment. Overall behaviour of the two embankments was similar and the main influence of the contaminated fill layer was to provide additional stability and to dictate the construction process required. Predicted and measured primary compression values were similar. However, from the magnet extensometer data, it was seen that the laboratory tests significantly underestimate the normal compression stiffness of both materials by approximately 20%. Therefore the closeness of the predicted and measured primary compression values may have been fortuitous and due to presence of non compressible sand / gravel lenses in the overall alluvium stratum. Insitu consolidation rate was some five times that predicted by laboratory tests. Secondary compression rate recorded insitu was also significantly higher than that predicted by the laboratory testing. Excess pore pressures dissipated rapidly in the contaminated land embankment due to the size and spacing of the vertical drains. Construction control was subsequently achieved using the ratio of maximum lateral movement to maximum vertical settlement. The target value of the ratio was determined from a data base of other Irish soft ground embankments.
Behaviour of a Highway Embankment on Contaminated Ground
The behaviour of two 4 m high embankments constructed on soft alluvial strata on the same site are discussed in this paper. One was constructed on undisturbed ground the other on approximately 4 m thickness of contaminated land. Special techniques were required to facilitate safe construction of the contaminated land embankment. Overall behaviour of the two embankments was similar and the main influence of the contaminated fill layer was to provide additional stability and to dictate the construction process required. Predicted and measured primary compression values were similar. However, from the magnet extensometer data, it was seen that the laboratory tests significantly underestimate the normal compression stiffness of both materials by approximately 20%. Therefore the closeness of the predicted and measured primary compression values may have been fortuitous and due to presence of non compressible sand / gravel lenses in the overall alluvium stratum. Insitu consolidation rate was some five times that predicted by laboratory tests. Secondary compression rate recorded insitu was also significantly higher than that predicted by the laboratory testing. Excess pore pressures dissipated rapidly in the contaminated land embankment due to the size and spacing of the vertical drains. Construction control was subsequently achieved using the ratio of maximum lateral movement to maximum vertical settlement. The target value of the ratio was determined from a data base of other Irish soft ground embankments.
Behaviour of a Highway Embankment on Contaminated Ground
Long, Michael (author) / Callanan, Frank (author)
Geo-Denver 2000 ; 2000 ; Denver, Colorado, United States
2000-07-24
Conference paper
Electronic Resource
English
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