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Rapid Drawdown of Water Table in Layered Soil Column
Tests of rapid drawdown of water table were performed in two one-meter-high soil columns of finer- over coarser-grained soils. The columns were instrumented with tensiometers for pore-water pressure measurements. The test was started from a saturated, hydrostatic condition and after drawdown the final water table was stabilized at the bottom. The test results show that a segregation of pore pressures across the finer-coarser soil interface began immediately after the drawdown was started. An isolated zone with positive pore pressures formed in the finer layer and the pore pressures dissipated in a relatively slow rate. At the same time, a new water table formed in the coarser layer and dropped to the bottom rapidly. The entire column reached a new hydrostatic condition after several days. The observed behavior was due to the sharp contrast in soil hydraulic properties across the soil interface.
Rapid Drawdown of Water Table in Layered Soil Column
Tests of rapid drawdown of water table were performed in two one-meter-high soil columns of finer- over coarser-grained soils. The columns were instrumented with tensiometers for pore-water pressure measurements. The test was started from a saturated, hydrostatic condition and after drawdown the final water table was stabilized at the bottom. The test results show that a segregation of pore pressures across the finer-coarser soil interface began immediately after the drawdown was started. An isolated zone with positive pore pressures formed in the finer layer and the pore pressures dissipated in a relatively slow rate. At the same time, a new water table formed in the coarser layer and dropped to the bottom rapidly. The entire column reached a new hydrostatic condition after several days. The observed behavior was due to the sharp contrast in soil hydraulic properties across the soil interface.
Rapid Drawdown of Water Table in Layered Soil Column
Yang, Hong (author) / Rahardjo, Harianto (author) / Xiao, Daping (author)
GeoShanghai International Conference 2010 ; 2010 ; Shanghai, China
2010-05-14
Conference paper
Electronic Resource
English
Rapid Drawdown of Water Table in Layered Soil Column
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