DOI: 10.3724/SP.J.1249.2018.02111

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:2 PP.111-118

The temperature and pore water pressure in soil subjected to dynamic load

The pore scale and pore water pressure in soil change with the compression of dynamic load. The changes of the temperature and the pore water pressure in soil were studied with and without the dynamic load. The results indicate that the isotherms at the upper part of the soil (0~10 cm) and at the bottom part (20~40 cm) are intensively dense and temperature gradients are large, but isotherms are sparse and temperature gradients are small at the scope of 10~20 cm, when the temperature reaches the maximum value; the isotherms in soil distribute uniformly when the temperature reaches the minimum value. The pore water pressure increases with the increasing numbers of freezing-thawing cycles under the conditions of no load and the dynamic load. In the early freezing-thawing, the values of pore water pressures in soil is positive in the range of 0-5 cm below the vibration plate, and they are negative in other regions. With the increasing numbers of freezing-thawing cycles, the region of the positive pore water pressure under the vibration plate extends to the depth of 10 cm, and the high pore water pressure area appears at the depth of 20 cm under the vibration plate.

Key words:geotechnical engineering,freeze-thaw cycle,dynamic load,soil temperature,moisture migration,pore water pressure

ReleaseDate:2018-03-20 15:26:56

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