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Abstract The deformation of mudstone foundation under the second line of Lanzhou to Xinjiang Railway was studied with in-situ tests. Overloadings of six levels such as 9.75，21.44，38.99，58.48，65.31 and 77.99 kPa were applied to three pits and the corresponding expansions with the water soaking depths of 0.7，1.1 and 1.5 m respectively were measured. The process of mudstone expansion due to water soaking was found to have four stages：brief softening and subsidence，surging expansion，slow expansion and stable expansion. A nonlinear relationships between the water socking depths and soil expansion was obtained. When the water soaking depth was 1.5 m and the over load was 9.75 kPa，the largest soil expansion value was 41 mm. The maximum moisture content of mudstone was about 14% and would not increase with water recharging. When the moisture content of mudstone was increased around a range of values，with a bit of a lag，the expansion deformation of mudstone foundation was showed by inner accumulated energy. The relationship between the over load and expansion deformation was obtained. The deformation was mainly plastic and the rebounding value due to unloading was 6.39%–7.00% of the total deformation.
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2015, Vol. 34 
