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Abstract The in-situ soaking tests on loess collapsibility upon deadweight with the thickness greater than 36.6 m were carried out including a deep layer soaking test on a foundation treated with compaction piles of different lengths，a soaking test on a foundation treated with the deep dynamic compaction inside holes and a soaking test on a foundation buried with TDR moisture meters without water injection holes. The significant foundation subsidence occurred due to deep soaking when the thick deadweight collapsible loess foundation was treated 6 to 12 m in depths upon. When the depths of treatment were from 15 to 20 m，the ground settlement upon deep soaking was small. When the treatment depth was more than 20 m，the settlements of the foundation can be ignored. When the water pit of soaking test was 22.5 to 25.0 m in depth，the soil moisture content increased rapidly and even reached saturation，while if the water pit was deeper，the moisture content increased slowly with little collapse of loess. So 22.5 to 25 m can be viewed as the critical depth of foundation treatment and collapsibility evaluation for thick deadweight collapsible loess. The collapsibility in different regions and soil microstructures should be evaluated adopting different coefficients of collapsibility.
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Received: 03 August 2013
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2014, Vol. 33 
