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| Model test study on dredger fill foundation treatment by airbag pressurization combined with surcharge preloading |
| LI Xueyuan1，2，ZHOU Hang1，2，LIU Hanlong1，2，DING Xuanming1，2 |
| (1. College of Civil Engineering，Chongqing University，Chongqing 400045，China；2. Key Laboratory of New Technology for Construction of Cities in Mountain Area，Chongqing University，Chongqing 400045，China) |
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Abstract The dredger fill consolidation under airbag pressurization combined with surcharge preloading (APCWSP) is studied by model test. The lateral pressure of airbag could increase the soil consolidation degree apparently. The consolidation degree is 82.75% and 75.31% for the APCWSP test and surcharge test，respectively，for the same consolidation time of 180 hours. And the engineering properties of soil in APCWSP test are accordingly better. The additional stress caused by pressurization is evenly distributed along the vertical direction. Also，the increment of the soil and pore water pressure decreases as the soil consolidation degree increases. According to soil displacement analysis，the displacement caused by lateral pressure is limited. Foundation deformation is still dominated by settlement. Moreover，the deformation is uneven because of the different drainage distance and device deformation. The result of the model test provides a basis for the application of APCWSP method in practice.
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2020, Vol. 39 
