Comparative study on foundation treatment for rich water sites in plateau permafrost regions
The engineering geological conditions in high-altitude permafrost regions are complex,and the differential frost heave and thaw settlement of permafrost foundations threaten the long-term stability and service performance of engineering structures.In order to meet the requirements of post construction(differential)settlement of foundation and reduce disturbance to underlying permafrost,a field test on foundation treatment is carried out at a water rich site in transition section of freeze-thaw zone.A comparative study is conducted on two construction schemes for foundation treatment,namely,"stone throwing and filling"and"stone throwing and filling + replacement".The results show that for four types of engineering geological conditions,including muddy mudstone,sandy soil,medium coarse sand,and transition section of freeze-thaw zones,direct use of"stone throwing and filling"has resulted in phenomena such as mud overturning and mud seepage,which makes it impossible to meet the requirements.However,the use of"stone throwing and filling + replacement"can achieve the compaction requirements after 8～10 passes of rolling.
plateau permafrost regionfoundation treatmentstone throwing and fillingstone replacing and filling
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