Research Of Sedimentation Deformation Of Pile Foundation In Permafrost Area Considering Tangential Rheology

With more and more leap of human impacts and engineeringconstruction in Permafrost of Qingh ai-Tibetan plateau．Pilefoundation Plaved a very important part as foundation form inarchite CtUral engineering. The Stability of the pile found ationeffected the building superincumbent The effects of specia1natural geography condition and different peprmafrostengineering condition．made the long-term strength of pilefoundation become the function of temperature．i C e-content．loadand time.It would change because of the rising temperature．thehuman impacts．and the change of the hvdrothermal environmentThe pile foundation would slowness settlement for the rheologyof permafrost around it．which cause from long-term load It'Sunsafe t0 the stability of pile foundationThe cha racteristic and rule of the deformation had beingresearc ed．after many methods being put in Practice．in cludingfield reconn aissance and experiment．indoor experiment．andlongtime observation abovt the deformati on of pile foundationSimultaneity．referencing the existing research results and mathmodel of pile found ation．and considering the boundary conditionof perm afrost of Qinghai-Tibetan plateau．the settlementmechanism had being studved using the software FLAC3D. Andthe repair measure also had being gived for the settlement of pilefoundation:(1) 0n the results of field observation of pile foundationdeformati on in Qinghai-Tibe tan Plateau permafrost area,thecharacteristic of pile foundation deform ation had been pointedIn the observe time,the pile foundation whole showed subsided,the deformation showed slowing in cold seasons and speedup inwarm seasons,owned inte rmittence,season ality and periodicity(2) The reasons of the pile found ation deformation hadbeen studied by the means of engineering geologic boring,field and indoor experiments．observation of ground tenperatureBecause the thickness ofpermafrost a round th e Pil e foundationwas sma11er．the thermal stabilitY was worse．the Permafrostwasin a degenerati on conditi on and deve1oped rheology．all of thismad the Pile foundation taken Place of creep subsided(3) Considering the exist Pile foundation deformationmodel and Pile-soi1 coupling system math model．used the .software FLAC3D t0 d0 the numericl simulation of the creeP ofPile foundation under long-time load in Qingh ai-Tibetan PlateauThe simulation results fitted for the fact．Proved the conclusionthat the creep made the Pile foundation subsided(4)Based on the resear chre sults．many measures had beenadvanced,including thermal probes,rubble slope Protection,aterproof and drainage The target was to reduce the temperatureof the permafrost around the Pile foundation．reduce the erosionfrom the surface water and suprapermafros water．finally reducethe subsidence of the pile foundation(5)Design pile foundation in Qinghai-Tibetan plateaupermafrost area should consider the change of permafrostenvironment caused by rising temperature and thermal erosion．consider the rheology of the permafrost around the pilefoundation,take measure to control the creep speed and creepdeform ation...