CAJ | 학술논문

桩－软岩复合地基承受上部载荷时，时效变形预测依赖于对其流变机理的认识以及对流变模型的合理描述，为分析其流变机理，通过桩－软岩复合地基缩尺模型载荷试验，研究了桩身应力、桩底压力、承台下软岩压力以及软岩深部变形时效特征，对桩－软岩复合地基流变机理进行了系列试验研究。桩底压力以及桩间软岩变形时效特征明显，桩－软岩复合地基在工程荷载作用下的衰减蠕变可采用5参量广义开尔文模型进行描述，其流变参数为 EH ＝1．1 GPa，E1＝7．05 GPa，η1＝929 GPa·h，E2＝9．03 GPa，η2＝28 GPa·h，与软岩地基比较，桩－软岩复合地基流变参数明显提高。
장－연암복합지기승수상부재하시，시효변형예측의뢰우대기류변궤리적인식이급대류변모형적합리묘술，위분석기류변궤리，통과장－연암복합지기축척모형재하시험，연구료장신응력、장저압력、승태하연암압력이급연암심부변형시효특정，대장－연암복합지기류변궤리진행료계렬시험연구。장저압력이급장간연암변형시효특정명현，장－연암복합지기재공정하재작용하적쇠감연변가채용5삼량엄의개이문모형진행묘술，기류변삼수위 EH ＝1．1 GPa，E1＝7．05 GPa，η1＝929 GPa·h，E2＝9．03 GPa，η2＝28 GPa·h，여연암지기비교，장－연암복합지기류변삼수명현제고。
Prediction of the aging deformation of pile-soft rock composite foundation depends on the understanding of rheological mechanism and the description of the rheological model.The rheological mechanism of pile-soft rock composite foundation was researched by analyzing the aging characteristics of pile stress,tip resistance of piles, pressure in rock surface under pile cap,and deformation in the deep of soft rock through scale model loading creep test.Results indicated that the tip resistance of piles and the deformation of soft rock between piles are both with obvious aging characteristics.The decay creep of the composite foundation under engineering loads can be accurate-ly described by generalized Kelvin model with five parameters.The values of the five model parameters are as fol-lows:EH =1 .1 GPa,E1 =7.05GPa,η1 =929 GPa·h,E2 =9.03 GPa,η2 =28 GPa·h.The rheological param-eters of the composite foundation are significantly higher than those of soft rock foundation.