Research on Deformation Characteristics of Riverside Deep Foundation Pit in Alluvial Stratum of Yellow River
Base on the monitoring excavation data of a riverside deep foundation pit supported by underground con-tinuous walls and inner supports in the alluvial stratum of Yellow River,the changing law of the horizontal displace-ment of the wall,the vertical displacement at the top of the wall and the surface settlement behind the wall were studied.The applicability of estimating the deformation of foundation pits by the stable safety factors method for was verified in this region.The results show that the horizontal displacement of the wall exhibited a significant time-space effect.The maximum horizontal displacement increased logarithmically with the distance between the monitor-ing point and the pit's edge,and was linearly positively correlated with the excavation depth;Before pouring the bottom plate,the maximum horizontal displacement of the wall was 0.15％H(H is the depth of the pit)which was lo-cated at a depth of 92.3％H.There were vertical uplift at the top of the wall.Earth's gravity stress partially recovered after the pouring the plate.The vertical displacement at the top of the wall remained stable.The ground settlement was distributed in a"groove"shape,and the maximum settlement is 0.11％H.The maximum horizontal displacement estimated was 0.38％H by the stability safety factor method.The actual maximum settlement monitored was 73％of the maximum horizontal displacement,which was in line with the estimated results by the stable safety factors method.It can provide reference for the study of deformation characteristics of deep foundation pit in similar areas.
deep foundation pitYellow River alluvial formationunderground continuous wallhorizontal dis-placementvertical displacementsurface settlementdeformation estimation
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