Analysis of Deformation Characteristics in External Corner Area of Deep Foundation Pit in Soft Soil Area of Yellow River
Taking the deep foundation pit of Qixiuchang Station of Chuanhuang Tunnel in Jinan City as an example,the data of surface settlement,deep horizontal displacement of ground connecting wall and supporting force were an-alyzed by monitoring to study the deformation characteristics of external corner area of deep foundation pit in soft soil area of Yellow River.The results show that the surface settlement deformation law of the standard section of the foundation pit is triangular with the maximum deformation occuring at a place of 7 m from the foundation pit.The surface settlement deformation law of the external corner area is in the shape of soup spoon with the maximum defor-mation occurring at a place of 5 m from the foundation pit;The offset in the external corner of the deep horizontal displacement of the connecting wall is larger than that in the standard section with the maximum offset is 36.10 mm.The overall change rule is"bow"type.The maximum offset point gradually decreases with the change of the excava-tion progress as well as the overall deformation;The overall stress variation of the first steel support shows a down-ward trend and is basically in a tension state,which is basically consistent with the corresponding horizontal dis-placement and deformation characteristics of the deep layer.The axial force variation of the other three steel supports shows a fluctuating upward trend.
soft soil area of Yellow Riverdeep foundation pitexternal cornermonitoring datadeformation char-acteristic
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