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通过在传统西原本构模型中串联Newton体,可准确追踪黄河厚冲积黏土地层中土体卸荷后的非稳定蠕变力学行为特征。以济南省文化艺术中心大厦深基坑为工程背景,采用现场监测数据分析、统计建模和FLAC3D二次开发数值模拟相结合的方法进行模型优化和改进西原方程的参数辨识,分析了围护桩的不同插入比、桩边尺寸及桩间净距3种情况下基坑卸荷导致的底板上移规律,以及立柱桩入土深度、插桩位置及桩型对基坑开挖过程中立柱桩的回弹特性的影响。结果表明:底板上移对参数的敏感程度大小为围护桩净距>插入比>桩边长;立柱桩回弹对参数的敏感程度大小为立柱桩入土深度>插桩位置>桩型。利用此规律可有效降低基坑开挖对工程桩及底板隆起的影响,确保了济南省文化艺术中心大厦深基坑的施工安全、优质,为同类地层深基坑控制立柱桩及底板隆起提供了设计经验和参考。
By traversing the Newton body in the traditional West original constitutive model, the unsteady creep mechanical behavior characteristics after unloading in the thick alluvial clay stratum of the Yellow River can be accurately traced. Taking the deep foundation pit of Jinan Cultural and Art Center Building as the engineering background, the model optimization and the parameter identification of the Nishihara equation were carried out by combining on-site monitoring data analysis, statistical modeling and FLAC3D secondary development numerical simulation. Different insertion ratio, the size of the pile and the clearance between the piles under the three kinds of circumstances caused by the unloading of the floor and the law of the floor uplift, the depth of the pile into the soil, pile position and pile excavation process of piles Impact of rebound characteristics. The results show that: the sensitivity of the floor up to the parameters of the size of the fence spacing of> insertion ratio> length of the pile side; column pile rebound sensitivity of the parameters for the column pile into the soil depth> pile position> pile type. The use of this rule can effectively reduce the impact of foundation pit excavation on the project pile and floor bulge to ensure the safety and quality construction of deep foundation pit of Jinan Arts and Culture Center Building and provide the foundation pit elevation and floor bulge for deep foundation pit of similar strata. Design experience and reference.