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由于深基坑周围环境的多样性,土体及支护结构的变形规律变得复杂。在土的弹塑性模型基础上,考虑时间的影响,引入滞后塑性变形的概念,将非弹性应变分解为瞬时塑性应变和滞后塑性应变,发展一个描述软土蠕变特性的弹黏塑性模型,通过FLAC~(3D)平台,进行二次开发。对某地铁车站深基坑施工进行了三维数值模拟,通过各工况下土体的变形矢量及墙体测斜值的分析,并与相同条件下无超载时作比较,探索邻近建筑物超载作用下深基坑施工土体的变形规律。
Due to the diversity of surrounding environment of deep foundation pit, the deformation rules of soil and supporting structures become complicated. Based on the elasto-plastic model of soil, considering the influence of time, the concept of hysteretic plastic deformation is introduced to decompose the inelastic strain into instantaneous plastic strain and hysteresis plastic strain. An elastic-viscoplastic model describing the creep property of soft soil is developed. FLAC ~ (3D) platform for secondary development. Three-dimensional numerical simulation of the deep foundation pit construction of a metro station is carried out. Through the analysis of the deformation vector of the soil and the measured slope value of the wall under each condition, and compared with the case without overloading under the same conditions, the overloading effect of the adjacent buildings is explored Deformation of soil under deep foundation pit construction.