环境对基坑开挖的影响

环境对基坑开挖的影响(中文3800字,英文3000字)
文摘:在三维有限元程序考虑耦合的地下水渗流和土骨架变形基础上提出了一种三维比奥固结理论和非线性模型的开挖过程。对比分析结果考虑不同的变化和水头不考虑孔隙水压力分布,与前者是完全不同的,并且在基坑变形的原理是比较那些后者,这样的结果,没有考虑到不同的变化，是不可靠的。土壤分布规律的水平和垂直位移,超孔隙水压力的情况等,详细分析了在空间形态和时间性质上,都具有十分重要的指导作用,确保地下工程建设周围环境的安全。
关键词:  环境效应   开挖    不变形  超孔隙水压力

Environmental effects induced by excavation
Abstract: Based on 3D Biot’s consolidation theory and nonlinear Duncan-Chang’s model, a 3D FEM (finite element method) program is developed considering the coupling of groundwater seepage and soil skeleton deformation during excavation. The comparison between the analysis result considering the variation of water head difference and that without considering it shows that the pore water pressure distribution of the former is distinctly different from that of the latter and that the foundation pit deformations of the former are larger than those of the latter, so that the result without considering the variation of water head difference is unreliable. The distribution rules of soil horizontal and vertical displacements around the pit and excess pore water pressure are analyzed in detail in time and space, which is very significant for guiding underground engineering construction and ensuring environment safety around the pit.
Key words: Environmental effect, Excavation, Deformation, Excess pore water pressure