Numerical simulation of drawdown and land deformation in pumping-recovery tests performed on a circular excavation

A mathematical model, which not only fully couples fluid flow and solid skeleton deformation in unsaturated porous elastic media but also considers deformable diaphragm walls, is formulated in axially symmetric cylindrical coordinates for drawdown and land deformation. Based on this model, pumping-recovery tests in various conditions are numerically simulated to reveal the effects of elastic modulus of soil E and initial saturated hydraulic conductivity K_(sat0) on hydraulic head and land deformation. The heterogeneity with respect to E and K_(sat0) is separately taken into account. Large elastic modulus of soil contributes to both dewatering process and deformation control. Either large or small initial saturated hydraulic conductivity may cause relatively high groundwater table, while the larger one leads to smaller displacements.     

品牌全球化战略带来的启示

随着经济全球化进程的加速以及国内市场竞争的加剧,实施品牌全球化战略成为企业赢得市场竞争优势的必由之路。一、什么是品牌全球化品牌全球化是以卓越的相同的产品提供给全球市场,其名称被消费者赋予很高的符号价值或价值评估。其产品是高质量的,有良好的声望和牢固的消费者忠