泥膜形成与状态划分细观分析及模型试验研究

发布时间：2019-04-16 11:27

【摘要】：泥水盾构施工中泥浆在高压作用下侵入土层形成不同状态的泥膜,泥膜的形成机理复杂,但其状态划分依据相对简单。基于离散元程序YADE编制了流体与颗粒相互作用及粒间长程引力作用模型,从粒径比、粒间范德华力、流体初始流速以及泥浆颗粒密度几个方面分析了泥浆侵入土层初始恒速阶段的堆积状态,确定土层最紧密堆积对应的泥膜状态理论下限值。采用静置后的泥浆侵入土层模型试验分析了两组土层粒径的泥膜状态,表明粒径比对泥膜状态的影响与离散元分析结果、泥膜状态划分理论相吻合。初步建立了泥膜形成过程的宏细观联系,弥补了传统过滤理论和离散元法未考虑颗粒侵入土层动态形成泥膜的不足。
[Abstract]:In mud-water shield construction, mud invades into soil layer under high pressure to form mud film in different states. The formation mechanism of mud film is complex, but the basis of its state division is relatively simple. Based on the discrete element program YADE, a model of fluid-particle interaction and long-range gravitational interaction between particles is developed, which is based on particle size ratio and van der Waals force between particles. The initial velocity of fluid and the density of mud particles were analyzed in the initial constant velocity stage of mud invasion, and the theoretical lower limit value of mud film state corresponding to the most compact accumulation of soil layer was determined. The clay film states of two groups of soil particles were analyzed by static mud invasion model test. The results show that the effect of particle size ratio on mud film state is consistent with the results of discrete element analysis and the classification theory of mud film state. The macro-meso-relation of mud membrane formation process is established preliminarily, which makes up for the deficiency of traditional filtration theory and discrete element method, which do not consider the dynamic formation of mud film in soil layer by particle invasion.
【作者单位】：南京林业大学土木工程学院;同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家自然科学基金项目(51308302) 教育部博士点基金资助项目(20133204120014) 江苏高校优势学科建设工程资助项目(2013) 住建部基金项目(2013-K3-16)
【分类号】：U455.43;U452.11

【参考文献】