【摘要】 基于渗流理论,采用一维非稳定渗流模型,阐述了边界为变水头条件下的真空预压影响区地下水位变化的解析方法。利用加固区平均地下水零压线作为边界条件,推导了排水边界上降深随时间变化的一维非稳定渗流,得出影响区土体中地下水位的变化规律。通过算例,分析了影响区渗透系数以及预压区排水速率等因素对影响区地下水位的影响。结果表明,对于渗透性较低的软黏土而言,采用非稳定渗流分析是必要的,影响区渗透系数是区外地下水位变化的主要因素。预压区排水速率只影响区外渗流趋于稳定的时间,对渗流范围的影响较小。更多还原

【Abstract】 The analytical solution for groundwater level changes in affected zone of soft ground with vacuum preloading was investigated by using one-dimensional unsteady seepage flow model.Using average groundwater zero pressure line in reinforced zone as the boundary condintion,solution of one-dimensional unsteady seepage flow model was conducted when reducation of water pressure in drainage boundary was changing over time.An example of the calculation based on the analytical solution was given to analyze the influence of permeability coefficient in affected zone and drainage rate in reinforcement area on groundwater level in affected zone.The results show that it is necessary to use unsteady seepage flow model to analysis soft clay that permeability is low and the permeability of soil in affected zone was the main factor to influene groundwater level outside reinforcement area.Drainage flow rate in reinforcement area only influence the time from unsteady seepage flow to steady flow but had less impact on flow range.更多还原