论文部分内容阅读
查明各土层变形特征是建立区域地面沉降模型的关键,为此对研究区全部12个土层的变形特征进行全面论述,并对变形特征与5种地下水位变化模式的关系加以讨论.范围大、地质条件复杂、所经历的水位变化模式多种多样造成不同土层、不同地点的同一土层和不同阶段同一地点的同一土层都有不同的变形特征.现有模型难以描述复杂的黏弹塑性本构关系,为此对Merchant模型进行改造,在此基础上建立相应的三维变系数水流模型和垂向一维沉降模型,并讨论2个模型的耦合.模拟结果良好,显示所建立的模型确能反映长三角地区1.7×104km2区域上复杂的地面沉降过程,可用于预测预报和控制地面沉降方案的制订.
Determine the deformation characteristics of various soil layers is the key to establish the regional land subsidence model, in order to comprehensively discuss the deformation features of all 12 soil layers in the study area, and discuss the relationship between the deformation features and the five groundwater level variation patterns. Large and complex geological conditions, the water level changes experienced by different types of soil layers varied in different ways, the same soil layer at different locations and the same soil layer at different stages have different deformation characteristics. The existing model is difficult to describe the complex viscosity Plasticity and constitutive relationship, the Merchant model is modified, and corresponding three-dimensional variable coefficient water flow model and vertical one-dimensional settlement model are established, and the coupling of the two models is discussed. The simulation results are good, showing that the established The model can indeed reflect the complex land subsidence process in the region of 1.7 × 104 km2 in the Yangtze River Delta and can be used for forecasting and control of land subsidence.