复杂变形特征下的三维变系数区域地面沉降模型研究

Land subsidence caused by excessive ground water withdrawal has occurred in many regions in China, such as Shanghai City, Tianjing City, Jiangsu Province, Zhejiang Province, Shanxi Province, Hebei Province, Shandong Province etc., totally sixteen cities and provinces involved. In some of these regions, earth fissures has occurred. To improve the accuracy of land subsidence simulation and to simulate earth fissure, it is necessary to develop a regional land subsidence model considering three dimensional deformation of aquifers and aquitards.Observation data of horizontal deformation is available with wide application of monitoring techniques of GPS and InSAR etc, which will promote the development of three dimensional land subsidence model. Based on the former work of our group on land subsidence modeling, a three dimensional land subsidence model will be developed to simulate both horizontal and vertical deformations, to describe complex deformation characteristics like elastic, visco-elastic, elastic-plastic, and visco-elastic-plastic deformation, to have variable parameters of hydraulic conductivity and volume compressibility which change with land subsidence. MsFEM will be applied to solve regional three dimensional land subsidence model. Simulation of land subsidence in Su-Xi-Chang area will be a case study of the proposed three dimensional land subsidence and MsFEM. No similar study was reported.

过量开采地下水引起的地面沉降出现于上海、天津、江苏、浙江、陕西、河北、山东等16个省市，其中不少地区还存在地裂缝现象。为提高地面沉降模拟精度，为模拟地裂缝现象，有必要建立考虑土层三维变形的区域地面沉降模型。GPS，InSAR等监测技术应用的日趋成熟，使得水平变形数据不再成为建立三维沉降模型的制约条件。本课题将在前期工作基础上建立考虑水平和垂直方向变形，能刻画弹性、粘弹性、弹塑性、粘弹塑性等复杂变形特征，渗透系数、压缩系数等参数随地面沉降变化的三维地面沉降模型。将MsFEM应用于三维地面沉降模型求解。通过苏锡常地区地面沉降模拟对所建三维地面沉降模型和MsFEM方法的应用进行检验。国内外未见同类研究。

过量开采地下水引起的地面沉降出现于上海、天津、江苏、浙江、陕西、河北、山东等16 个省市，其中不少地区还存在地裂缝现象。为提高地面沉降模拟精度，为模拟地裂缝现象，有必要建立考虑土层三维变形的区域地面沉降模型。GPS，InSAR 等监测技术应用的日趋成熟，使得水平变形数据不再成为建立三维沉降模型的制约条件。本课题在前期工作基础上建立了考虑水平和垂直方向变形，能刻画弹性、弹塑性等复杂变形特征，渗透系数、压缩系数等参数随地面沉降变化的三维地面沉降模型。将MsFEM 应用于三维地面沉降模型中三维水流模型求解。通过苏锡常地区和上海地区地面沉降模拟对所建三维地面沉降模型和MsFEM 方法的应用进行了检验。国内外未见同类研究。