考虑大型地下构筑物作用的区域地面沉降模拟研究

New challenges have emerged in the research area of regional land subsidence as large-scale underground structures increase in size and quantity. There are still unresolved problems worldwide regarding regional land subsidence considering large-scale underground structures, especially the influencing mechanism of underground structures and the numerical simulation for such cases. Through different ways, such as field investigation, data analyses, physical model tests, and numerical simulation, this project intends to figure out the mechanism of underground structures influencing regional land subsidence, and to construct the composite grid finite element method for numerical simulation of fully coupled three-dimensional regional land subsidence considering large-scale underground structures. This numerical simulation method can not only overcome the difficulties of the previous methods in regional land subsidence simulation with large-scale underground structures, but also can deal with the interaction between underground structures and regional land subsidence. The constructed numerical model will first be examined and calibrated by the field data of the study area and the examined and calibrated numerical model will then be applied in the prediction of regional land subsidence in this area. The predicted results can provide scientific instructions for groundwater extraction and underground structure plans. The research of this project is novel, and the ideas and methods used in the project are new and creative. The outcomes of this project have great scientific meanings in the further development of mechanism and numerical simulation of regional land subsidence, and have great practical values in the prediction and prevention of regional land subsidence and in the reasonable plans of groundwater extraction and underground structures.

随着大型地下构筑物规模和数量的增加，区域地面沉降研究面临着新的挑战，特别是地下构筑物影响区域地面沉降的机理以及考虑地下构筑物作用的区域地面沉降数值模拟方法，目前国内外对这些问题都没有很好地解决。本项目将采用现场调查、资料分析、物理模型试验、数值模拟等方法，揭示地下构筑物影响地面沉降的机理，建立考虑大型地下构筑物作用的三维全耦合区域地面沉降模拟的组合网格有限单元法，该方法既能克服以往方法存在的困难，也能刻画地下构筑物与区域地面沉降的相互作用。利用研究区实际观测资料对所建立的数值模型进行识别和检验，并将经识别和检验的模型应用于区域地面沉降的预测预报，为地下水开采和地下构筑物规划提供科学依据。本项目研究内容新颖，研究方法独特，创新显著，其研究成果对区域地面沉降机理及其数值模拟的发展与完善具有重要的科学意义，对区域地面沉降防治、地下水合理开采和大型地下构筑物合理规划具有重要的实际应用价值。

随着大型地下构筑物规模和数量的增加，区域地面沉降研究面临着新的挑战，特别是地下构筑物影响区域地面沉降的机理以及考虑地下构筑物作用的区域地面沉降数值模拟方法，目前国内外对这些问题都没有很好地解决。本项目采用现场调查、资料分析、物理模型试验、数值模拟等方法，研究地下水位变化情况下土层的变形特征，研究地下构筑物对地面沉降的影响，研究考虑地下水渗流和土层变形完全耦合的地面沉降模拟方法。项目揭示了地下构筑物影响地面沉降的机理，建立了考虑大型地下构筑物作用的三维全耦合区域地面沉降模拟方法，该方法既能克服以往方法存在的困难，也能刻画地下构筑物与区域地面沉降的相互作用，研究成果对区域地面沉降机理及其数值模拟的发展与完善具有重要的科学意义，对区域地面沉降防治、地下水合理开采和大型地下构筑物合理规划具有重要的实际应用价值。