【作者】 苟联盟；

【导师】 张勤； 陈志坚；

【作者基本信息】 河海大学 ， 地质工程， 2001， 硕士

【摘要】 土木建筑工程中上部结构理论较为成熟，建在软土地基上的建筑物的质量和安全事故主要因地基问题引发，而地基土的压缩，大型基础的变形变位及稳定性，均与土的固结有关。目前，工程数值计算中，对土固结的有限元分析大多停留在二维固结理论解法或三维固结理论的平面解法上。 本文从“真三维固结理论”即比奥固结理论出发，采用邓肯-张E～μ模型和无厚度的古德曼（Goodman）接触面单元编制了三维非线性有限元程序实用程序Biot2000，并结合润扬长江公路大桥南汊桥北锚碇及地基土的组成结构特征建立了概化地质模型。在三维有限元计算中，对不同工况（沉井充填、锚体浇筑、主缆架设、箱梁吊装、桥面铺装以及通车运营）下的施工过程作了模拟，全面揭示了各工况下锚碇沉井基础与地基土的变形变位规律，着重分析了影响散索鞍水平位移的因素以及不同工况下沉井前测地基土水平向抗力变化规律，并提出了不同深度地基土水平向抗力与水平位移间的拟合关系。用于指导工程实践，给建设单位提供参考。更多还原

【Abstract】 The theory of up-structure is better than others in civil engineering. Therefore, to the constructions which building soil foundation, the accidents of quality and safety induced by foundation problem. However, compression of foundation soil, displacement and stability of large foundation, are associated with the consolidation of soil. At present, soil consolidation analyzed by Finite Element Method in engineering numerical computation, is mostly limited on solution of two-dimension consolidation theory or plane solution of three-dimension consolidation theory.This thesis, based on the true three-dimension consolidation theory namely Biot’s Consolidation Theory, adopting Duncan-Chang model and non-thickness Goodman friction element, compiles practical 3D non-linear FEM program. The conceptual geological model is established according to the north anchorage and feature of its foundation soil in ZhenJiang-YangZhou Yangtse Bridge. During the 3D finite element calculation, try to simulate different procedure of the construction (like sunk well in-filling, main cable erection, box girder hoist, bridge flooring and opening to traffic). And then, reveal the regulation of deformation and displacement on the foundation and soil during different period. After got these, this thesis put great attention on the analysis of the reason which cause the horizontal displacement of the cable saddle, as well as the regulation of the pressure’s changing in the soil located on the front side of the sunk well foundation. Point out that the relative relation between the soil pressure in different depth and the horizontal displacement. These conclusions can be adopted hi practice and to be reference of the construction unit.更多还原