【作者】 冯兆祥；

【导师】 卓家寿；

【作者基本信息】 河海大学 ， 水工结构工程， 2002， 博士

【摘要】 为了掌握大型桥梁地基基础在施工期与运营期的稳定性，本文研究了稳定性分析的主要数值方法和监测手段。重点对非线性有限元的求解、最不利滑动面的迁移、监测系统的设计等方面进行了理论研究，并且将理论研究的成果应用于江阴长江公路大桥南岸山体及地基基础的稳定性分析与监测。本文主要在以下几个方面开展研究工作： 1、在大型桥梁地基基础的稳定性分析方面，对非线性有限元求解方法—变K_p法进行了研究，在保持原有方法优点的同时，提出了一种改进方法，可以提高该方法的求解精度与适用范围；在指出最不利滑动面会在荷载、结构边界、水文地质条件等发生变化时发生迁移现象的基础上，提出了基于最不利滑移面迁移的稳定性动态分析方法。 2、在江阴长江公路大桥地基基础稳定性分析方面，建立了合理的概化地质模型与三维非线性有限元分析模型，分析了地基基础的稳定性。同时根据稳定性动态分析的思路，优化了桩基的作力点位置。 3、在大型桥梁地基基础安全监测系统设计理论方面，分析了安全监测系统设计的基本原则，提出了利用突破口理论与敏感性分析进行监测系统优化设计的方法，完善了大型桥梁地基基础监测系统优化设计理论。 4、应用上述所研究的理论和方法，针对江阴长江公路大桥南岸地基基础稳定性监测问题，优化设计了地基基础稳定性监测系统，并且对监测成果进行了分析，给出南岸山体及地基基础稳定性综合评价。更多还原

【Abstract】 To know the stability of the bridge foundation in the course of construction and running, this paper sums up the numerical methods and monitoring artifices with which to analyze the stability of foundation. The solving of nonlinear FE, the searching of sloping surface and the designing of monitoring system are researched in detail, and the fruits of theory research are applied to analyze and monitor the stability of the foundation of JiangYin Bridge. In a word, the works of this paper is as follows:1, About the stability analysis of bridge foundation, the Variational Kp method is researched. At the same time, an improved method that not only keeps the merits of the former method, but also improves the precision and extends the range is putted forward. At the basis of pointing out the phenomena of sloping surface moving when the loading, structural boundary or hydrology and geology conditions changes, the dynamic stability analysis to considering the moving of sloping surface is putted forwarded.2, About the stability analysis of JiangYin Bridge foundation, the geological model and nonlinear FE model are established, and the stability of foundation is analyzed. At the same time, according as the dynamic stability analysis, the position of pickets is optimized.3, Concerning the design theory of the monitoring system of bridge foundation, the basic designing principles to design monitoring system are analyzed, and the idea to optimize the monitoring system with Breach Viewpoint and Sensitivity Analysis is put forwarded.4, Aiming at the stability monitoring problem in the rock foundation of JiangYin Bridge ,the stability monitoring system of foundation is designed and optimized with the above principles and method researched in this paper, the monitoring results are analyzed, and the appraise about stability is gained.更多还原