考虑筋-土-面板长期相互作用的土工合成材料加筋土挡墙筋材内力计算理论研究

Geosynthetic-reinforced soil (GRS) retaining walls are employed more and more extensively in hydraulic and transportation projects because of their good performance and attractive cost-effectiveness. However, existing methods for estimating reinforcement loads do not properly take into account the interactions among the different components of retaining walls, resulting in inaccurate reinforcement loads that impair the cost-effectiveness or safety of the structures. Considering this fact, the project team will carry out extensive data analysis, numerical simulation, field monitoring and theoretical analysis to reveal the short-term and long-term interactions among backfill soil, reinforcement, facing, and foundation soil in single-tier GRS retaining walls. Based on this knowledge, the team will then establish a new reinforcement load calculation method for GRS retaining walls. This study will mainly investigate the following scientific problems: the effects of facing stiffness, weight and inclining angle on reinforcement load, the long-term interactions among the components of GRS retaining walls and their influences on the long-term reinforcement load development, and the force-transfer model of reinforced soil retaining walls based on the theories of soil mechanics, elasto-plasticity and structural mechanics. The study will promote the application of GRS retaining walls and advance the reinforced soil technology, bringing significant theoretical and economical impacts.

土工合成材料加筋土挡墙结构因其经济性及可靠性在我国水利交通等领域的应用越来越广。然而，现有的加筋土挡墙筋材内力分析方法未合理考虑挡墙各组成部分之间的相互作用，所计算得到的内力或远大于实际内力而导致不必要的浪费，或低于实际内力而带来安全隐患。基于此，本项目将应用数据分析、数值模拟、现场监测及理论分析等研究手段，深入揭示坚硬地基上单级加筋土挡墙在静力作用下筋-土-面板-面板基底之间从施工到运行期的相互作用机理，并以其为基础建立新的土工合成材料加筋土挡墙的筋材内力计算理论。重点研究的内容包括：面板刚度、重量、基底约束及倾斜度对筋材内力的影响机理；加筋土挡墙各组成部分长期相互作用机理及其与筋材内力演化的关系；以及基于土力学、弹塑性力学和结构力学理论的加筋土挡墙传力模型等。本项目的研究结果将推动我国土工合成材料加筋土结构建设，同时为国际加筋土技术发展提供动力，具有重要的工程实际意义和较高的学术价值。

土工合成材料加筋土挡墙结构因其经济性及可靠性在我国水利交通等领域的应用越来越广。然而，现有的加筋土挡墙筋材内力分析方法未合理考虑挡墙各组成部分之间的相互作用，所计算得到的内力或远大于实际内力而导致不必要的浪费，或低于实际内力而带来安全隐患。基于此，本项目应用离心机试验、材料试验、数值模拟、现场监测及理论分析等研究手段，重点开展如下研究：面板刚度、重量、基底约束及倾斜度对筋材内力的影响机理；加筋土挡墙各组成部分长期相互作用机理及其与筋材内力演化的关系；以及基于土力学、弹塑性力学和结构力学理论的加筋土挡墙传力模型等。项目的重要研究成果包括：1）揭示了加筋土挡墙中筋材-填土-面板之间的相互作用机理及传力机制；2）提出了考虑填土非线性及剪胀性的加筋土挡墙筋材内力理论分析方法；3）提出了面板对筋材内力影响的半理论分析方法；4）提出了强度极限条件下考虑筋材长期刚度的加筋土挡墙内部稳定分析方法。本项目的研究结果将推动我国土工合成材料加筋土结构建设，同时为国际加筋土技术发展提供动力，具有重要的工程实际意义和较高的学术价值。