交通移动荷载下倾斜地层土工加筋路堤变形机理及计算方法研究

随着新时代西部大开发进程加快，西部山区即将大规模修建公路、铁路等交通基础设施。山区倾斜地层上路堤的变形控制是高速公路建设过程中亟需解决的关键难题。土工加筋技术是一种经济、高效的地基变形控制手段，近年来其研究与应用呈快速增长趋势，但交通荷载下倾斜地层土工加筋路堤变形机理尚待探索。本项目拟通过室内试验、模型试验、数值模拟和理论分析等手段，针对交通移动荷载下倾斜地层土工加筋路堤的变形机理及计算方法开展研究。首先结合山区倾斜地层的特点，开展路堤填料参数演化规律和强度特性试验研究，建立复杂应力状态下山区倾斜路堤材料的本构模型；然后，开展倾斜地层土工加筋路堤模型试验，揭示非对称应力条件下加筋路堤荷载传递机理及协同工作机理；最后建立山区倾斜地层上土工加筋路堤荷载传递计算模型，提出考虑非对称应力场的加筋路堤计算方法。研究成果将为山区高速公路土工加筋路堤的设计计算提供理论支撑。

With the acceleration of the development of the western region in the new age, large-scale roads, railways and other transportation infrastructures will be built in the western mountainous areas. Deformation control of the embankments on inclined stratum in mountainous is a key problem to be solved in the process of expressway construction. Geotechnical reinforcement technology is an economical and efficient method for controlling foundation deformation. In recent years, its researches and applications have shown a rapid growth trend, but its deformation mechanism under traffic load in inclined strata remains to be explored. The project carried out the following researches through indoor test, model test, numerical simulation and theoretical analysis. It is planned to carry out researches on the deformation mechanism and calculation method of geotechnical reinforced embankment in inclined strata under the moving traffic loads. Firstly, combining with the characteristics of inclined stratum in mountainous areas, experimental research on the evolution of embankment filling parameters and strength characteristics is carried out, and constitutive models of inclined embankment filling materials in mountainous areas under complex stress conditions is established. Then, the model test of geotechnical reinforced embankment in inclined stratum is carried out, and it used to reveal the load transfer mechanism and cooperative working mechanism of reinforced embankment under asymmetric stress conditions. Finally, a calculation model for load transfer of geotechnical reinforced embankments on inclined stratum in mountainous areas is established, and a calculation method for the reinforced embankments considering the asymmetric stress field is proposed. The research results will provide theoretical support for the design and calculation of geotechnical reinforced embankments of expressways in mountainous areas.