超高土石混填路基填料力学特性及沉降研究OA
Research on the mechanical properties and settlement behavior of ultra-high soil-rock mixed fill subgrade materials
随着高速公路建设不断向贵州山区延伸,超高填方路基(填方高度超过50 m)的工程数量逐渐增加,贵州地区路基填方材料主要为灰岩和泥岩混合体.因此,研究块石强度对高围压条件下土石混合体剪切特性的影响规律具有重要的工程意义.文中基于室内单轴压缩试验与三轴压缩试验,对灰岩与泥岩混合料的细观参数进行了标定,并利用离散元程序建立数值模型,对不同岩石强度条件下高围压作用下的土石混合体进行数值模拟分析.通过对剪切变形特征、峰值剪切强度及裂纹扩展演化过程的研究,揭示了土石混合体在宏观力学响应与细观破坏机制之间的内在联系.在此基础上,基于三轴数值模拟结果,从路基填方高度、含石量以及块石强度等因素出发,系统分析了高填方路基的沉降变形规律,为贵州山区超高填方路基的设计与稳定性评价提供理论依据.
The continuous expansion of highway construction into mountainous regions of Guizhou Province has led to an increasing number of ultra-high embankments with fill heights exceeding 50 m.The fill materials in this region are predominantly soil-rock mixtures composed of limestone and mudstone.Therefore,investigating the influence of rock block strength on the shear characteristics of soil-rock mixtures under high confining pressure is of great engineering significance.In this study,mesoscopic parameters of limestone-mudstone mixtures were calibrated based on laboratory uniaxial and triaxial compression tests.A discrete element method(DEM)-based numerical model was then established to simulate the mechanical behavior of soil-rock mixtures subjected to high confining pressure under different rock strength conditions.The shear deformation characteristics,peak shear strength,and crack initiation and propagation processes were analyzed to reveal the relationship between macroscopic mechanical responses and mesoscopic failure mechanisms.Furthermore,based on the triaxial simulation results,the settlement characteristics of high embankments were systematically investigated considering the effects of embankment height,rock content,and block strength.The findings provide a theoretical foundation for the design and stability assessment of ultra-high embankments in mountainous regions of Guizhou Province.
袁鑫海;李超;刘新荣;钟祖良;王宏
贵州大学 土木工程学院,贵阳 550025贵州大学 土木工程学院,贵阳 550025||重庆大学 土木工程学院,重庆 400045重庆大学 土木工程学院,重庆 400045||库区环境地质灾害防治国家地方联合工程研究中心,重庆 400045重庆大学 土木工程学院,重庆 400045||库区环境地质灾害防治国家地方联合工程研究中心,重庆 400045贵州大学 土木工程学院,贵阳 550025
建筑与水利
高围压土石混合体块石强度离散元法微观结构变化高填方路基
high confining pressuresoil-rock mixturerock strengthdiscrete element methodmesostructural evolutionhigh-fill subgrade
《重庆大学学报》 2026 (9)
72-86,15
国家自然科学基金青年基金项目(5220839152508373)国家自然科学基金面上项目(52474092)贵州大学博士基金项目(2021-78). Supported by the National Natural Science Foundations for Young Scientists of China(5220839152508373),National Natural Science Foundations for General Program of China(52474092),and Doctoral Foundation Project of Guizhou University(2021-78).
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