公路软土地基路堤失稳评估研究

Study on Stability Evaluation of Embankment on Soft Soil Foundation of Highway

摘要: 公路软土地基路基整体稳定性和地面沉降影响公路的安全运营。按照信息化施工及动态设计原则，某高速公路软土地基路段在施工过程中，经过了多次补充勘察及动态设计，最终对该路段地基采用了粉喷桩、管桩、反压等工程措施对该段软土路基进行了处理。为了解该路段路基沉降坍塌原因以及经处治后的软基路段稳定性，对该段路基沉降坍塌进行原因分析及处治后路基现状稳定性评估技术服务。采用Midas GTS NX有限元软件分别建立有限元模型，对典型断面的变形过程进行二维数值模拟，计算分析不同状态和工况下的边坡稳定性状况，计算稳定性系数，评价该路堤边坡稳定性，并基于有限元法进行路面沉降计算。可以为公路软土路基失稳处治后路基变形及稳定性评估提供理论支撑，并可作为相似评估项目的参考。

Abstract: The overall stability and ground settlement of highway soft soil subgrade affect the safe operation of the highway. According to the principles of information construction and dynamic design, a section of a certain expressway with soft soil foundation underwent multiple supplementary surveys and dynamic designs during the construction process. Finally, engineering measures such as powder jet grouting piles, pipe piles, and back pressure were adopted to treat the soft soil subgrade of the section. To understand the reasons for the settlement and collapse of the roadbed in this section and the stability of the treated soft foundation section, a technical service was provided to analyze the reasons for the settlement and collapse of the roadbed in this section and evaluate the current stability of the roadbed after treatment. Using the Midas GTS NX finite element software, finite element models were established to simulate the deformation process of typical cross-sections in two dimensions. Slope stability conditions under different states and working conditions were calculated and analyzed, and stability coefficients were calculated to evaluate the stability of the embankment slope. The pavement settlement calculation was conducted based on the finite element method. It can provide theoretical support for the evaluation of roadbed deformation and stability after treating the instability of highway soft soil roadbed, and can serve as a reference for similar evaluation projects.