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研究目的:为了保持轨道的平顺性和稳定性,高速铁路要求路堤的工后沉降为零沉降,而红层属于C类填料,易崩解、软化,此研究为了验证将红层粉碎后作为高速铁路路堤填料的可行性。研究方法:将红层填料经过粉碎(小于2 mm以下),同时将试样的密实度提高到95%,对试样采用逐级单轴加载,每一级加载为一个月左右,直到试样破坏;同时以逐级加载的压缩蠕变曲线试验结果为基础,对蠕变曲线的减速段采用K-K-H模型进行拟合,根据拟合的结果,采用数值模拟对填筑高度为10 m路堤的工后沉降进行了预测。研究结果:由数值模拟结果知,路堤顶部的一年工后沉降为4 mm,并在40 d左右达到稳定状态。研究结论:其结果论证了采用红层作为填料经过一定的施工工艺后能满足路堤工后零沉降的要求。
Research purposes: In order to maintain track smoothness and stability, high-speed railway requires post-construction settlement of embankment to zero settlement, while the red layer belongs to Class C filler, easy to collapse, soften, this study in order to verify the red layer after crushing as a high speed Feasibility of railway embankment packing. Research Methods: The red layer filler was crushed (less than 2 mm), while increasing the density of the sample to 95%, the sample using step by step uniaxial loading, loading each level for about a month until the sample At the same time, the KKH model was used to fit the deceleration section of the creep curve based on the test results of the compression creep curve loaded step-by-step. Based on the fitting results, numerical simulation was performed on the embankment with the height of 10 m Post-subsidence was predicted. Findings: According to the numerical simulation results, the settlement at the top of the embankment after one year is 4 mm and reaches a steady state at about 40 days. Research conclusions: The results demonstrate that the use of red layer as a filler after a certain construction process to meet the requirements of zero settlement after embankment.