基于蠕变试验路堤工后沉降的数值模拟

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2mm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10m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4mm，并在40d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。

Numerical Simulation of Post - completion Settlement of Embankment Based on Creep Test

Research purposes:High-speed railway requires zero settlement for the post-completion settlement of embankment in order to maintain the regularity and stability of track.Red rock belongs to the filling of C type and is easy to disintegrate and soften.The purposes of the research are to test and verify the feasibility of red rock as filling for embankment of high-soeed railway after smashing. Research methods:First smash the filling of red rock to less than 2 mm and increase the compactedness of sample to 95 %,then make step-by-step single axle loading on the sample until the sample damages.The duration of loading for one step is about one month.At the same time,fit the reduced section of creep curve with K-K-H model based on the test result of creep curve by step-by-step loading,and predict the post-completion settlement of the embankment with 10 m high filling by adopting mumerical simulation according to the fitting result.Research results:It is known from the result of mumerical simulation,the post-completion settlement of embankment top os 4 mm for one year and embankment top is in stable status about 40 days.Research conclusions:The result shows red rock as filling can meet the reauirement of post-completion zero settlement for embankment after it is treated by construction technique.