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列车振动荷载引起的路基长期沉降问题一直是影响列车正常运营的重要因素。首先,采用GDS空心圆柱扭剪仪对新近沉积的南京细砂重塑样进行循环三轴试验研究。在该基础上,通过总结国内外学者研究的累积变形模型公式,并与试验数据进行对比,分析了已有多种公式应用于南京细砂动力累积变形的预测时的可行性,给出了相关预测公式的模型参数参考值。根据试验结果,考虑试验围压对土体累积变形的影响规律,对部分公式进行了初步修正,扩大了相关预测公式的使用范围。研究成果对长江中下游轨道交通路基的长期沉降预测具有一定的指导意义和参考价值。
The long-term subsidence caused by train vibration load has always been an important factor affecting the normal operation of trains. First, the GDS hollow cylindrical torsional shear instrument was used to carry out cyclic triaxial tests on the recently deposited Nanjing fine sand remodeling samples. On this basis, by summarizing the formula of cumulative deformation model studied by scholars at home and abroad, and comparing with the experimental data, the feasibility of applying a variety of formulas to predict the dynamic cumulative deformation of fine sand in Nanjing is analyzed, and the correlation Predictive model parameter reference. According to the test results, considering the law of influence of test confining pressure on the cumulative deformation of soil mass, the partial formulas were preliminarily amended and the scope of application of the correlation prediction formula was expanded. The research results have certain guiding significance and reference value for the long-term settlement prediction of the rail transit subgrade in the middle and lower reaches of the Yangtze River.