基于离散单元法的粗粒料缩尺效应探究
Study on the relationship between particle size distribution and stress-strain of soil

粗粒料粒径较大，很难采用原型级配料开展相应的室内试验，有必要对原型土进行缩尺，并根据试验级配料试验结果推测原型土的力学参数。目前，对于粗粒土的缩尺效应依然缺乏足够的认识。针对土体的级配变化，通过连续级配方程、泰勒级配方程、Fuller理想级配方程人为设置5组不同的级配试样，利用数值模拟软件PFC开展直剪试验。分析级配变化对土体抗剪强度指标的影响规律，并提出新的级配评价指标，建立该指标与土体抗剪强度之间的拟合关系。研究结果表明：两者之间具有较好的曲线关系。
In this paper, according to the gradation change of soil, five grades of graded samples were set up by means of the continuous gradation equation, the Taylor equation and the Fuller formula. The numerical simulation software PFC was used to carry out the direct shear test. According to the results, the paper analyzes the influence of gradation change on soil shear strength index and puts forward a new evaluation index of gradation, and establishes the index and the fitting relationship between the soil shear strength, and makes a detailed analysis