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以石灰粉煤灰稳定风化砂的抗剪强度指标为研究对象,石灰以2%、4%、6%、8%掺入风化砂中,粉煤灰则按石灰和粉煤灰之比分别为1:2、1:3、1:4掺入.调整直剪试验的垂直载荷,分别按I级、II级、III级进行加载.研究表明:二灰可以显著提高风化砂的抗剪强度.在相同的垂直荷重下,不同二灰比例稳定风化砂的粘聚力随着二灰掺量的增加而增大,内摩擦角则是先增大再减小;在相同的二灰比例、二灰掺量下,稳定风化砂的粘聚力会随着垂直荷重的增加显著增大,内摩擦角则随着垂直荷重的增大而减小,速度先慢后快;在相同的二灰比例下,随着垂直荷重的增加,抗剪强度显著增大,且垂直荷重小于100 kPa时,增长速度较小,当垂直荷重大于100 kPa时,增长速度明显加大.
Taking the shear strength index of limestone stabilized weathered sand as the research object, lime is mixed with 2%, 4%, 6%, 8% into the weathered sand. The ratio of lime to fly ash is 1: 2, 1: 3 and 1: 4.The vertical loads of the direct shear test were adjusted and loaded respectively according to class I, class II and class III.The results showed that the ash could significantly improve the shear strength of the weathered sand. Under the same vertical load, the cohesion of stable limestone with different lime-fly ash ratio increases with the increase of the ash content, while the internal friction angle firstly increases and then decreases. In the same ratio of lime-fly ash, Under ash content, the cohesion of stable weathered sand will increase significantly with the increase of vertical load, while the internal friction angle will decrease with the increase of vertical load, , With the increase of vertical load, the shear strength increases significantly. When the vertical load is less than 100 kPa, the growth rate is smaller. When the vertical load is greater than 100 kPa, the growth rate increases obviously.