以三峡库区风化砂为研究对象,掺入不同剂量的石灰和粉煤灰进行改良,然后进行无侧限抗压强度试验,研究二灰稳定风化砂的路用性能。通过研究不同石灰剂量、二灰比及不同龄期下二灰稳定风化砂的无侧限抗压强度,并采用极差分析和多因素方差分析的方法,以二灰稳定风化砂的无侧限抗压强度为考核指标,对石灰剂量和二灰比这2个影响二灰稳定风化砂无侧限抗压强度的主要因素进行了分析,为二灰稳定风化砂作为基层或底基层的配比设计及施工提供依据。试验结果表明:二灰稳定风化砂能用作高速公路及一级公路的底基层或二级及二级以下公路的基层;在某一确定石灰剂量和同一二灰比下,二灰稳定风化砂的无侧限抗压强度随龄期的增长而增大,但随龄期增大的速度差异较大。石灰剂量是影响其强度的首要因素,二灰比是次要因素,但两者对风化砂的强度影响显著,并得到了该二灰稳定风化砂的最佳配比。
Abstract
The unconfined compressive strength and road-use performance of lime-flyash stabilized weathered sand were researched through unconfined compressive strength test. Different dosages of lime and flyash were added into the weathered sand of the three gorges reservoir, and lime content, lime-flyash ratio, as well as age varied during the test. The aim of this research is to provide basis for the proportioning of lime-flyash stabilized weathered sand used as base or subbase. Furthermore, range analysis and multi-factor variance analysis were conducted to analyse the influence of lime dosage and lime-flyash ratio on the unconfined compressive strength. Results show that weathered sand stabilized by lime and flyash can be used as the subbase of highway and primary highway, or the base of secondary and under-secondary highway. At a certain dosage of lime and the same lime-flyash ratio, the unconfined compressive strength increases with the increase of age, but this increment speed differs greatly. Lime is the primary factor which affects the strength, and lime-flyash ratio is the secondary factors. Moreover, the optimal proportion of lime-flyash stabilized weathered sand was obtained.
关键词
风化砂 /
二灰比 /
无侧限抗压强度 /
龄期 /
极差分析 /
多因素方差分析 /
最佳配比
Key words
weathered sand /
lime-flyash /
unconfined compressive strength /
age /
range analysis /
variance analysis multiple factors /
optimum proportion
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基金
湖北省教育厅自然科学研究重点项目(D20131304)
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