三轴试验下路基砂土力学特征影响研究

Research on the Influence of Mechanical Characteristics of Subgrade Sand Soil under Triaxial Test

为研究公路路基改良砂土承载力学特性,文章通过设计三轴力学试验,分析了含水率、注浆压力及冻结温度三因素对改良砂土试样应力应变的影响。试验表明,注浆压力不影响试样应变特征,注浆压力越大,试样承载能力越强。低温冻结作用下,试样承载应力受冻结温度的影响具有门槛值,当温度高于-20℃时,冻结作用有助于促进试样承载应力,而温度过低,超过-20℃,则会对试样产生损伤效应。(是否是低于)

In order to study the bearing mechanical characteristics of improved sand soil in highway subgrade,a triaxial mechanical test was designed to analyze the influence of water content,grouting pressure and freezing temperature on the stress and strain of improved sand soil samples.The test shows that the grouting pressure does not affect the strain characteristics of the sample.The higher the grouting pressure is,the stronger the bearing capacity of the sample is.Under the action of low-temperature freezing,the bearing stress of the sample has a threshold value under the influence of freezing temperature.When the temperature is higher than -20℃,the freezing effect helps to promote the bearing stress of the sample,while if the temperature is too low and lower than -20℃,it will cause damage effect on the sample.