Abstract: Due to a series of subgrade problems caused by the change of dry and wet environment, in order to study the hydraulic properties of foam light soil subgrade, unconfined compressive strength tests were carried out on specimens with different water content and different silty clay content, and the variation laws of peak strength, residual strength and secant modulus E50 of foam light soil were analyzed. The results show that: (1) the peak strength, residual strength and secant modulus E50 of foam light soil decrease with the increase of silty clay content and soaking time; (2) The dynamic modulus shows a trend of first increasing and then decreasing with the increase of water content, and the higher the content of silty clay, the smaller the dynamic modulus; (3) In order to meet the requirements of the bearing capacity of foam light soil and have less brittleness, the content of silty clay should be 24%.

Key words: foam light soil, peak strength, residual strength, secant modulus(E₅₀), dynamic elastic modulus

摘要： 由于路基含水量变化会影响其承载力,所以对不同吸水率和不同粉质黏土掺量的试件进行了无侧限抗压强度试验,分析了泡沫轻质土的峰值强度、残余强度以及割线模量E₅₀的变化规律。结果表明:泡沫轻质土的峰值强度、残余强度及割线模量E₅₀均随粉质黏土掺量和浸水时长的增加而减小;动弹性模量随吸水率的增加呈现先增大后减小的趋势,粉质黏土掺量越高动弹性模量越小;为满足泡沫轻质土的承载力要求且脆性较小,粉质黏土掺量在24%为宜。

关键词: 泡沫轻质土, 峰值强度, 残余强度, 割线模量(E₅₀), 动弹性模量