冻融循环下糯米浆对石灰土抗剪强度的影响

在季节性冻土地区修建道路工程时，不仅要对土壤进行力学改性还需要保护脆弱的生态环境。本文研究了冻融循环条件下，糯米浆对石灰土抗剪强度的影响。在石灰土(石灰质量浓度为10%)中加入不同质量浓度(0%、2%、4%、6%、8%)的糯米浆，研究不同冻融循环次数(0次、1次、3次、6次、10次)下糯米浆改良土的应力应变曲线特征以及抗剪强度、黏聚力和内摩擦角的变化特征。结果表明，在石灰土中加入糯米浆可以提高改良土的抗剪强度，但糯米浆浓度过高反而导致抗剪强度降低，糯米浆浓度为6%时改良土的抗剪强度较大。冻融循环会导致改良土的抗剪强度下降，糯米浆可以降低改良土在冻融循环下的强度损失。冻融循环作用下，改良土黏聚力和内摩擦角的变化趋势不同。该结果为糯米浆改性季节性冻土地区路基土提供了参考。

Effect of Glutinous Rice Slurry on Shear Strength of Lime Soil under Freeze-Thaw Cycle

The construction of road projects in seasonal frozen soil areas needs to protect the fragile ecological environment while mechanically modifying the soil. In this paper, the effect of glutinous rice slurry on the shear strength of lime soil under freeze-thaw cycles was studied. The characteristics of stress-strain curves, shear strength, cohesion and internal friction angle of modified soil with glutinous rice slurry under different freeze-thaw cycles (0 times, 1 times, 3 times, 6 times, 10 times) were studied by adding glutinous rice slurry with different mass concentration (0%, 2%, 4%, 6%, 8%) into lime soil (lime mass concentration was 10%). The results show that the shear strength of modified soil can be improved by adding glutinous rice slurry into lime soil, but excessive concentration of glutinous rice slurry results in reduced shear strength. When the concentration of glutinous rice slurry is 6%, the shear strength of modified soil is large. Freeze-thaw cycles lead to the decrease of shear strength of modified soil, glutinous rice slurry can reduce the strength loss of modified soil under freeze-thaw cycles. Under the action of freeze-thaw cycle, the change trends of cohesion and internal friction angle of modified soil are different. The test results provide reference for the modification of subgrade soil in seasonal frozen soil area by glutinous rice slurry.