Abstract: Slope destabilization and land slip usually happened while building the speedway in red sandstone area. On the base of the research findings about properties of the red sandstone and slope stability，the result of the indoor test on physical- mechanical property of clayer thin interlayer in red sandstone was mainly introduced. The variational rule of the shear strength by changing the water ratio of the thin interlayer was researched. The influencing on stability of slope with physicalmechanical property of the clayer thin interlayer in red sandstone were analysed. The research results indicate that the effect of the Water Sensitivity of the clayer thin interlayer is strong，and the clayer thin interlay does adverse effect on stability of slope.

Key words: thin interlayer, shearing strength, red sandstone, slope stability

摘要： 在红砂岩的特性与边坡稳定的研究成果基础上，重点介绍了红砂岩泥化夹层的物理力学性质的室内试验结 果，研究了泥化夹层的含水量对其抗剪强度的变化规律，并分析了红砂岩泥化夹层物理力学特性对边坡稳定性的 影响。研究结果表明:泥化夹层的水敏性强，对边坡的整体稳定性产生了较不利的影响。

关键词: 泥化夹层, 抗剪强度, 红砂岩, 边坡稳定