延边地区公路沿线膨胀性软岩的发现与试验研究

RESEARCH ON THE EXPANSIVE SOFTROCK IN YANJI REGION

延边地区公路沿线滑坡调查中,发现了一种工程性质不良、易于导致滑坡地质灾害的膨胀性软岩,通过对其物质组成、水理、力学和物化性质的一系列试验研究(包括蠕变、直剪、三轴压缩、膨胀、崩解、X光衍射和电镜扫描试验等),认为该软岩属强膨胀性软岩,粘粒矿物成分主要为蒙脱石和伊、蒙混层矿物。通过研究它们的成因、分布和成灾机理,提出了治理措施。

The expansive softrock in Yanji region has not been recorded in the published papers. Recently, several landslides occurred there during building of high grade road. The unexpected failure of slopes aroused close attention in the local geoengineering field. A series of tests-including creep test, direct shear test, triaxial compression test, expansion test, disintegration test and XRD technique, show that expansive softrocks exist in Yanji region and belong to high expansive softrocks by the national standard. The clay there is composed mainly by montmorillonite and mixed-layer mineral I/S with middle mixed-layer ratio. Based on research on mechanisms of failure of the slopes, the improving methods are put forward. The research on the expansive softrocks is of great significance for the treatment of slope of expansive softrocks in Yanji region.