风化砂质板岩水理特性研究

摘要

砂质板岩在怀通高速公路分布极为广泛。砂质板岩在水的作用下，极易发生崩解和软化，进而出现强度降低。针以怀通高速公路24标边坡全、强、中和弱风化砂质板岩为研究对象，进行了崩解特性、软化、无侧限压缩、剪切渗透性的系列试验，揭示了砂质板岩受的水理特性。研究表明：①砂质板岩具备强烈崩解特性。砂质板岩揭露遇水后，快速发生氧化反应，进而发生崩解。风化程度越高，崩解越强烈；②砂质板岩水理性能由弱到强排序为：全风化砂质板岩＜强风化砂质板岩＜中风化砂质板岩＜弱风化砂质板岩；③砂质板岩越干燥，崩解效应越明显，大旱后突降雨，会导致板岩的强烈崩解，很容易诱发潜在滑坡。%Sandy slate is distributed widely in Huai-Tong Expressway.Under the action of water, sandy slate tends to disintegration and softening,then appears strength reduction.For researching the fully,strong,moderately and weak weathered sandy slates in slopes belonging No.24 section of Huai-Tong Expressway,the disintegration character test,softening test,unconfined compression test and shear permeability test were carried out,which revealed the hydrological characteristics to sandy slates.Re-search shows that:①sandy slate with strong disintegration characteristics.Sandy slate exposed in water, oxidation reaction occurs rapidly,and then collapse.The higher degree weathered,the disintegrating is stronger;②the hydrological characteristics of sandy slate are ranked as:weak weathered