摘要
针对通平高速公路的红砂岩虽然可归类为III类岩但其仍具崩解性的特点,从成分、晶体形貌等微观角度研究了该路段红砂岩崩解特性。矿物成分分析结果表明该路段红砂岩所含粘土矿物为绿泥石,而非蒙脱石、高岭石、伊利石这3种常见粘土矿物。浸水膨胀试验表明该路段红砂岩虽然可崩解但是不具有膨胀性。对崩解前后的红砂岩成分、晶体形貌的粉晶XRD、透射电镜和电子衍射试验表明该路段红砂岩的崩解主要是非晶质的胶结物流失所致。研究解释了该路段红砂岩崩解特性的特殊性,深化了对红砂岩的认识。在此基础上,提出该路段红砂岩切方区可不换填的处治原则。
Although the red sandstone of Tongcheng-Pingjiang expressway can be classified as rock of class Ⅲ, the sandstone still has the property of disintegration. The disintegrating property of the red sandstone was researched from the micro-perspective aspect of composition and crystal morphology. The result of rock mineral composition analysis show that the main clay minerals contained in the red sandstone is chlorite but not the common minerals of Montmorillonite, kaolinite and illite. The result of soaking and expansion test shows that despite the red sandstone exhibiting some kinds of disintegrating properties, this kind of stone hardly expanding when disintegrating. Comparative analysis on chemical composition of the red sandstone and crystal morphology characteristics by powder XRD method, TEM and Electron diffraction method show that the main cause of disintegration of the red sandstone is amorphous mineral loosing rather than clay mineral expansion when absorbing water. The research explained the particularity of the disintegrating property of the red sandstone, and deepened the understanding of the red sandstone. Finally, the optimized treatment principle for cutting section of the red sandstone was put forward, that is, for Tongcheng-Pingjiang expressway, it is unnecessary to adopt the replacement method to cutting section.
出处
《公路交通科技》
CAS
CSCD
北大核心
2011年第10期7-11,共5页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(50808076)
湖南省科技推广重点项目(2007CK3065)
关键词
道路工程
红砂岩
崩解
绿泥石
微观结构
road engineering
red sandstone
disintegration
chlorite
micro-structure
