摘要
通过对红砂岩的试件(样)基本物理指标测试、浸水循环试验、偏光显微镜观察、扫描电镜、能谱分析,从岩石的基本物理指标、微观结构和化学成分元素以及它们的宏观物理裂隙特征入手,探讨红砂岩的崩解、软化机理。研究结果表明:红砂岩浸水后,水分子首先进入孔隙中,可溶盐矿物与水发生水解反应,随着易溶盐矿物的溶解,孔隙变大,进而失去黏结力,导致崩解、泥化。烘干后的红砂岩的崩解软化性比天然红砂岩的更为强烈;其崩解量随着干湿循环次数的增加而变化,次数越多,崩解性越为强烈,反之,越弱。同时,红砂岩的崩解性与其矿物成分、含水率以及温度等因素有关。
Herein the specimen of red sandstone was analyzed through the tests of basic physical indicators, cyclic water immersion, polarized light microscope, scanning electron microscope ( SEM ) and energy dispersive spectrometry ( EDS), and then starting from the rock's basic physical indicators, microstructure and chemical composition, together with the characteristics of macrophysical fissure, the disintegration and softening mechanism of red sandstone was discussed. The result shows that, when red sandstone is soaked in water, the water molecules firstly go into the pores and react with soluble salts, i. e. hydrolysis reaction, and with the dissolution of these soluble salts, the pores are enlarged and lose the bonding power, thus disintegration and argillization are caused. The dried red sandstone has stronger behavior of disintegrating and softening than the one in natural state, and the quantity of disintegration varies with the increment of dry-wet cycles, the more cycles, the stronger the disintegration, or the weaker on the contrary. Simultaneously, the disintegration property of red sandstone relates to its mineral composition, moisture content and temperature.
作者
林志红
王俊杰
LIN Zhihong;WANG Junijie(The 2nd Highway Consultants Co., Ltd., China Communications Construction Corporation, Wuhan 430056, China)
出处
《路基工程》
2019年第3期94-98,共5页
Subgrade Engineering
关键词
红砂岩
浸水
崩解
软化
微观结构
red sandstone
water immersion
disintegration
softening
microstructure
