N_(2)红黏土水稳性机理试验研究  

Test Study on Mechanism of Water Stability of N_(2) Laterite

作　　者：孙元春 辛民高 蔡云廷 SUN Yuanchun;XIN Mingao;CAI Yunting(China Railway Design Corporation,Tianjin 300251,China)

机构地区：[1]中国铁路设计集团有限公司,天津300251

出　　处：《路基工程》2021年第4期69-72,共4页Subgrade Engineering

基　　金：中国铁路设计集团有限公司科技发展计划重点项目:北方上第三系地层工程地质特性及对策研究(721416)。

摘　　要：以某铁路隧道穿越N_(2)红黏土地层为依托,分析N_(2)红黏土的基本物理特征;通过压缩变形、剪切强度等试验手段,研究其水稳性特征,揭示浸水前后变形、强度特性的变化规律;采用粒度分析、X-RAY衍射分析、扫描电镜等方法,对其遇水变异机理进行了分析。结果表明:水是导致N_(2)红黏土物理力学性质发生变化的最主要因素,其水稳机理主要体现为物理弱化和化学弱化两个方面。Relying on a railway tunnel going across the stratum of N_(2) laterite,the basic physical properties of N_(2) laterite were analyzed.By means of compression deformation and shear strength tests,the water stability thereof was studied so as to reveal the change law of its deformation and strength characteristics before and after water immersion.The water variation mechanism of N_(2) laterite was analyzed by means of grain size analysis,X-RAY diffraction analysis and scanning electron microscope.The result shows that water is the most important factor leading to the change of physical and mechanical properties of N_(2) laterite,and the mechanism of water stability is presented by physical weakening and chemical weakening mainly.

关 键 词：N_(2)红黏土 物理力学性质 水稳性机理 粒度 矿物成分 微结构 软化 

分 类 号：P642.132[天文地球—工程地质学]