三峡库区典型泥岩边坡风化特性现场监测分析  

In-situ Monitoring Analysis of Weathering Characteristics of Typical Mudstone Slope in Three Gorges Reservoir Area

作　　者：陈鑫[1] 唐红梅[1] 

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《重庆师范大学学报（自然科学版）》2014年第2期23-27,F0002,共6页Journal of Chongqing Normal University:Natural Science

基　　金：国家自然科学基金(No.51378521);2013年重庆高校创新团队建设计划资助项目(No.KJTD201305)

摘　　要：泥岩边坡暴露地表具有易风化特点,分析其中的风化规律对边坡防治工程具有重要的现实意义。以三峡库区的重庆地区典型紫红色泥岩边坡为研究对象,制定原泥岩边坡的监测方案,在坡肩和坡角布设了6个原位监测点,获取了较丰富的原始数据。结果表明,风化年平均厚度可达8.1 cm,紫红色泥岩正常风化速度最大达每月0.82 cm,最小为每月0.23 cm。这些风化剥落特性与外部季节变化、降雨频次以及岩体的完整性等影响相关性明显——夏季昼夜温差大、降雨频次高,全年中风化发展最快;降雨越少的季节,风化发展越缓慢;边度的坡肩风化裂纹更突出,坡脚的风化剥落厚度更大。The mudstone exposed to the earth surface is easy weathering, so it is vital to study the weathering law for the prevention and control engineering. By selecting the amaranth mudstone in Chongqing region, formulating the monitoring plans for the original mudstone slope, 6 in situ monitoring points has been set in the slope shoulder and the slope toe and has obtained a rich original data. It is shown that the slope shoulder＇ s weathering crack is extremely obvious, and accumulation body thickness in the slope toe is greater, even whose average weathering thickness can be up to 8. 1 cm per year. Also the maximum weathering velocity of mud- stone is 0. 82 em per month, and its minimum weathering rate is 0. 23 em per month. The weathering characteristics are obviously influenced by the change of temperature, rainfall frequency and the integrity of rock mass. In summer, there is a large temperature difference between day and night, a high frequency rainfall and the fastest weathering rate in a year. In the less rainfall season, the weathering rate develops slowly. The more serious the slope shoulder＇ s weathering crack is, the larger the thickness of weathering flake in the slope toe is. The research result has positive significant to prevent and control weathering disasters of mudstone slope.

关 键 词：泥岩风化 原位监测 风化速度 三峡库区 

分 类 号：P642.24[天文地球—工程地质学]