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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 exposed surface of mudstone slope has the characteristics of easy weathering, and the analysis of the weathering rules has an important practical significance for slope prevention and control engineering. Taking the typical magenta mudstone slope in Chongqing area of the Three Gorges Reservoir area as the research object, a monitoring program of the original mudstone slope was established. Six in situ monitoring points were set up on the slope shoulder and the slope angle, and abundant original data were obtained. The results show that the annual average thickness of weathering is up to 8.1 cm, the normal weathering rate of magenta mudstone is up to 0.82 cm per month and the minimum is 0.23 cm per month. These weathered spalling characteristics have obvious correlation with external season changes, rainfall frequency and the integrity of rock mass. The temperature difference between day and night in summer is large, the rainfall frequency is high, and the weather is developing fastest in the whole year. In the season with less rainfall, the weathering develops Slow; edge of the slope more prominent weathering cracks, slope foot weathered flaking greater thickness.