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中文摘要：
以云南省富民县某典型路基边坡为例,采用铸体薄片鉴定、岩石全分析和电子扫描电镜等分析测试方法,研究岩石结构体岩石学、矿物学及微观结构特征,并据此对该边坡化学风化机理进行探讨。试验结果表明：岩石为碳酸盐化钙质基性沉凝灰岩,经历溶解、水解、氧化等多种水岩化学作用后,岩石微观结构疏松、孔隙发育;腐岩壳与核心石存在明显界线并发育微裂纹。由此可以得出：化学风化的实质为侵蚀性地下水与岩石造岩矿物之间发生化学作用并造成岩石结构体损伤;相对实验室条件,天然斜坡水岩化学作用机理复杂并涉及诸多科学问题;水岩化学作用诱发斜坡失稳,孕育不良地质现象,促进斜坡夷平和地貌重塑,推动全球气候演化,参与成矿作用,对其研究具有重要的科学意义。
英文摘要：
Taking a typical roadbed slope in Fumin of Kunming as a case,some analysis test methods,such as casting thin sections,chemical analysis and scanning electron microscopy,are used to analyze the petrologic features,mineralogical and microstructure characteristics of the rock blocks.Then chemical weathering mechanisms of the slope are discussed.Results show that rock sample is carbonatic calcareous basic sedimentary tuff.The microstructure becomes loosen and pore developes after undergoing dissolution,hydrolysis,oxidation and so on.A clear dividing line can be found and microcracks develope in transitional region between core stone and saprolized crust of rock samples in microscopic scale.Conclusions can be obtained that the essence of chemical weathering is chemical interactions between erosive groundwater and rock-forming minerals,which cause rock damage.Compared with laboratory conditions,the mechanisms of chemical water-rock interactions on natural slope are more complex and with more scientific problems.Chemical water-rock interactions induce instability of slope,gestate harmful geological phenomenon,accelerate slope deplanation and physiognomy remodeling,promote global climate evolution,participate in mineralization.So it is of important scientific significance to research it.
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