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水泥、石灰等碱性物质被大量用于加固土工结构,然而碱性材料已经给红土造成了长期的侵蚀。基于材料互损的化学分析,设计了红土坝料的加速劣化浸泡,对比试验了水工指标,分析了渗水的离子浓度变化。检测证实:碱性物质降低了倍半氧化物的聚合力、消耗了红土的黏结成分、劣化了结构材料的颗粒级配。揭示了碱性加固材料与酸性坝土的相互作用及接触带互损渗漏机制,提出材料互损是导致土坝重要指标逐渐劣化、细观渗流通道增加扩大、加固效益太低的重要原因之一。
Alkaline materials such as cement and lime are used in a large amount to reinforce geotechnical structures, whereas alkaline materials have caused long-term erosion of laterite. Based on the chemical analysis of material loss, the accelerated dipping and soaking of laterite dams were designed, the hydraulic indexes were compared and the changes of ion concentration in seepage water were analyzed. Tests confirmed that alkaline substances reduce the polymerization power of sesquioxide, consume the red clay bonding components, and deteriorate the particle size distribution of the structural material. The interaction between alkaline reinforced concrete and acid dam and the mechanism of reciprocal loss of contact zone are revealed. It is suggested that the mutual loss of materials is the important reason that the important index of earth dam is gradually deteriorated, the mesoscopic seepage channel increases and expands, and the reinforcement effectiveness is too low one.