黄土坡临江1^#滑坡滑带土的淋溶试验研究  

Study on the Leaching Test of the Sliding Zone Soil of Huangtupo Riverside 1^# Landslide

作　　者：何晨 史婷婷[1] 曾雯[1] 林国华 连志鹏 HE Chen;SHI Tingting;ZENG Wen;LIN Guohua;LIAN Zhipeng(Three Gorges Research Center for Geo-hazard,Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China;Wuhan Center of Geological Survey,China GeologicalSurvey (Central South China Innovation Center for Geosciences),Wuhan 430205,China)

机构地区：[1]中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心,湖北武汉430074 [2]中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉430205

出　　处：《安全与环境工程》2020年第4期53-60,共8页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41602058);水利部三峡后续防治规划项目(0001212019C C60 012)。

摘　　要：为研究酸雨淋溶作用下滑坡滑带土水-岩(土)化学作用过程对黄土坡滑坡稳定性的影响,选取长江三峡库区黄土坡临江1^#滑坡主滑带土为研究对象,设计不同pH值酸性溶液土柱淋溶试验,分析黄土坡临江1^#滑坡主滑带土中主要元素在不同pH值条件下的溶出特征和释放规律,并探讨该滑坡滑带土在淋溶过程中发生的主要水文地球化学反应。试验结果表明:pH值影响着对该滑坡稳定性起重要作用的钙质胶结物的溶解和黏土矿物的生成,且在淋溶试验选取的溶液pH值范围(3~7)内,随着pH值的减小,钙质胶结物溶解量增加、离子交换作用增强,使得土体成分流失、孔隙增大,不利于滑坡体稳定。为从微观角度了解酸雨频发地区滑坡的演化机制并提出针对性防治措施提供参考。In order to discuss the water-rock(soil)chemical interaction in the landslide of acid rain leaching and the influence of this process on the stability of Huangtupo landslide,this paper selects the sliding zone soil of Huangtupo riverside 1^#landslide as the research object,designs soil column leaching tests with different pH acidic solutions,analyzes the dissolution characteristics and release rules of the main elements in the main sliding zone under different pH value conditions,and explores the main hydrogeochemistry reactions of the sliding zone soil during the leaching process.The results show that pH value affects the dissolution of calcium cement and the formation of clay minerals which play an important role in the stability of landslide.In the pH range of leacheate(3—7),with the decrease of pH value,the dissolution of calcium cement increases and the ion exchange increases,which causes the loss of soil components and the increase of pores,which is not conducive to the stability of landslide mass.The research provides reference for understanding the evolution mechanism of landslides in the areas with frequent acid rain from the micro point of view and puts forward corresponding prevention and control measures.

关 键 词：酸雨 黄土坡滑坡稳定性 滑带土 淋溶试验 pH值 水-岩(土)化学作用 

分 类 号：X4[环境科学与工程—灾害防治] TU43[建筑科学—岩土工程]