水-岩作用下赵树岭滑坡松散岩土体细观结构演化的SEM测试分析  

SEM Test Analysis on Loose Rock-soil Mini-structure in Zhaoshuling Slope under the Condition of Water-rock Interaction

作　　者：刘镇[1] 唐朝晖[1] 彭兰 梁合诚[3,4] 单慧媚[3] 

机构地区：[1]中国地质大学工程学院,武汉430074 [2]湖北瑞达路桥工程质量检测有限公司,武汉430056 [3]中国地质大学环境学院,武汉430074 [4]中国地质大学生物地质与环境地质教育部重点实验室,武汉430074

出　　处：《安全与环境工程》2009年第2期1-4,共4页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(40702059);湖北省自然科学基金项目(2007ABA148)资助

摘　　要：以三峡库区典型滑坡——赵树岭滑坡为例,采取滑坡堆积体中松散岩土体试样和库水试样在室内进行水-岩相互作用试验,在不同饱水时间下对溶液进行离子测试和松散岩土体扫描电镜(SEM)测试,根据测试结果分析库水中离子浓度的变化和松散岩土体的细观结构变化过程。研究结果表明:松散岩土体与库水的相互作用主要有离子交换、溶蚀、吸附作用;水-岩相互作用对土样细观结构存在影响,且随着饱水时间的增长,松散岩土体试样的结构由斑块状结构向絮状结构、凝块状结构发展,出现溶洞式架空孔隙,孔隙度明显增大,团粒化程度不断降低,最终导致结构强度的降低。The studies on geo-hazards in the area of the Three Gorges reservoir rarely take the water-rock interaction into account currently as a factor in the development of geo-hazards. As a typical example,the mini-structure of loose rock-soil sampled in the accumulation body of Zhaoshuling slope was studied on the basis of scanning electron microscope （SEM） photos with the amplification of 1500 times and the result of ion-test under the condition of water-rock interaction,via the simulation experiments in the laboratory. The study shows that the influence of water-rock interaction to soil mini-structure does exist, the interaction between water and loose rock-soil is mainly the action of ion exchange, corrosion and adsorption, and the soil mini-structure turns from plaque-like structure into flocculent structure as the saturation time increases, during which the overhead pores of karst cave occur, the porosity increases obviously,and the degree of cluster granulation decreases, which will cause the final decrease of structure strength.

关 键 词：水-岩相互作用 赵树岭滑坡 细观结构 SEM 

分 类 号：X4[环境科学与工程—灾害防治] TU411.92[建筑科学—岩土工程]