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温度与动水压力作用下灰岩微观溶蚀的定性分析
引用本文:刘 琦,卢耀如,张凤娥,齐继祥,张 胜.温度与动水压力作用下灰岩微观溶蚀的定性分析[J].岩土力学,2010,31(Z2):149-154.
作者姓名:刘 琦  卢耀如  张凤娥  齐继祥  张 胜
作者单位:1. 同济大学 地下建筑与工程系,上海 200092;2. 中国地质科学院 水文地质环境地质研究所,石家庄 050061; 3. 贵州师范大学 中国南方喀斯特研究院,贵阳 550001
基金项目:“十一五”国家科技支撑计划重大项目(No. 2006BAC01A09);国家自然科学基金资助项目(No. 40772150;No. 40572144)。
摘    要:通过扫描电镜和压汞试验,对不同温度和动水压力条件下,CO2水溶液溶蚀前后的灰岩微观结构进行研究,定性分析并探讨溶蚀作用的微观机制。首先,灰岩的溶蚀作用受岩性和结构控制,相同条件下微晶灰岩溶蚀速度和溶蚀量比鲕粒灰岩小;其次,温度和动水压力的影响较显著,动水压力高使得岩样表面的孔隙、裂隙增多并加深,析出的晶体大小悬殊,多为不规则的他形,温度升高会加剧溶蚀和结晶作用,使结晶体粗大且晶形完好。另外,灰岩在发生表面溶蚀的同时还发生孔隙结构特征改变,孔隙结构变得不均匀、不连续化,产生次生孔隙和次生矿物,受动水压力影响,灰岩的渗透性降低,结构面的连接会弱化。这些微观溶蚀特征也很好地记载了溶蚀作用过程中的信息及其结果。

关 键 词:扫描电镜  压汞试验  微观溶蚀作用  温度  动水压力
收稿时间:2010-06-11

Qualitative analysis of microcorrosion of limestone induced by temperature and hydrodynamic pressure
LIU Qi,LU Yao-ru,ZHANG Feng-e,QI Ji-xiang,ZHANG Sheng.Qualitative analysis of microcorrosion of limestone induced by temperature and hydrodynamic pressure[J].Rock and Soil Mechanics,2010,31(Z2):149-154.
Authors:LIU Qi  LU Yao-ru  ZHANG Feng-e  QI Ji-xiang  ZHANG Sheng
Affiliation:1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China; 3. Institute of South China Karst, Guizhou Normal University, Guiyang 550001, China
Abstract:Qualitative analysis of microcosmic mechanism of limestone dissolution driven by different temperatures and hydrodynamic pressure in CO2-H2O solutions are scanned by the environmental scanning electron microscope (SEM) before and after the mercury injection test. First, the limestone dissolution is influenced by temperature and water pressure besides lithology and structure, dissolution of micrite small than oolitic limestone under the same conditions. Secondly, the sample produced different magnitude irregular figure crystal under high hydrodynamic pressure, the increase and extension of pores and fissures. And that produced great magnitude regular figure crystal by rising temperature that the dissolution and deposition are increased. The dissolution not only affects on the surface of the rock produce secondary pore and secondary mineral, but also influences the inner pore structure; the pore structure became inhomogeneous and discontinuous, decreases the permeability and connection among the structural planes of rocks. These microscopic characters are also well documented the information and results of the dissolution process.
Keywords:SEM  mercury injection test  microcorrosion  temperature  hydrodynamic pressure
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