红层地区软弱夹层地质问题研究  

Study on weak intercalation in "red layer" area

作　　者：曾锋[1] 彭静[1] 

机构地区：[1]水利部长江勘测技术研究所,湖北武汉430011

出　　处：《人民长江》2011年第22期15-17,共3页Yangtze River

摘　　要：为了研究软弱夹层对水电工程的影响程度及其工程性质,结合嘉陵江亭子口水利枢纽及德阳市华强沟水库的工程实例,分析了白垩系下统泥质粉砂岩与黏土岩、夹砂岩及砾岩的软硬相间红层地层软弱夹层的成因类型与形成机理、物质组成与结构特征及物理力学性质。结果表明:软弱地层强度与黏土矿物颗粒组成、矿物成分、活动性及颗粒比表面积有关;上下岩层接触面的起伏度和粗糙度对强度影响明显;抗剪强度随充填物厚度增加而降低。In order to study the engineering property of weak intercalation and its influence on projects,the Tingzikou Hydropower Station on the Jialing River and Huaqianggou Reservoir in Deyang City are taken as examples to analyze the types of causes and formation mechanism,composition,structural feature and physical-mechanical characteristics of soft-hard alternation intercalation of argillaceous siltstone,argillite rock,sandstone and conglomerate in lower series of Cretaceous system in ＂red layer＂ area.The results show that the strength of weak intercalation is associated with particle composition,mineral composition,activity and specific surface area;the interface waviness and roughness of upper and lower layers affect the strength obviously;the shear strength reduces with the increase of thickness of filling materials.

关 键 词：软弱夹层 形成机理 结构特征 物理力学性质 亭子口水利枢纽 华强沟水库 

分 类 号：P642[天文地球—工程地质学]