沉积型软弱夹层成因分类及强度特征  

Strength characteristics with genesis and type of the sedimentary weak intercalated layers

作　　者：胡涛[1] 任光明[1] 聂德新[1] 唐良琴[1] 向贵府[1] 

机构地区：[1]成都理工大学环境与土木工程学院,四川成都610059

出　　处：《中国地质灾害与防治学报》2004年第1期124-128,共5页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金资助项目(40072090)

摘　　要：研究区为一沉积岩覆盖区。由于区内软弱夹层分布广泛,构成了影响坝肩、坝基抗滑稳定性的主要工程地质问题之一。文章从软弱夹层的成因入手,认为区内特定的沉积环境和构造运动是夹层形成的基础,确定了夹层的成因类型;根据夹层分布、夹泥粒度组成,依据工程分类方法,将坝区夹层分为3种不同类型:粘泥型(Ⅰ1类),泥含粉粒碎屑型(Ⅰ2类)及碎屑夹泥型(Ⅱ类);分析了区内夹层夹泥的物理性质及表征区内夹层物理性质指标;通过分析软弱夹层强度特征与其物理性质的关系,确定了能够表征夹层强度特征的物理性状指标W Wp;在软弱夹层工程分类基础上,研究各类夹层的强度特征,表明综合物理性状指标W Wp与强度指标之间具有较好的相关性,确定了不同类型夹层的W Wp和强度指标的相关关系式。在上述相关关系式基础上,结合坝区内控制性夹层的物理指标,给定了其强度建议值。文章这种"成因-物理性质-强度特征"的研究方法及以此确定的不同类型软弱夹层物理性状指标和强度指标间的相关关系,为沉积型软弱夹层的强度取值提供了一条捷径,对其它类型软弱夹层的强度取值也具一定的参考价值。Because of the wide-ranging distribution of the sedimentary rock, the weak intercalated layer is regarded as one of the primary engineering geological problems influencing on the stability against sliding of the dam abutment and the dam foundation. Based on the investigation of the forthgoers, the paper analyzing the genesis of the weak intercalated layer, considers that the formation of the weak intercalated layer is controlled by the sedimentation environment and tectonic movement in the area and confirms the genesis types of the weak intercalated layer; According to the distribution and the grain-ular, composition of the fault gouge, the authors divide the weak layers into three different types in view of the engineering principle.The article puts forward the index of the physical property\_W/Wp through researching the physical property and the mechanical property of the weak layers and the relation between them.Considering the engineering classification of the weak layers, the text writes down formulas according to the fine correlativity between the mechanical property and the physical quality index of different types of the weak interclatied layers. Finally the authors put forward the recommendable strength values of the dominating weak layers in the studied area.The investigation method of the article and the correlativity formulas take out the means of measuring the strength of the sedimentary weak layers and provide the referential value of measuring the strength of the other types of the weak layers simultaneously.

关 键 词：粘粒含量 物理性状指标 摩擦系数 强度特征 稳定性 工程地质 

分 类 号：P642.114[天文地球—工程地质学]