砂页岩中泥化夹层的工程地质特性分析

Analysis of the Engineering Geological Characteristics of the Argillation Intermediate Layer in Sandstone and Shale

针对我国华北地区分布广泛的砂页岩中存在不特定发育的泥化夹层,当作为建筑物地基时,存在软弱、变形量大、抗剪强度低等问题,文中依据多个大中型工程的地质勘察成果,在大量现场试验和室内试验资料的基础上,深入分析了泥化夹层的特点、成因、膨胀性和抗剪性能;对工程建筑物地基中有可能出现泥化夹层时,提出了在砂页岩地区进行工程地质勘察应该注意的事项和工程处理措施,以期为今后在砂页岩中建设的工程项目提供借鉴。

For the widely existing sandstone and shale areas in North Chi na,one of the main engineering geological problems is the existance of no n-specifially developed argillati on intermediate layer in the rock stratum.When it is used as the foundations of buildings,ther e exist several problems like weakness,large deformation,and low shear strength,which affect the foundation stability.According to the geological survey results of many large and medium-sized projects,and on the basif of a number of field test and in door test data,this paper gave in-depth analysis of the characteristics,the cause of f ormation,expansion,and shear resistance properties of the argillation intermediate layer.For the building foundation with argillation intermediate layer,some announcements and engineering measures were put forward to the engi neering geological investigation in the sandstone and shale areas.It provides a reference for construction projects in the sandstone and shale area in the future.