四川盆地红层岩体质量劣化特征及其保护措施研究

Study on the Quality Deterioration Characteristics and Protection Measures of Red Bed Rock Mass in Sichuan Basin

四川盆地红层是一套最为典型的红层,具有强度低、易遇水软化和快速风化等特有工程特性,存在岩体大变形和难支护等问题,严重制约着工程的建设。本文以四川盆地10余个红层地区水电水利工程为基础,研究了四川盆地红层的分布和沉积建造规律及其物质组成,从红层岩体快速风化和水致劣化角度分析了红层岩体质量劣化特征,在此基础上,提出了基于红层快速风化、水致劣化特性的“防渗排水-预留开挖-加固封闭”快速保护措施。

The red bed in Sichuan Basin is the most typical one,which has special engineering characteristics such as low strength,water softening and rapid weathering.There are problems such as large deformation of rock mass and difficult support,which seriously restrict the construction of the project.Based on more than 10 hydropower and water conservancy projects in red bed areas in Sichuan Basin,this paper studies the distribution,sedimentary formation law and material composition of red bed in Sichuan Basin,and analyzes the quality deterioration characteristics of red bed rock mass from the perspective of rapid weathering and watered deterioration.Based on such characteristics,the rapid protection measures of"seepage proofing and drainage,reserved excavation,and reinforced sealing"are put forward.