全风化玄武岩防渗料可行性试验研究

为高质高量解决水利水电工程土石坝防渗料的就地取材问题,结合杉树堡水库工程,开展了全风化玄武岩作为土石坝防渗土料的可行性试验研究。根据全风化玄武岩分布特征和性质,结合相关技术规范,通过对风化土料的物理力学性质及渗透性质,进行试验研究。研究表明:全风玄武岩土料为高液限含砾粉质黏土,无膨胀性;其有机质和水溶盐含量符合心墙坝防渗土料质量技术要求;风化土料压实后,最大干密度较低、最优含水率高、压缩系数较低、压缩模量较高,渗透系数和抗剪强度满足规范对防渗料要求,可以作为土石坝防渗料。

Experimental Research on Feasibility of Impervious Material of Fully Weathered Basalt

To solve the problem of impervious material locally used in hydraulic-power engineering in a highquality way, experimental research was carried out to verify the feasibility of impervious material of fully weathered basalt used in Shashubao Reservoir. In accordance with distribution characteristics and properties of fully weathered basalt, experimental research mainly included physical and mechanical properties and osmosis properties. Research shows that earth material of fully weathered basalt is high liquid limit gravel silty clay without expansibility, whose content of organic matter and water soluble salt meets the quality requirements of impervious material in core dam engineering. It can be used as impervious material for fully weathered basalt has good compressibility of low maximum dry density, and high optimum moisture content.