甘肃曲溪地区混合岩化片岩变形特征参数试验研究

Experimental study on deformation characteristic parameters of migmatized schist in Quxi area of Gansu Province

混合岩化片岩具有各项异性的工程力学特征,通过现场混合岩化片岩刚性承压板法试验,获得了甘肃曲溪地区混合岩化片岩的变形参数,其中微风化混合岩化片岩的弹性参数E_S=12.60GPa、E_0=7.78GPa,弱风化—微风化的混合岩化片岩的弹性参数E_S=1.67GPa、E_0=0.89GPa。研究结果表明:研究区混合岩化片岩的变形,主要是由于其内部孔隙和层理受压所致的压缩形变,变形范围在规范界限之内,满足混凝土重力坝的建设条件。研究结果可为岩体变形特性理论研究与工程应用提供参考。

The Migmatized schist has the anisotropy engineering mechanical properties. The deformation parameters of the migmatized schist in Quxi area of Gansu Province are obtained through the field rigid bearing plate tests. The elastic parameters of the slightly weathered migmatized schist is ES= 12. 60 GPa、E0= 7. 78 GPa,and the elastic parameters of the weak-moderate weathered migmatized schist of is ES=1. 67 GPa,E0= 0. 89 GPa. The results show that the deformation of the migmatized schist in study area is mainly due to the compress deformation of the structural fractures and the pressured bedding. The deformation range is within the specification limits,and the proposed site meets the construction conditions of concrete gravity dam,which could provide the reference for theoretical study and engineering application of rock mass deformation characteristics.