混合岩化片岩岩体变形参数试验研究

The experimental study on deformation parameters of migmatized schist

混合岩化片岩具有各向异性,对工程基础稳定性影响极大。为了研究曲溪地区混合岩化片岩岩体的变形特征,了解岩体的变形参数,通过现场刚性承压板法试验,获得了坝址选区内混合岩化片岩微风化带岩体的弹性参数E_S=12.60 GPa,E_0=7.78 GPa;弱—微风化带岩体的弹性参数E_S=1.67 GPa,E_0=0.89 GPa,结合试验所得的Ⅰ型、Ⅱ型、Ⅲ型三种压力(P)—变形(W_0)关系曲线,对重力坝址区混合岩化片岩体变形进行分析。坝址区内混合岩化片岩的变形,属于岩体内部孔隙和层理受压所致,且变形范围不影响混凝土重力坝的建设。

Migmatized schist rock has anisotropy,a great impact on the stability of the engineering foundation. In order to study the deformation characteristics of the migmatized schist in the Quxi area and to understand the deformation parameters of the rock mass,the elastic parameters E_S of the rock mass in the micro-weathering zone of the migmatized schist in the dam site were obtained by the onsite rigid bearing plate method,i.e. E_S= 12.60 GPa,E_0= 7.78 GPa. The parameters of weak-micro weathered migmatization schist is E_S= 1.67 GPa,E_0= 0.89 GPa. The obtained three types of pressure（ P） vs deformation（ W_0） curves type Ⅰ,type Ⅱ and Ⅲ were applied to analyze the deformation of the rock mass in the dam area. The results show that the deformation of the migmatizition schist in study area is mainly due to the compress of the structural fracture and bedding caused by the pressure while the deformation scope does not affect the concrete construction of the dam. The proposed site meets the construction conditions of concrete gravity dam.