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以白云鄂博露天铁矿东矿岩质高边坡为工程背景,结合现场地质调查、室内岩石和节理力学试验等数据,采用等效岩体技术,构建能充分反映节理分布特征的实验室、现场原位试验和工程尺度等多尺度等效岩体模型。通过对各类等效岩体模型进行单轴压缩试验,研究岩体单轴抗压强度、弹性模量等力学特性的尺寸效应和各向异性。研究表明:节理的存在使岩体表现出尺寸效应和各向异性,且随着尺寸的增大,这种特性基本呈逐渐减弱的趋势;研究区域岩体的表征单元体积、单轴抗压强度和弹性模量分别为20 m×10 m×10 m、1.46 MPa和3.91 GPa;岩体单轴抗压强度、弹性模量与轴向尺寸的关系,近似符合渐进式指数函数关系,且该函数能直观地给出工程尺度岩体的力学特性。
Taking the rocky high slope of East Mine of Baiyunebo open-pit iron mine as the engineering background, the equivalent rock mass technique was used in combination with the data of on-site geological survey, laboratory rock and joint mechanics test to construct a laboratory which can fully reflect the distribution of joints. In-situ test and engineering scale and other multi-scale equivalent rock mass model. Through uniaxial compression tests on various types of equivalent rock mass model, the size effect and anisotropy of mechanical properties such as uniaxial compressive strength and elastic modulus of rock mass are studied. The results show that the existence of joints makes the rock mass show the size effect and anisotropy, and the size of the rock mass decreases gradually as the size increases. The volume of the unit rock, the uniaxial compressive strength And elastic modulus are 20 m × 10 m × 10 m, 1.46 MPa and 3.91 GPa, respectively. The uniaxial compressive strength, elastic modulus and axial dimension of rock mass approximate the relationship of asymptotic exponential function, and the function The mechanical properties of engineering rock mass can be directly given.