为分析千枚岩的基本岩性、研究千枚岩的变形和强度特征,对千枚岩进行单轴压缩试验,并通过数值模拟揭示千枚岩破坏机理.制备千枚岩试样在位移加载条件下进行单轴压缩试验,分析千枚岩的力学特性,获取弹性模量等参数后通过 PFC3D进行数值模拟,揭示强度和破坏的内在联系.研究表明,千枚岩强度范围区间较大;千枚岩单轴加载后破坏形式主要为竖向拉伸破坏和 Y 型剪切破坏,有少量的 X 状斜面剪切破坏;千枚岩峰值应力计算后范围在70～105 MPa区间内不等,岩石单轴压缩试验符合弹性模量越大,峰值应力越大,对应应力-应变曲线越陡峭,脆性特征越明显这一规律;经PFC3D数值模拟和实验对比,弹性模量和峰值强度数值吻合度高,裂隙扩展形态几乎相同.
Study on Mechanical Properties and Failure Characteristics of Phyllite
In order to analyze the basic lithology of phyllite and study the deformation and strength characteristics of phyllite,uniaxial compression tests were carried out to reveal the failure mechanism of phyllite through numerical simulation.The prepared phyllite specimen was subjected to uniaxial com-pression test under displacement loading,and the mechanical properties of phyllite were analyzed to ob-tain the elastic modulus and other parameters,and then numerical simulation was carried out by PFC3D to reveal the internal relationship between strength and failure.The results show that the phyllite strength range in this study is large;The failure modes of phyllite under uniaxial loading are mainly ver-tical tensile failure and Y-shear failure,with a small amount of X-slope shear failure.The calculated peak stress of phyllitic rock ranges from 70～105 MPa.The uniaxial compression test of rock conforms to the law that the greater the elastic modulus,the greater the peak stress,the steeper the correspond-ing stress-strain curve,and the more obvious the brittleness characteristics.Through PFC3D numerical simulation and experimental comparison,it is found that the numerical values of elastic modulus and peak strength are in good agreement,and the fracture expansion pattern is almost the same.
rock mechanicsphylliteuniaxial compression testingnumerical simulation
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