【摘要】 为了探究层理性页岩在不同层理条件下的力学性质，以四川盆地龙马溪组页岩为研究对象，基于岩石破裂过程分析系统RFPA^2D数值模拟软件，模拟了在不同层理密度、层理角度的情况下，页岩的抗压强度、弹性模量、泊松比、抗张强度和断裂韧性的变化。随着页岩层理密度的增大，抗压强度、弹性模量、抗张强度和断裂韧性均出现不同程度减小，而泊松比呈现增大趋势；在层理密度不变的条件下，随着层理角度的增加，页岩的抗压强度、弹性模量、抗张强度和断裂韧性均呈现先减小再增大的趋势，而泊松比则先增加后减小。其中，抗压强度和弹性模量在层理角度约40°时出现最小值，抗张强度在层理角度约20°时出现最小值，断裂韧性在层理角度约30°时出现最小值。研究结果表明：层理密度、层理角度均对页岩的破坏形式和力学性质具有显著影响，且随着层理条件的改变，页岩的抗压强度、抗张强度、弹性模量和断裂韧性变化趋势相同，泊松比变化趋势则相反。更多还原

【Abstract】 To explore layered shale’s mechanical properties under different bedding conditions,taking the Longmaxi Formation shale in Sichuan Basin as the research object,based on the numerical simulation software of analysis system of rock fracture process(RFPA^2D),the changes of compressive strength,elastic modulus,Poisson’s ratio,tensile strength and fracture toughness of shale under different bedding densities and bedding angles were simulated.With the increase of shale laminar density,the compressive strength,elastic modulus,tensile strength,and fracture toughness are reduced to different degrees,while Poisson’s ratio shows an increasing trend.Under the condition of constant laminar density,with the increase of bedding angle,the compressive strength,elastic modulus,tensile strength,and fracture toughness of shale show a trend of decreasing and then increasing.In contrast,the Poisson’s ratio increases first and then decreases.Among them,the minimum values of compressive strength and elastic modulus appeared when the bedding angle was about 40°，the minimum value of tensile strength appeared when the bedding angle was about 20°，and the minimum value of fracture toughness appeared when the bedding angle was about 30°.The results show that the bedding density and the bedding angle have a significant effect on the damage form and mechanical properties of the shale,and with the change of bedding conditions,the compressive strength,tensile strength,elastic modulus,and fracture toughness of the shale have the similar change trend,while the Poisson’s ratio changes in reverse.更多还原