【摘要】 岩石裂隙的非饱和渗透特性是岩土、能源和环境等领域科学研究中的热点问题。采用三维激光扫描获取花岗岩裂隙的表面形貌特征,分析裂隙微观形貌特征对非饱和渗透特性的影响。研究在张拉、压缩、剪切等复杂荷载作用下裂隙开度分布的演化规律,建立复杂荷载作用下岩石裂隙非饱和毛细压力曲线演化模型。基于裂隙的微观形貌特征推导了岩石裂隙非饱和相对渗透系数模型,通过与试验数据对比,验证了模型的准确性和有效性,并在此基础上建立了复杂荷载作用下岩石裂隙非饱和相对渗透系数演化模型。研究成果对非饱和条件下裂隙岩体的水-力耦合机制研究具有一定指导意义。更多还原

【Abstract】 Unsaturated hydraulic properties of rock fractures have been widely studied in geotechnical,energy and environmental engineering.In this study,the three-dimensional laser scanning testing is used to obtain the morphology properties of a granite fracture;and then the influences of morphology properties on the unsaturated hydraulic properties are analyzed.By analyzing the variation of aperture distribution under various stresses including tensile stress,compressive stress,shear stress,a model is established to describe the relationships between capillary pressure and saturation of rock fractures under complex loading.A relative permeability model for unsaturated fractures is developed based on the analysis of the surface microcosmic features.The model is verified by experimental data subsequently.Finally,a variational relative permeability model for unsaturated fractures is established.This work is helpful for the research on hydro-mechanical coupling mechanism of unsaturated fractured rock masses.更多还原