【摘要】 结合山体滑坡和油田开采等工程问题,大量测定和研究了若干完整的和含弱面的岩石的力学参数和破坏特性.结果表明,围压(对应于地下深度)对地壳浅表岩石力学行为的影响已不可忽视,因此,上述工程问题都应给予考虑.这种影响表现为随围压(深度)的增加不仅强度增加,而且破裂性质由张性迅速向张剪性过渡,岩石由脆性向半脆性、半延性过渡,破裂由单一面向破裂带过渡;随围压(深度)的增加,弱面影响逐渐减弱,从而导致杨氏模量的增加.研究还表明,岩体周围介质的特性对岩体破坏行为有明显影响,随着周围介质刚性增加和流动性减小,岩石明显地表现出由突发式破坏向渐进式破坏过渡.更多还原

【Abstract】 For engineering purposes such as landslide prediction and some problems in oil field,we measuredmachanical parameters and studied fracture characteristics of intact and naturally—cracked specimens.Theexperimental results shows that mechanical behavior of rocks varies strikingly with increasing confiningpressure.So we must take influence of dapth into consideration.The influences arc as follows:With in-creasing confining pressure,strength increases and fracture properties transit from tension—dominentmode to tension—shear mixed mode,and influence of crack becomes less evident,resulting in high modulusof deformation.The result also showes that environmental stiffness has apparent effect on the fracture behavior,witha stiffer environmental medium,fracture property transit from abrupt instability to gradual fracture pro-cess.更多还原