论文部分内容阅读
从能量角度出发,分析了脆性岩石的整个变形破坏过程。列举出岩石破坏过程的各种能量类型并对其分类,通过分析机械能和热能在岩石破坏过程中的不同影响,提出了用能量法分析岩石破坏过程必须区分热能与机械能。根据循环加、卸载曲线讨论了在岩石变形破坏的不同阶段输入的机械能?W与可释放应变能增量e?U以及耗散能增量d?U之间的关系及变化规律。分析了应力脆性跌落系数存在的不足,提出了一个新的表征岩石破坏的参量,即脆性岩石的能量跌落系数。对不同围压下大理岩和花岗岩破坏过程的应力-应变曲线分析计算,得到了能量跌落系数与围压的关系,以及损伤程度和泊松比对其影响。并通过与现有的应力脆性跌落系数进行对比,说明了本模型的合理性,并认为用其描述岩石的脆性程度在更广泛的围压条件下的适用性。
From the energy point of view, the entire deformation and failure process of brittle rocks are analyzed. The various energy types of the rock failure process are listed and classified. By analyzing the different influences of mechanical energy and heat energy on the rock failure process, it is proposed that the energy method must be used to distinguish the thermal energy from the mechanical energy when analyzing the rock failure process. According to the cyclic loading and unloading curves, the relationship between the mechanical energy? W and the increment of the released strain energy e? U and the increment of the dissipation energy d? U at different stages of rock deformation and failure are discussed. The shortcomings of the brittle rock drop were analyzed, and a new parameter to characterize rock failure was proposed, namely the energy drop coefficient of brittle rock. The stress-strain curves of the marble and granite under different confining pressure are analyzed and calculated. The relationship between the energy drop coefficient and the confining pressure is obtained, and the influence of the damage degree and Poisson’s ratio is also analyzed. By comparing with the existing brittle stress drop coefficient, the model is reasonable and it is considered that the brittleness of the rock can be used to describe the applicability of the rock under wider confining pressure conditions.