论文部分内容阅读
基于损伤弱化与摩擦强化的思想,利用弹簧、胶结杆、滑片组成细观子链D,并引入剪切带宽度,建立了摩擦局部化损伤本构关系.在本构关系的应力-应变曲线上,随剪切带宽度的增加,硬化模量和峰值强度降低.对比已有的应变梯度理论发现,在细观层次上局部化失稳表现为剪切滑动旋转机制,摩擦滑动效应与已有的应变梯度效应具有物理等效性.各种加载条件下的应力-应变曲线形态表明,局部化带宽度的变化对应了各种通过作用于微观键而影响岩石力学性质因素的变化,如温度、加载速率、颗粒尺寸、气体在岩石内表面的吸附作用等.因此,摩擦局部化损伤本构关系适用于更为复杂的工程地质条件.
Based on the idea of damage reduction and friction strengthening, the constitutive relation of friction localized damage is established by using microstructure sub-chain D composed of spring, cementing rod and vane, and introducing the shear band width. In the stress-strain curve , The shear modulus and the peak strength decrease with the increase of the shear band width.Comparing with the existing strain gradient theory, it is found that the localized instability at the mesoscopic level is the shear-slip rotation mechanism and the friction-slip effect is similar to the existing The strain-gradient curves under various loading conditions show that the variation of the localized bandwidth corresponds to the changes of various factors that affect the mechanical properties of the rock through the action of micro-bonds, such as temperature, Loading rate, particle size, gas adsorption on the inner surface of the rock, etc. Therefore, the friction localized damage constitutive relation is suitable for more complicated engineering geological conditions.