论文部分内容阅读
通过对饱和砂岩和大理岩的循环荷载实验 ,分析了饱和岩石在循环荷载下的应力 -应变滞后回线、瞬时杨氏模量、泊松比的“X”形变化曲线 ,以及杨氏模量随应变振幅的增加而减少等滞后现象 ,并分析了施加外力的应变振幅对衰减的影响 ,认为岩石在循环荷载作用下的衰减与应变振幅成正比 ,提出的衰减b值反映了岩石在循环荷载作用下衰减的程度 .岩石的衰减和滞后存在密切的关系 ,通过饱和岩石的宏观行为 ,探讨了饱和岩石在循环荷载下的滞后和衰减现象的微观机理 ,认为孔隙流体流动在岩石的滞后和衰减中起着重要作用 ,岩石内部的颗粒接触粘合和黏滑摩擦可能是孔隙岩石在循环荷载作用下产生滞后和衰减的原因
Based on the cyclic loading experiments on saturated sandstone and marble, the “X” shape curves of saturated rock under cyclic loading, the “X” shape of instantaneous Young’s modulus and Poisson’s ratio, the Young’s modulus It is concluded that the attenuation of rocks under cyclic loading is proportional to the amplitude of the strain. The proposed attenuation b value reflects the effect of the rock under cyclic loading The attenuation of rock is closely related to the lag of the rock.The microscopic mechanism of the lag and attenuation of saturated rock under cyclic loading is discussed through the macroscopic behavior of saturated rock.It is considered that the lag and attenuation of pore fluid flow in the rock Plays an important role. Particle contact adhesion and stick-slip friction in the rock may be the reason for the lag and attenuation of the pore rock under cyclic loading