Li Xinwei, Yao Zhishu, Huang Xianwen, Liu Xiaohu, Fang Yu, Xu Yongjie
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China.
School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Materials (Basel). 2022 Sep 2;15(17):6116. doi: 10.3390/ma15176116.
Affected by fracture distribution, sandstone shows different deformation and energy evolution characteristics under cyclic loading and unloading conditions. Therefore, uniaxial cyclic loading tests were conducted on fractured sandstone with different angles. The deformation characteristics and the evolution law of energy indexes with the peak load and crack angles were obtained under cyclic loading. Studies have shown that: The deformation modulus of sandstone first increases and then decreases, and the lateral expansion coefficient is positively correlated with the peak load. Based on the viscoelastic deformation theory, an energy analysis model considering damping energy and damage energy is established. The dissipated energy can be divided into the damping energy consumed to overcome rock viscoelasticity and damage energy causing damage by viscoelastic deformation theory. Based on this model, the relationship between elastic property, damping energy, damage energy and fracture angle is obtained, and the damage energy increases slowly first and then rapidly. The research results provide a reference for predicting the damage and failure of rock.
受裂隙分布影响，砂岩在循环加卸载条件下呈现出不同的变形和能量演化特征。因此，对不同角度的裂隙砂岩进行了单轴循环加载试验。获得了循环加载下砂岩的变形特征以及能量指标随峰值荷载和裂隙角度的演化规律。研究表明：砂岩的变形模量先增大后减小，横向膨胀系数与峰值荷载呈正相关。基于粘弹性变形理论，建立了考虑阻尼能量和损伤能量的能量分析模型。根据粘弹性变形理论，耗散能可分为克服岩石粘弹性消耗的阻尼能量和由粘弹性变形引起损伤的损伤能量。基于该模型，得到了弹性性质、阻尼能量、损伤能量与裂隙角度之间的关系，损伤能量先缓慢增加后迅速增加。研究结果为预测岩石的损伤和破坏提供了参考。
